Manifest V3 updates landed in Firefox 127 - Mozilla Add-ons Community Blog

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"> <ul class="content"> <li class="nav-util-sidebar"><a href="#sidebar" aria-controls="sidebar" id="toggle-sidebar">Explore</a></li> <li class="nav-util-search"> <form id="search" class="fm-search" method="get" action="https://blog.mozilla.org/addons/"> <fieldset> <p> <label for="s">Search this site</label> <input type="search" value="" name="s" id="s"> <button type="submit" class="button button-minor">Search</button> </p> </fieldset> </form> </li> </ul> </nav> <main id="content"> <div class="content"> <article id="post-9183" class="post post-9183 type-post status-publish format-standard hentry category-developers tag-add-ons tag-developers tag-extensions tag-mv3"> <header class="entry-header"> <div class="entry-tools"> <div class="categories"> <b>Categories:</b> <a href="https://blog.mozilla.org/addons/category/developers/" rel="category tag">developers</a> </div> </div> <h1 class="entry-title"> Manifest V3 updates landed in Firefox 127 </h1> <div class="entry-info"> <address class="vcard"> <a href="https://blog.mozilla.org/addons/author/esullivanmozilla-com/" title="Posts by Edward Sullivan" rel="author">Edward Sullivan</a> </address> <time class="date published" datetime="2024-06-13T08:20:29-07:00">June 13, 2024</time> <p class="entry-comments"> <a href="https://blog.mozilla.org/addons/2024/06/13/manifest-v3-updates-landed-in-firefox-127/#comments">2 responses</a> </p> </div> </header> <div class="entry-content"> <p>Welcome add-on developers! Below is the next installation in our series of community updates designed to provide clarity and transparency as we continue to deliver Manifest V3 related improvements with each new Firefox release.</p> <p>The engineering team continues to build upon previous MV3 Chrome compatibility related work available in <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/126#changes_for_add-on_developers">Firefox 126</a> with several additional items that landed in <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/127#changes_for_add-on_developers">Firefox 127</a>, which was released on June 11. Beginning in the 127 release, the following improvements have launched:</p> <ul> <li aria-level="1">Customized keyboard shortcuts associated with the <code><span style="color: #339966;">_execute_browser_action</span></code> command for MV2 extensions will be automatically associated with the <code><span style="color: #339966;">_execute_action</span></code> command when migrating the same extension to MV3. This allows the custom keyboard shortcuts to keep functioning as expected from an end user perspective.</li> <li aria-level="1">declarativeNetRequest <code><span style="color: #339966;">getDynamicRules</span></code> and <code><span style="color: #339966;">getSessonRules</span></code> API methods now accept the additional <span style="color: #339966;"><code><span style="color: #339966;">ruleIds</span></code></span> filter as a parameter and the rule limits have been increased to match the limits enforced by other browsers.</li> </ul> <p>The team will land more Chrome compatibility enhancements in Firefox 128 in addition to delivering other Manifest V3 improvements, at which time MV3 will be supported on Firefox for Android.</p> <p>And to reiterate a couple important points we’ve communicated in our previous updates published in <a href="https://blog.mozilla.org/addons/2024/03/13/manifest-v3-manifest-v2-march-2024-update/">March</a> and <a href="https://blog.mozilla.org/addons/2024/05/14/manifest-v3-updates/">May</a>:</p> <ul> <li aria-level="1">The webRequest API is not on a deprecation path in Firefox</li> <li aria-level="1">Mozilla has no plans to deprecate MV2</li> </ul> <p>For more information on adopting MV3, please refer to our <a href="https://extensionworkshop.com/documentation/develop/manifest-v3-migration-guide/">migration guide</a>. If you have questions or feedback on our MV3 plans we would love to hear from you in the comments section below or if you prefer, drop us an <a href="mailto:mozilla-add-ons-community@mozilla.com">email</a>. Thanks for reading and happy coding!</p> </div> <footer class="entry-tags"> <p><b>Tags:</b> <a href="https://blog.mozilla.org/addons/tag/add-ons/" rel="tag">add-ons</a>, <a href="https://blog.mozilla.org/addons/tag/developers/" rel="tag">developers</a>, <a href="https://blog.mozilla.org/addons/tag/extensions/" rel="tag">extensions</a>, <a href="https://blog.mozilla.org/addons/tag/mv3/" rel="tag">MV3</a></p> </footer> <footer class="fx-footer"> <h4>Browse fast. 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Please check your inbox or your spam filter for an e-mail from us. </p> </div> </form> </aside> <section id="comments" class="section"> <div class="content"> <header class="comments-head"> <h3> 2 comments on “Manifest V3 updates landed in Firefox 127” </h3> </header> <ol id="comment-list" class="comment-list hfeed"> <li id="comment-227839" class="comment even thread-even depth-1 hentry"> <h4 class="entry-title vcard"> <cite class="author fn">xmcp</cite> <span class="photo"><img alt='' src='https://secure.gravatar.com/avatar/ae78ff8659cb838c1d96e030d230d599?s=60&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/ae78ff8659cb838c1d96e030d230d599?s=120&d=mm&r=g 2x' class='avatar avatar-60 photo' height='60' width='60' loading='lazy' decoding='async'/></span> <span class="comment-meta"> wrote on <a href="https://blog.mozilla.org/addons/2024/06/13/manifest-v3-updates-landed-in-firefox-127/#comment-227839" rel="bookmark" title="Permanent link to this comment by xmcp"> <time class="published" datetime="2024-06-18" title="2024-06-18"> June 18, 2024 at 6:18 am: </time> </a> </span> </h4> <blockquote class="entry-content"> <p>Is there any plan to support chrome.storage.session.setAccessLevel? Content scripts in MV3 will need this API to store runtime states in memory. The issue for it (#1724754) has been opened for 3 years and it is still not implemented.</p> </blockquote> <p class="comment-util"> </p> </li> <li id="comment-227842" class="comment odd alt thread-odd thread-alt depth-1 hentry"> <h4 class="entry-title vcard"> <cite class="author fn">Khan Zain</cite> <span class="photo"><img alt='' src='https://secure.gravatar.com/avatar/59624a8c393f9ef1b6a11d59cefb6202?s=60&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/59624a8c393f9ef1b6a11d59cefb6202?s=120&d=mm&r=g 2x' class='avatar avatar-60 photo' height='60' width='60' loading='lazy' decoding='async'/></span> <span class="comment-meta"> wrote on <a href="https://blog.mozilla.org/addons/2024/06/13/manifest-v3-updates-landed-in-firefox-127/#comment-227842" rel="bookmark" title="Permanent link to this comment by Khan Zain"> <time class="published" datetime="2024-07-05" title="2024-07-05"> July 5, 2024 at 3:42 am: </time> </a> </span> </h4> <blockquote class="entry-content"> <p>Certainly! Here’s a positive and appreciative comment that acknowledges the updates and provides constructive feedback:</p> <p>“Thank you, Edward and the Firefox team, for your continued dedication to improving Manifest V3 support. The updates in Firefox 127, especially the automatic association of custom keyboard shortcuts and the enhanced declarativeNetRequest API, are fantastic steps towards smoother transitions for developers. It’s also reassuring to know that the webRequest API and MV2 will remain supported. Looking forward to the upcoming enhancements in Firefox 128 and the support for MV3 on Firefox for Android. Keep up the great work!”</p> <p>This comment expresses gratitude, acknowledges specific updates, and shows anticipation for future improvements.</p> </blockquote> <p class="comment-util"> </p> </li> </ol> </div> </section> </main> <aside id="sidebar" class="section widgets can-stick"> <div class="content"> <aside id="text-456878582" class="widget widget_text"><h3 class="widget-title">Looking for add-ons?</h3> <div class="textwidget"><p><strong><a href="https://addons.mozilla.org/?utm_source=blog.mozilla.org&utm_medium=referral&utm_content=sidebar-link">Search & install add-ons</a></strong></p> </div> </aside><aside id="categories-254997392" class="widget widget_categories"><h3 class="widget-title">Tags</h3> <ul> <li class="cat-item cat-item-7117"><a href="https://blog.mozilla.org/addons/category/builder/">builder</a> (77) </li> <li class="cat-item cat-item-388"><a href="https://blog.mozilla.org/addons/category/compatibility/">compatibility</a> (277) </li> <li class="cat-item 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