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flex-grow flex-col p-2 lg:pb-20 overflow-y-auto lg:gutter-stable [&::-webkit-scrollbar]:bg-transparent [&::-webkit-scrollbar-thumb]:bg-transparent group-hover:[&::-webkit-scrollbar]:bg-tint-subtle group-hover:[&::-webkit-scrollbar-thumb]:bg-tint-7 group-hover:[&::-webkit-scrollbar-thumb:hover]:bg-tint-8"><ul class="flex flex-col gap-y-0.5 page-no-toc:hidden sidebar-list-line:border-l border-tint-subtle"><li class="flex flex-col"><a aria-current="page" class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance text-sm hover:contrast-more:ring-1 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px font-semibold sidebar-list-line:before:w-0.5 before:bg-primary-solid text-primary-subtle sidebar-list-pill:bg-primary 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hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/building-thunderbird">Building Thunderbird<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/building-thunderbird/windows-build-prerequisites">Windows Build Prerequisites</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/building-thunderbird/linux-build-prerequisites">Linux Build Prerequisites</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/building-thunderbird/macos-build-prerequisites">macOS Build Prerequisites</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/building-thunderbird/artifact-builds">Artifact Builds</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview">Codebase Overview<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/account-configuration">Account Configuration</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/address-book">Address Book</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/chat">Chat Core<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/chat/notifications">Notifications</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/chat/message-styles">Message Styles</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/chat/keyboard-shortcuts">Keyboard shortcuts</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/chat/chat-core-protocols">Chat Core Protocols</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/chat/contacts">Contacts</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/codebase-overview/mail-front-end">Mail Front-End</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/tutorials-and-examples">Tutorials and Examples<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/tutorials-and-examples/hello-world">Hello World Example</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/tutorials-and-examples/thunderbird-live-development-videos">Thunderbird Live Development Videos</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug">Fixing a Bug<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/bug-triaging">Bug Triaging 101<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/bug-triaging/bug-status-classification">Bug Status Classicification</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/bug-triaging/bug-types">Bug Types</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/bug-triaging/garbage-collection">Garbage Collection</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/bug-triaging/narrow-the-scope">Narrow the Scope</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/using-mercurial-bookmarks">Using Mercurial Bookmarks</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/using-mercurial-queues">Using Mercurial Queues</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/lint-and-format-code">Lint and Format Code</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/using-eslint">Using ESLint to Format Javascript Code</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/try-server">Try Server</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/landing-a-patch">Landing a Patch</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/fixing-a-bug/care-and-feeding-of-the-tree">Care and Feeding of the Tree</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/testing">Testing<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/testing/running-tests">Running Tests</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/testing/adding-tests">Adding Tests</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/thunderbird-development/testing/writing-mochitest-tests">Writing Mochitest Tests</a></li></ul></div></li></ul></li><li class="flex flex-col group/page-group-item"><div class="flex items-center gap-3 px-3 z-[1] sticky -top-5 pt-6 group-first/page-group-item:-mt-5 pb-3 -mb-1.5 text-xs tracking-wide font-semibold uppercase [mask-image:linear-gradient(rgba(0,0,0,1)_70%,rgba(0,0,0,0))] bg-tint-base sidebar-filled:bg-tint-subtle theme-muted:bg-tint-subtle [html.sidebar-filled.theme-muted_&]:bg-tint-base [html.sidebar-filled.theme-bold.tint_&]:bg-tint-base [html.sidebar-default.theme-gradient_&]:bg-gradient-primary [html.sidebar-default.theme-gradient.tint_&]:bg-gradient-tint">Planning</div><ul class="flex flex-col gap-y-0.5"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/planning/roadmap">Roadmap</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/planning/android-roadmap">Android Roadmap</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/planning/standards-status">Supported Standards</a></li></ul></li><li class="flex flex-col group/page-group-item"><div class="flex items-center gap-3 px-3 z-[1] sticky -top-5 pt-6 group-first/page-group-item:-mt-5 pb-3 -mb-1.5 text-xs tracking-wide font-semibold uppercase [mask-image:linear-gradient(rgba(0,0,0,1)_70%,rgba(0,0,0,0))] bg-tint-base sidebar-filled:bg-tint-subtle theme-muted:bg-tint-subtle [html.sidebar-filled.theme-muted_&]:bg-tint-base [html.sidebar-filled.theme-bold.tint_&]:bg-tint-base [html.sidebar-default.theme-gradient_&]:bg-gradient-primary [html.sidebar-default.theme-gradient.tint_&]:bg-gradient-tint">Add-on Development</div><ul class="flex flex-col gap-y-0.5"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/about-add-ons">Introduction</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/whats-new">What's new?<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/whats-new/manifest-v3">Manifest Version 3</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/hello-world-add-on">A "Hello World" Extension Tutorial<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/hello-world-add-on/using-webextension-apis">Using WebExtension APIs</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/hello-world-add-on/using-a-background-page">Using a Background Page</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/hello-world-add-on/using-content-scripts">Using Content Scripts</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/mailextensions">A Guide to Extensions<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/mailextensions/supported-manifest-keys">Supported Manifest Keys</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/mailextensions/supported-ui-elements">Supported UI Elements</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/mailextensions/supported-webextension-api">Supported WebExtension APIs</a></li><li class="flex flex-col"><a class="flex justify-start items-center gap-3 p-1.5 pl-3 text-sm transition-colors duration-100 text-tint-strong/7 rounded-md straight-corners:rounded-none before:content-none font-normal hover:bg-tint hover:text-tint-strong" href="https://webextension-api.thunderbird.net/en/stable/">Thunderbird's WebExtension API Documentation<svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/arrow-up-right-from-square.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon size-3 mr-1 mt-1 place-self-start shrink-0 text-current transition-colors [&>path]:transition-[opacity] [&>path]:[opacity:0.40] group-hover:[&>path]:[opacity:1]"></svg></a></li><li class="flex flex-col"><a class="flex justify-start items-center gap-3 p-1.5 pl-3 text-sm transition-colors duration-100 text-tint-strong/7 rounded-md straight-corners:rounded-none before:content-none font-normal hover:bg-tint hover:text-tint-strong" href="https://github.com/thunderbird/webext-examples">Thunderbird WebExtension Examples<svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/arrow-up-right-from-square.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon size-3 mr-1 mt-1 place-self-start shrink-0 text-current transition-colors [&>path]:transition-[opacity] [&>path]:[opacity:0.40] group-hover:[&>path]:[opacity:1]"></svg></a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/mailextensions/experiments">Introducing Experiments</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/web-extension-themes">A Guide to Themes</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/community">Developer Community</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/resources">Documentation & Resources<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/resources/tips-and-tricks">Tips and Tricks</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating">Add-on Update Guides<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb128">Update for Thunderbird 128</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb115">Update for Thunderbird 115<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb115/adapt-to-changes-in-thunderbird-103-115">Adapt to Changes in Thunderbird 103-115</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb102">Update for Thunderbird 102<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb102/adapt-to-changes-in-thunderbird-92-102">Adapt to Changes in Thunderbird 92-102</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb91">Update for Thunderbird 91<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb91/changes">Adapt to Changes in Thunderbird 79-91</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb78">Update for Thunderbird 78<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb78/changes">Adapt to Changes in Thunderbird 69-78</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb68">Update for Thunderbird 68<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/tb68/changes">Adapt to Changes in Thunderbird 61-68</a></li></ul></div></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/historical-overview">How to convert legacy extensions?<span class="group relative rounded-full straight-corners:rounded-sm w-5 h-5 after:grid-area-1-1 after:absolute after:-top-1 after:grid after:-left-1 after:w-7 after:h-7 hover:bg-tint-active hover:text-current"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon grid flex-shrink-0 size-3 m-1 text-current transition-transform opacity-6 group-hover:opacity-11 contrast-more:opacity-11 rotate-0"></svg></span></a><div class="[&_ul>li]:opacity-1" style="opacity:0;height:0px;display:none"><ul class="flex flex-col gap-y-0.5 ml-5 my-2 border-tint-subtle sidebar-list-default:border-l sidebar-list-line:border-l"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/historical-overview/wrapped-to-modern">Convert wrapped WebExtensions to modern WebExtensions</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/historical-overview/legacy-to-modern">Convert legacy WebExtensions to modern WebExtensions</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/historical-overview/overlays">Convert legacy overlay extension to legacy WebExtension</a></li><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute before:inset-y-0 sidebar-list-line:rounded-l-none sidebar-list-line:before:w-px sidebar-list-default:[&+div_a]:rounded-l-none [&+div_a]:pl-5 sidebar-list-default:[&+div_a]:before:w-px" href="/add-ons/updating/historical-overview/bootstrapped">Convert legacy bootstrapped extension to legacy WebExtension</a></li></ul></div></li></ul></div></li></ul></li><li class="flex flex-col group/page-group-item"><div class="flex items-center gap-3 px-3 z-[1] sticky -top-5 pt-6 group-first/page-group-item:-mt-5 pb-3 -mb-1.5 text-xs tracking-wide font-semibold uppercase [mask-image:linear-gradient(rgba(0,0,0,1)_70%,rgba(0,0,0,0))] bg-tint-base sidebar-filled:bg-tint-subtle theme-muted:bg-tint-subtle [html.sidebar-filled.theme-muted_&]:bg-tint-base [html.sidebar-filled.theme-bold.tint_&]:bg-tint-base [html.sidebar-default.theme-gradient_&]:bg-gradient-primary [html.sidebar-default.theme-gradient.tint_&]:bg-gradient-tint">Releases</div><ul class="flex flex-col gap-y-0.5"><li class="flex flex-col"><a class="group/toclink relative transition-colors flex flex-row justify-between rounded-md straight-corners:rounded-none p-1.5 pl-3 text-balance font-normal text-sm text-tint-strong/7 hover:bg-tint-hover hover:text-tint-strong contrast-more:text-tint-strong hover:contrast-more:text-tint-strong hover:contrast-more:ring-1 hover:contrast-more:ring-tint-12 before:contents[] before:-left-px before:absolute 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sidebar-list-line:-left-px rounded-md straight-corners:rounded-none sidebar-list-line:rounded-l-none sidebar-list-pill:bg-primary [html.theme-muted.sidebar-list-pill_&]:bg-primary-hover [html.theme-gradient.sidebar-list-pill_&]:bg-primary-active contrast-more:border contrast-more:bg-primary sidebar-list-default:hidden sidebar-list-default:ml-3 contrast-more:sidebar-list-default:ml-0"></div><a href="#i-want-to-start-hacking" class="relative z-10 text-sm w-full py-1 px-3 transition-all duration-200 rounded-md straight-corners:rounded-none sidebar-list-line:rounded-l-none contrast-more:hover:ring-1 contrast-more:hover:ring-inset contrast-more:hover:ring-current text-primary-subtle hover:text-primary contrast-more:text-primary contrast-more:hover:text-primary-strong sidebar-list-line:ml-px hover:bg-primary-hover theme-muted:hover:bg-primary-active [html.sidebar-filled.theme-bold.tint_&]:hover:bg-primary-active theme-gradient:hover:bg-primary-active tint:font-semibold contrast-more:font-semibold sidebar-list-default:border-tint"><span class="">I Want to Start Hacking</span></a></li><li class="flex flex-row relative h-fit ml-3 my-0 sidebar-list-line:ml-0"><a href="#contributing-to-thunderbird" class="relative z-10 text-sm w-full py-1 px-3 transition-all duration-200 rounded-md straight-corners:rounded-none sidebar-list-line:rounded-l-none hover:bg-tint-hover theme-gradient:hover:bg-tint-12/1 hover:text-tint-strong contrast-more:hover:ring-1 contrast-more:hover:ring-inset contrast-more:hover:ring-current subitem sidebar-list-line:pl-6 opacity-8 contrast-more:opacity-11 sidebar-list-default:rounded-l-none sidebar-list-default:border-l sidebar-list-default:border-tint"><span class="">Contributing to Thunderbird</span></a></li><li class="flex flex-row relative h-fit ml-3 my-0 sidebar-list-line:ml-0"><a href="#add-on-development" class="relative z-10 text-sm w-full py-1 px-3 transition-all duration-200 rounded-md straight-corners:rounded-none sidebar-list-line:rounded-l-none hover:bg-tint-hover theme-gradient:hover:bg-tint-12/1 hover:text-tint-strong contrast-more:hover:ring-1 contrast-more:hover:ring-inset contrast-more:hover:ring-current subitem sidebar-list-line:pl-6 opacity-8 contrast-more:opacity-11 sidebar-list-default:rounded-l-none sidebar-list-default:border-l sidebar-list-default:border-tint"><span class="">Add-on Development</span></a></li><li class="flex flex-row relative h-fit mt-2"><a href="#report-bugs-and-request-features" class="relative z-10 text-sm w-full py-1 px-3 transition-all duration-200 rounded-md straight-corners:rounded-none sidebar-list-line:rounded-l-none hover:bg-tint-hover theme-gradient:hover:bg-tint-12/1 hover:text-tint-strong contrast-more:hover:ring-1 contrast-more:hover:ring-inset contrast-more:hover:ring-current"><span class="">Report Bugs and Request Features</span></a></li><li class="flex flex-row relative h-fit ml-3 my-0 sidebar-list-line:ml-0"><a href="#bugzilla" class="relative z-10 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sidebar-list-default:rounded-l-none sidebar-list-default:border-l sidebar-list-default:border-tint"><span class="">Profiling Thunderbird Performance</span></a></li><li class="flex flex-row relative h-fit ml-3 my-0 sidebar-list-line:ml-0"><a href="#thunderbird-on-github" class="relative z-10 text-sm w-full py-1 px-3 transition-all duration-200 rounded-md straight-corners:rounded-none sidebar-list-line:rounded-l-none hover:bg-tint-hover theme-gradient:hover:bg-tint-12/1 hover:text-tint-strong contrast-more:hover:ring-1 contrast-more:hover:ring-inset contrast-more:hover:ring-current subitem sidebar-list-line:pl-6 opacity-8 contrast-more:opacity-11 sidebar-list-default:rounded-l-none sidebar-list-default:border-l sidebar-list-default:border-tint"><span class="">Thunderbird on GitHub</span></a></li><li class="flex flex-row relative h-fit mt-2"><a href="#getting-plugged-into-the-community" class="relative z-10 text-sm w-full py-1 px-3 transition-all duration-200 rounded-md 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11.5H13C13.2761 11.5 13.5 11.7239 13.5 12C13.5 12.2761 13.2761 12.5 13 12.5H5C4.72386 12.5 4.5 12.2761 4.5 12ZM12.25 7.5C12.25 7.91421 12.5858 8.25 13 8.25C13.4142 8.25 13.75 7.91421 13.75 7.5V6C13.75 5.58579 13.4142 5.25 13 5.25C12.5858 5.25 12.25 5.58579 12.25 6V7.5Z" fill="currentColor"></path></svg></button><button class="p-2 first:rounded-l-full first:pl-2.5 last:rounded-r-full last:pr-2.5 hover:bg-primary-hover hover:text-primary-strong disabled:cursor-not-allowed disabled:hover:bg-inherit disabled:hover:text-inherit disabled:dark:hover:text-inherit ring-tint contrast-more:hover:ring-1 disabled:opacity-7 disabled:contrast-more:ring-0" type="button" aria-label="Yes, it was!" title="Yes, it was!"><svg width="18" height="18" viewBox="0 0 18 18" fill="none" xmlns="http://www.w3.org/2000/svg"><circle cx="9" cy="9" r="9" fill="currentColor" fill-opacity="0.2"></circle><path fill-rule="evenodd" clip-rule="evenodd" d="M5 8.25C4.58579 8.25 4.25 7.91421 4.25 7.5V6C4.25 5.58579 4.58579 5.25 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page-api-block:xl:max-2xl:group-hover/aside:flex [html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle page-api-block:xl:max-2xl:bg-transparent"><div class="" data-visual-test="removed"></div></div></aside><main class="relative min-w-0 flex-1 py-8 lg:px-12 break-anywhere page-api-block:xl:max-2xl:pr-0 page-api-block:mx-auto page-api-block:max-w-screen-2xl page-default-width page-has-toc"><header class="max-w-3xl mx-auto mb-6 space-y-3 page-api-block:ml-0"><h1 class="text-4xl font-bold flex items-center gap-4">About Thunderbird</h1></header><template id="B:1"></template><div class="flex flex-col gap-4"><div id="i-want-to-start-hacking" role="status" aria-busy="true" class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[47px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden 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[background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><div role="status" aria-busy="true" class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[35px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><div role="status" aria-busy="true" class="flex 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class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)] [animation-delay:_200ms]"></div></div></div><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md aspect-[1/1.2] w-full"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_24px_24px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] 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[background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><div role="status" aria-busy="true" class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[35px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><div id="getting-plugged-into-the-community" 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to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><div role="status" aria-busy="true" class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[35px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><div role="status" aria-busy="true" class="skeleton-paragraph"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md [height:calc(15rem-1px)] [max-width:calc(48rem-1px)] mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_48px_48px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><div id="chat" 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class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div></div><div class="flex flex-col md:flex-row mt-6 gap-2 max-w-3xl mx-auto page-api-block:ml-0 text-tint"><a class="group text-sm p-2.5 flex gap-4 flex-1 flex-row items-center pr-4 border border-tint-subtle rounded straight-corners:rounded-none hover:border-primary text-pretty md:p-4 md:text-base" href="/thunderbird-development/getting-started"><span class="flex flex-col flex-1"><span class="text-xs">Next</span><span class="text-tint-strong group-hover:text-primary line-clamp-2">Getting Started Contributing</span></span><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon hidden size-4 text-tint-subtle contrast-more:text-tint-strong group-hover:text-primary md:block"></svg></a></div><div class="mx-auto mt-6 page-api-block:ml-0 flex max-w-3xl flex-row flex-wrap items-center gap-4 text-tint contrast-more:text-tint-strong"><p class="mr-auto text-sm">Last updated <time data-visual-test="transparent" dateTime="2025-03-21T16:52:27.848Z" title="3/21/2025, 4:52:27 PM">15 days ago</time></p><div class="flex flex-col gap-3 text-sm xl:hidden"><div class="flex flex-wrap items-center gap-2"><p>Was this helpful?</p><div class="rounded-full border border-tint-subtle bg-tint-base contrast-more:border-tint-12"><div class="flex"><button class="p-2 first:rounded-l-full first:pl-2.5 last:rounded-r-full 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12.5858 8.25 13 8.25C13.4142 8.25 13.75 7.91421 13.75 7.5V6C13.75 5.58579 13.4142 5.25 13 5.25C12.5858 5.25 12.25 5.58579 12.25 6V7.5Z" fill="currentColor"></path></svg></button><button class="p-2 first:rounded-l-full first:pl-2.5 last:rounded-r-full last:pr-2.5 hover:bg-primary-hover hover:text-primary-strong disabled:cursor-not-allowed disabled:hover:bg-inherit disabled:hover:text-inherit disabled:dark:hover:text-inherit ring-tint contrast-more:hover:ring-1 disabled:opacity-7 disabled:contrast-more:ring-0" type="button" aria-label="Not sure" title="Not sure"><svg width="18" height="18" viewBox="0 0 18 18" fill="none" xmlns="http://www.w3.org/2000/svg"><circle cx="9" cy="9" r="9" fill="currentColor" fill-opacity="0.2"></circle><path fill-rule="evenodd" clip-rule="evenodd" d="M5 8.25C4.58579 8.25 4.25 7.91421 4.25 7.5V6C4.25 5.58579 4.58579 5.25 5 5.25C5.41421 5.25 5.75 5.58579 5.75 6V7.5C5.75 7.91421 5.41421 8.25 5 8.25ZM4.5 12C4.5 11.7239 4.72386 11.5 5 11.5H13C13.2761 11.5 13.5 11.7239 13.5 12C13.5 12.2761 13.2761 12.5 13 12.5H5C4.72386 12.5 4.5 12.2761 4.5 12ZM12.25 7.5C12.25 7.91421 12.5858 8.25 13 8.25C13.4142 8.25 13.75 7.91421 13.75 7.5V6C13.75 5.58579 13.4142 5.25 13 5.25C12.5858 5.25 12.25 5.58579 12.25 6V7.5Z" fill="currentColor"></path></svg></button><button class="p-2 first:rounded-l-full first:pl-2.5 last:rounded-r-full last:pr-2.5 hover:bg-primary-hover hover:text-primary-strong disabled:cursor-not-allowed disabled:hover:bg-inherit disabled:hover:text-inherit disabled:dark:hover:text-inherit ring-tint contrast-more:hover:ring-1 disabled:opacity-7 disabled:contrast-more:ring-0" type="button" aria-label="Yes, it was!" title="Yes, it was!"><svg width="18" height="18" viewBox="0 0 18 18" fill="none" xmlns="http://www.w3.org/2000/svg"><circle cx="9" cy="9" r="9" fill="currentColor" fill-opacity="0.2"></circle><path fill-rule="evenodd" clip-rule="evenodd" d="M5 8.25C4.58579 8.25 4.25 7.91421 4.25 7.5V6C4.25 5.58579 4.58579 5.25 5 5.25C5.41421 5.25 5.75 5.58579 5.75 6V7.5C5.75 7.91421 5.41421 8.25 5 8.25ZM4.66782 11.6263C4.87421 11.4428 5.19025 11.4614 5.3737 11.6678C7.30371 13.8391 10.6963 13.8391 12.6263 11.6678C12.8098 11.4614 13.1258 11.4428 13.3322 11.6263C13.5386 11.8098 13.5572 12.1258 13.3737 12.3322C11.0459 14.951 6.9541 14.951 4.6263 12.3322C4.44284 12.1258 4.46143 11.8098 4.66782 11.6263ZM12.25 7.5C12.25 7.91421 12.5858 8.25 13 8.25C13.4142 8.25 13.75 7.91421 13.75 7.5V6C13.75 5.58579 13.4142 5.25 13 5.25C12.5858 5.25 12.25 5.58579 12.25 6V7.5Z" fill="currentColor"></path></svg></button></div></div></div></div></div></main></div></div><script>$RC=function(b,c,e){c=document.getElementById(c);c.parentNode.removeChild(c);var a=document.getElementById(b);if(a){b=a.previousSibling;if(e)b.data="$!",a.setAttribute("data-dgst",e);else{e=b.parentNode;a=b.nextSibling;var f=0;do{if(a&&8===a.nodeType){var d=a.data;if("/$"===d)if(0===f)break;else f--;else"$"!==d&&"$?"!==d&&"$!"!==d||f++}d=a.nextSibling;e.removeChild(a);a=d}while(a);for(;c.firstChild;)e.insertBefore(c.firstChild,a);b.data="$"}b._reactRetry&&b._reactRetry()}};$RC("B:0","S:0")</script><div hidden id="S:1"><div class="grid [&>*+*]:mt-5 whitespace-pre-wrap"><h2 id="i-want-to-start-hacking" class="text-3xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[1em]"><a href="#i-want-to-start-hacking" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-tight"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-tight mt-[1em]">I Want to Start Hacking</div></h2><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">This page has some information on how to get plugged into the Community. If you are ready to start hacking, head over to one of the following sections.</p><h3 id="contributing-to-thunderbird" class="text-2xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[0.75em]"><a href="#contributing-to-thunderbird" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-snug"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-snug mt-[0.75em]">Contributing to Thunderbird</div></h3><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">Get all the information you need to set up your development environment and get ready to hack on Thunderbird.</p><template id="P:2"></template><h3 id="add-on-development" class="text-2xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[0.75em]"><a href="#add-on-development" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-snug"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-snug mt-[0.75em]">Add-on Development</div></h3><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">If you'd like to learn to develop add-ons for Thunderbird, check out our add-on documentation with examples, tips and links to relevant resources.</p><template id="P:3"></template><h2 id="report-bugs-and-request-features" class="text-3xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[1em]"><a href="#report-bugs-and-request-features" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-tight"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-tight mt-[1em]">Report Bugs and Request Features</div></h2><h3 id="bugzilla" class="text-2xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[0.75em]"><a href="#bugzilla" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-snug"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-snug mt-[0.75em]"><template id="P:4"></template></div></h3><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">Thunderbird uses Mozilla's Bugzilla platform to report and track bugs. The site can also be used to generate enhancement bugs, which can be used for feature requests. If you want to become a contributor to Thunderbird, you will need an account on Bugzilla as you will submit patches through this platform.</p><h3 id="profiling-thunderbird-performance" class="text-2xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[0.75em]"><a href="#profiling-thunderbird-performance" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-snug"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-snug mt-[0.75em]"><template id="P:5"></template></div></h3><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">Creating a performance profile can be useful for developers to find the causes of high CPU load or slowness in Thunderbird.</p><template id="B:6"></template><div id="thunderbird-on-github" role="status" aria-busy="true" class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[47px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">If you want to contribute to the Thunderbird website, this documentation, or addons.thunderbird.net - you can find those repositories and their issue trackers on the Thunderbird GitHub page. You'll need a GitHub account to contribute there.</p><h2 id="getting-plugged-into-the-community" class="text-3xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[1em]"><a href="#getting-plugged-into-the-community" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-tight"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-tight mt-[1em]">Getting Plugged into the Community</div></h2><template id="B:7"></template><div role="status" aria-busy="true" class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[35px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div><h3 id="mailing-lists" class="text-2xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[0.75em]"><a href="#mailing-lists" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-snug"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-snug mt-[0.75em]">Mailing Lists</div></h3><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">If you want to participate in discussions about Thunderbird development, these are the main channels.</p><ol class="min-w-0 space-y-2 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><li class="leading-normal flex items-start"><div class="text-base leading-normal mr-1 flex min-h-[1lh] min-w-6 items-center justify-center text-tint"><div class="before:font-var before:content-[--pseudoBefore--content]" style="--pseudoBefore--content:'1.';--font-family:inherit;font-size:min(1em, 24px)"></div></div><div class="flex min-w-0 flex-1 flex-col space-y-2"><template id="B:8"></template><div role="status" aria-busy="true" class="w-full decoration-primary/6 max-w-3xl min-h-[1lh] flip-heading-hash [&:is(h2)>div]:mt-0 [&:is(h3)>div]:mt-0 [&:is(h4)>div]:mt-0 mx-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[35px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div></div></li><li class="leading-normal flex items-start"><div class="text-base leading-normal mr-1 flex min-h-[1lh] min-w-6 items-center justify-center text-tint"><div class="before:font-var before:content-[--pseudoBefore--content]" style="--pseudoBefore--content:'2.';--font-family:inherit;font-size:min(1em, 24px)"></div></div><div class="flex min-w-0 flex-1 flex-col space-y-2"><template id="B:9"></template><div role="status" aria-busy="true" class="w-full decoration-primary/6 max-w-3xl min-h-[1lh] flip-heading-hash [&:is(h2)>div]:mt-0 [&:is(h3)>div]:mt-0 [&:is(h4)>div]:mt-0 mx-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[35px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div></div></li><li class="leading-normal flex items-start"><div class="text-base leading-normal mr-1 flex min-h-[1lh] min-w-6 items-center justify-center text-tint"><div class="before:font-var before:content-[--pseudoBefore--content]" style="--pseudoBefore--content:'3.';--font-family:inherit;font-size:min(1em, 24px)"></div></div><div class="flex min-w-0 flex-1 flex-col space-y-2"><template id="B:a"></template><div role="status" aria-busy="true" class="w-full decoration-primary/6 max-w-3xl min-h-[1lh] flip-heading-hash [&:is(h2)>div]:mt-0 [&:is(h3)>div]:mt-0 [&:is(h4)>div]:mt-0 mx-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[35px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div></div></li></ol><h3 id="chat" class="text-2xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[0.75em]"><a href="#chat" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-snug"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-snug mt-[0.75em]">Chat</div></h3><template id="B:b"></template><div role="status" aria-busy="true" class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="ring-1 ring-tint-subtle overflow-hidden relative grid rounded-md h-[35px] [max-width:calc(48rem-1px)]"><div class="w-full bg-tint grid grid-area-1-1 overflow-hidden [mask:conic-gradient(from_90deg_at_1px_1px,_#0000_90deg,_#0003_0)_calc(50%+1px)_calc(0%+47px)_/_12px_12px]"><div class="aspect-square from-tint-solid to-transparent grid-area-1-1 relative origin-[50%_50%] top-[50%] self-stretch bg-transparent will-change-transform animate-[rotateLoop_2s_linear_infinite] [background-image:conic-gradient(from_-90deg_at_50%_50%,_var(--tw-gradient-stops)_0deg,_var(--tw-gradient-stops)_90deg,_var(--tw-gradient-stops)_280deg)]"></div></div></div></div></div></div><div hidden id="S:6"><h3 id="thunderbird-on-github" class="text-2xl font-semibold heading group relative grid scroll-m-12 mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0"><div class="hash grid grid-area-1-1 relative -ml-6 w-7 border-0 opacity-0 group-hover:opacity-[0] group-focus:opacity-[0] md:group-hover:md:opacity-[1] md:group-focus:md:opacity-[1] mt-[0.75em]"><a href="#thunderbird-on-github" aria-label="Direct link to heading" class="inline-flex h-full items-start leading-snug"><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/hashtag.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon w-3.5 h-[1em] mt-0.5 transition-colors text-transparent group-hover:text-tint-subtle contrast-more:group-hover:text-tint-strong lg:w-4"></svg></a></div><div class="grid-area-1-1 z-[1] justify-self-start text-left leading-snug mt-[0.75em]"><template id="P:c"></template></div></h3></div><div hidden id="S:7"><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">We have a complete listing of the ways in which you can get involved with Thunderbird <template id="P:d"></template>. Below are some quick references from that page that you can use if you are looking to contribute to Thunderbird core right away.</p></div><div hidden id="S:8"><p class="w-full decoration-primary/6 max-w-3xl min-h-[1lh] flip-heading-hash [&:is(h2)>div]:mt-0 [&:is(h3)>div]:mt-0 [&:is(h4)>div]:mt-0 mx-0"><template id="P:e"></template><strong class="font-bold">:</strong> This mailing list is higher level topics like: the future of Thunderbird, potential features, and changes that you would like to see happen. It is also used to discuss a variety of broader issues around community and governance of the project.</p></div><div hidden id="S:9"><p class="w-full decoration-primary/6 max-w-3xl min-h-[1lh] flip-heading-hash [&:is(h2)>div]:mt-0 [&:is(h3)>div]:mt-0 [&:is(h4)>div]:mt-0 mx-0"><template id="P:f"></template><strong class="font-bold">:</strong> A moderated mailing list for discussing engineering plans for Thunderbird. It is a place where you can raise questions and ideas for core Thunderbird development.</p></div><div hidden id="S:a"><p class="w-full decoration-primary/6 max-w-3xl min-h-[1lh] flip-heading-hash [&:is(h2)>div]:mt-0 [&:is(h3)>div]:mt-0 [&:is(h4)>div]:mt-0 mx-0"><template id="P:10"></template>: A list for Thunderbird add-on developers and aspiring add-on developers to ask questions and share knowledge.</p></div><div hidden id="S:b"><p class="mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0">If you want to ask questions in real-time about how to hack on Thunderbird, you can join our development chat channel at <template id="P:11"></template></p></div><div hidden id="S:2"><a class="group flex flex-row justify-between items-center gap-4 ring-1 ring-tint-subtle rounded straight-corners:rounded-none px-5 py-3 transition-shadow hover:ring-primary-hover mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0" href="/thunderbird-development/getting-started"><span class="flex flex-col flex-1"><span class="text-base transition-colors group-hover:text-primary">Getting Started Contributing</span></span><svg style="mask-image:url(https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/chevron-right.svg?v=2&token=a463935e93);mask-repeat:no-repeat;mask-position:center" class="gb-icon size-3 text-tint transition-all group-hover:translate-x-0.5 group-hover:text-primary"></svg></a></div><script>$RS=function(a,b){a=document.getElementById(a);b=document.getElementById(b);for(a.parentNode.removeChild(a);a.firstChild;)b.parentNode.insertBefore(a.firstChild,b);b.parentNode.removeChild(b)};$RS("S:2","P:2")</script><div hidden id="S:3"><a class="group flex flex-row justify-between items-center gap-4 ring-1 ring-tint-subtle rounded straight-corners:rounded-none px-5 py-3 transition-shadow hover:ring-primary-hover mx-auto w-full decoration-primary/6 max-w-3xl page-api-block:ml-0" href="/add-ons/about-add-ons"><span class="flex flex-col flex-1"><span 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