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<!doctype html> <html class="writer-html5" lang="en" data-content_root="../../"> <head> <base href="https://firefox-source-docs.mozilla.org/devtools-user/browser_console/index.html"> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Browser Console — Firefox Source Docs documentation</title> <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50"> <link rel="stylesheet" type="text/css" href="../../_static/css/theme.css?v=19f00094"> <link rel="stylesheet" type="text/css" href="../../_static/graphviz.css?v=fd3f3429"> <link rel="stylesheet" type="text/css" href="../../_static/copybutton.css?v=76b2166b"> <link rel="stylesheet" type="text/css" href="../../_static/custom_theme.css?v=dc5ed815"> <link rel="stylesheet" type="text/css" href="../../_static/design-style.1e8bd061cd6da7fc9cf755528e8ffc24.min.css?v=0a3b3ea7"> <link rel="shortcut icon" 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class="wy-side-scroll"> <div class="wy-side-nav-search"><a href="https://firefox--source--docs-mozilla-org.translate.goog/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB" class="icon icon-home"> Firefox Source Docs <img src="../../_static/firefox-wordmark.svg" class="logo" alt="Logo"> </a> <div> <h3>Quick search</h3> <script> (function () { var cx = "dd12886298f75dbef"; var gcse = document.createElement("script"); gcse.async = true; gcse.src = "https://cse.google.com/cse.js?cx=" + cx; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(gcse, s); })(); </script><gcse:search></gcse:search> </div> </div> <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu"> <p class="caption" role="heading"><span class="caption-text">Overview</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/glossary/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">A Glossary of Common Terms</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/overview/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">A Quick Guide to Mozilla Applications</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Getting Started</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/setup/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Getting Set Up To Work On The Firefox Codebase</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Working On Firefox</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/contributing/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Working on Firefox</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/bug-mgmt/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Bug Handling</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Firefox User Guide</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Firefox DevTools User Docs</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Source Code Documentation</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/mots/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Governance</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/browser/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Firefox Front-end</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/dom/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">DOM</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/editor/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Editor</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/layout/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Style system (CSS) & Layout</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/gfx/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Graphics</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/ipc/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Processes, Threads and IPC</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Firefox DevTools Contributor Docs</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/toolkit/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Toolkit</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/js/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">SpiderMonkey</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/jsloader/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">JS Loader</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/mobile/android/geckoview/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">GeckoView</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/mobile/android/fenix/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Fenix</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/mobile/android/focus-android/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Focus for Android</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/dom/bindings/webidl/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">WebIDL</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/modules/libpref/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">libpref</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/networking/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Networking</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/remote/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Remote Protocols</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/services/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Services</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/permissions/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Permissions</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/uriloader/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">File Handling</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/widget/cocoa/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Firefox on macOS</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/widget/windows/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Firefox on Windows</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/toolkit/components/ml/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Firefox AI Runtime</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/accessible/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Accessibility</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/media/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Media Playback</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/code-quality/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Code quality</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/writing-rust-code/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Writing Rust Code</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/rust-components/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Rust Components</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/tools/profiler/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Gecko Profiler</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/performance/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Performance</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/storage/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Database bindings (SQLite, KV, …)</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/xpcom/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">XPCOM</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/nspr/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">NSPR</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/security/nss/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Network Security Services (NSS)</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/content-security/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Web Security Checks in Gecko</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">The Firefox Build System</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/mach/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Mach</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/tools/try/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Pushing to Try</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/build/buildsystem/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Build System</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/taskcluster/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Firefox CI and Taskgraph</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/tools/moztreedocs/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Managing Documentation</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/mozbuild/vendor/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Vendoring Third Party Components</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Testing & Test Infrastructure</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/automated-testing/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Automated Testing</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/treeherder-try/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Understanding Treeherder Results</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/sheriffed-intermittents/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Sheriffed intermittent failures</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/tests-for-new-config/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Turning on Firefox tests for a new configuration</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/intermittent/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Avoiding intermittent tests</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/testing-policy/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Testing Policy</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/ci-configs/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Configuration Changes</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/browser-chrome/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Browser chrome mochitests</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/chrome-tests/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Chrome Tests</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/marionette/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Marionette</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/geckodriver/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">geckodriver</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/test-verification/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Test Verification</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/webrender/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">WebRender Tests</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/mochitest-plain/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Mochitest</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/xpcshell/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">XPCShell tests</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/tps/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">TPS</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/web-platform/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">web-platform-tests</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/gtest/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">GTest</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/tools/fuzzing/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Fuzzing</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/tools/sanitizer/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Sanitizer</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing/perfdocs/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Performance Testing</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/tools/code-coverage/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Code coverage</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/testing-rust-code/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Testing & Debugging Rust Code</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Releases & Updates</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/update-infrastructure/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Mozilla Update Infrastructure</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/update-infrastructure/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#watershed-updates">Watershed Updates</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/update-infrastructure/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#desupport-updates">Desupport Updates</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/tools/update-verify/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Update Verify</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Localization & Internationalization</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/intl/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Internationalization</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/l10n/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Localization</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Firefox and Python</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/mozbase/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">mozbase</a></li> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/python/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Using third-party Python packages</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">Metrics Collected in Firefox</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/metrics/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Metrics</a></li> </ul> </div> </div> </nav> <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> <nav class="wy-nav-top" aria-label="Mobile navigation menu"><i data-toggle="wy-nav-top" class="fa fa-bars"></i> <a href="https://firefox--source--docs-mozilla-org.translate.goog/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Firefox Source Docs</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="Page navigation"> <ul class="wy-breadcrumbs"> <li><a href="https://firefox--source--docs-mozilla-org.translate.goog/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB" class="icon icon-home" aria-label="Home"></a></li> <li class="breadcrumb-item active">Browser Console</li> <li class="wy-breadcrumbs-aside"><a href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://bugzilla.mozilla.org/enter_bug.cgi?product%3DDeveloper%2BInfrastructure%26component%3DFirefox%2BSource%2BDocs%253A%2BContent%26short_desc%3DDocumentation%2Bissue%2Bon%2Bdevtools-user/browser_console/index%26comment%3DURL%2B%3D%2Bhttps://firefox-source-docs.mozilla.org/devtools-user/browser_console/index.html%26bug_file_loc%3Dhttps://firefox-source-docs.mozilla.org/devtools-user/browser_console/index.html" rel="nofollow">Report an issue</a> / <a href="https://firefox--source--docs-mozilla-org.translate.goog/_sources/devtools-user/browser_console/index.rst.txt?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB" rel="nofollow"> View page source</a></li> </ul> <hr> </div> <div role="main" class="document" itemscope itemtype="http://schema.org/Article"> <div itemprop="articleBody"> <section id="browser-console"> <h1>Browser Console<a class="headerlink" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#browser-console" title="Link to this heading"></a></h1> <p>The Browser Console is like the <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">Web Console</span></a>, but applied to the whole browser rather than a single content tab.</p> <p>So it logs the same sorts of information as the Web Console - network requests, JavaScript, CSS, and security errors and warnings, and messages explicitly logged by JavaScript code. However, rather than logging this information for a single content tab, it logs information for all content tabs, for add-ons, and for the browser’s own code.</p> <p>If you also want to use the other web developer tools in the regular Web <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/tools_toolbox/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">Toolbox</span></a> with add-on or browser code, consider using the <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_toolbox/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">Browser Toolbox</span></a>.</p> <p>Similarly, you can execute JavaScript expressions using the Browser Console. But while the Web Console executes code in the page window scope, the Browser Console executes them in the scope of the browser’s chrome window. This means you can interact with all the browser’s tabs using the <code class="docutils literal notranslate"><span class="pre">gBrowser</span></code> global, and even with the XUL used to specify the browser’s user interface.</p> <div class="block-quote docutils container"> <p>NB: The Browser Console command line (to execute JavaScript expressions) is disabled by default. To enable it set the <code class="docutils literal notranslate"><span class="pre">devtools.chrome.enabled</span></code> preference to <code class="docutils literal notranslate"><span class="pre">true</span></code> in <a class="reference external" href="about:config?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">about:config</a>, or set the “Enable browser <a class="reference external" href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Glossary/Chrome">chrome</a> and add-on debugging toolboxes” (Firefox 40 and later) option in the <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/settings/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">developer tool settings</span></a>.</p> </div> <section id="opening-the-browser-console"> <h2>Opening the Browser Console<a class="headerlink" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#opening-the-browser-console" title="Link to this heading"></a></h2> <p>You can open the Browser Console in one of two ways:</p> <ol class="arabic simple"> <li><p>from the menu: select “Browser Console” from the Browser Tools submenu in the Firefox Menu (or Tools menu if you display the menu bar or are on macOS).</p></li> <li><p>from the keyboard: press <kbd class="kbd docutils literal notranslate">Ctrl</kbd> + <kbd class="kbd docutils literal notranslate">Shift</kbd> + <kbd class="kbd docutils literal notranslate">J</kbd> (or <kbd class="kbd docutils literal notranslate">Cmd</kbd> + <kbd class="kbd docutils literal notranslate">Shift</kbd> + <kbd class="kbd docutils literal notranslate">J</kbd> on a Mac).</p></li> </ol> <p>You can also start the Browser Console by launching Firefox from the command line and passing the <code class="docutils literal notranslate"><span class="pre">-jsconsole</span></code> argument:</p> <div class="highlight-bash notranslate"> <div class="highlight"> <pre><span></span>/Applications/FirefoxAurora.app/Contents/MacOS/firefox<span class="w"> </span>-jsconsole </pre> </div> </div> <p>The Browser Console looks like this:</p><img alt="../../_images/browser_console_68.png" src="../../_images/browser_console_68.png"> <p>You can see that the Browser Console looks and behaves very much like the <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">Web Console</span></a>:</p> <ul class="simple"> <li><p>most of the window is occupied by a <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/console_messages/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">pane that display messages</span></a></p></li> <li><p>at the top, a <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/ui_tour/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#web-console-ui-tour-toolbar"><span class="std std-ref">toolbar</span></a> enables you to filter the messages that appear.</p></li> <li><p>at the bottom, a <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/the_command_line_interpreter/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">command line interpreter</span></a> enables you to evaluate JavaScript expressions.</p></li> </ul> <p>Beginning with Firefox 68, the Browser Console allows you to show or hide messages from the content process (i.e. the messages from scripts in all the opened pages) by setting or clearing the checkbox labeled <strong>Show Content Messages</strong>. The following image shows the browser console focused on the same page as above after clicking on the <strong>Show Content Messages</strong> checkbox.</p><img alt="../../_images/browser_console_68_02.png" src="../../_images/browser_console_68_02.png"> </section> <section id="browser-console-logging"> <h2>Browser Console logging<a class="headerlink" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#browser-console-logging" title="Link to this heading"></a></h2> <p>The Browser console logs the same sorts of messages as the Web Console:</p> <ul class="simple"> <li><p><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/console_messages/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#web-console-console-messages"><span class="std std-ref">HTTP requests</span></a></p></li> <li><p><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/console_messages/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">Warnings and errors</span></a> (including JavaScript, CSS, security warnings and errors, and messages explicitly logged by JavaScript code using the <a class="reference external" href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/console">Console API</a></p></li> <li><p><a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/console_messages/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#web-console-console-messages-interpreter-io"><span class="std std-ref">Input/output messages</span></a> commands send to the browser via the command line, and the result of executing them</p></li> </ul> <p>However, it displays such messages from:</p> <ul class="simple"> <li><p>web content hosted by all browser tabs</p></li> <li><p>the browser’s own code</p></li> <li><p>add-ons</p></li> </ul> <section id="messages-from-add-ons"> <h3>Messages from add-ons<a class="headerlink" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#messages-from-add-ons" title="Link to this heading"></a></h3> <p>The Browser Console displays messages logged by all Firefox add-ons.</p> <section id="console-sys-mjs"> <h4>Console.sys.mjs<a class="headerlink" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#console-sys-mjs" title="Link to this heading"></a></h4> <p>To use the console API from a traditional or bootstrapped add-on, get it from the Console module.</p> <p>One exported symbol from <code class="docutils literal notranslate"><span class="pre">Console.sys.mjs</span></code> is <code class="docutils literal notranslate"><span class="pre">console</span></code>. Below is an example of how to access it, which adds a message to the Browser Console.</p> <div class="highlight-JavaScript notranslate"> <div class="highlight"> <pre><span></span><span class="kd">const</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">console</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">ChromeUtils</span><span class="p">.</span><span class="nx">importESModule</span><span class="p">(</span><span class="s2">"resource://gre/modules/Console.sys.mjs"</span><span class="p">);</span> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">"Hello from Firefox code"</span><span class="p">);</span><span class="w"> </span><span class="c1">//output messages to the console</span> </pre> </div> </div> <p>Learn more:</p> <ul class="simple"> <li><p><a class="reference external" href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/console">Console API reference</a></p></li> <li><p><a class="reference external" href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://searchfox.org/mozilla-central/source/toolkit/modules/Console.sys.mjs">Console.sys.mjs source code</a></p></li> </ul> </section> </section> </section> <section id="browser-console-command-line"> <h2>Browser Console command line<a class="headerlink" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#browser-console-command-line" title="Link to this heading"></a></h2> <div class="block-quote docutils container"> <p>The Browser Console command line is disabled by default. To enable it set the <code class="docutils literal notranslate"><span class="pre">devtools.chrome.enabled</span></code> preference to <code class="docutils literal notranslate"><span class="pre">true</span></code> in <code class="docutils literal notranslate"><span class="pre">about:config</span></code>, or set the “Enable chrome debugging” option in the <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/settings/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">developer tool settings</span></a>.</p> </div> <p>Like the Web Console, the command line interpreter enables you to evaluate JavaScript expressions in real time:</p><img alt="../../_images/browser-console-commandline.png" src="../../_images/browser-console-commandline.png"> <p>Also like the Web Console’s command line interpreter, this command line supports autocomplete, history, and various <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/keyboard_shortcuts/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#keyboard-shortcuts-web-console"><span class="std std-ref">keyboard shortcuts</span></a> and <a class="reference internal" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/web_console/helpers/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><span class="doc">helper commands</span></a>. If the result of a command is an object, you can click on the object to see its details.</p> <p>But while the Web Console executes code in the scope of the content window it’s attached to, the browser console executes code in the scope of the chrome window of the browser. You can confirm this by evaluating <code class="docutils literal notranslate"><span class="pre">window</span></code>:</p><img alt="../../_images/browser-console-chromewindow.png" src="../../_images/browser-console-chromewindow.png"> <p>This means you can control the browser: opening, closing tabs and windows and changing the content that they host, and modify the browser’s UI by creating, changing and removing XUL elements.</p> <section id="controlling-the-browser"> <h3>Controlling the browser<a class="headerlink" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#controlling-the-browser" title="Link to this heading"></a></h3> <p>The command line interpreter gets access to the <code class="docutils literal notranslate"><span class="pre">tabbrowser</span></code> object, through the <code class="docutils literal notranslate"><span class="pre">gBrowser</span></code> global, and that enables you to control the browser through the command line. Try running this code in the Browser Console’s command line (remember that to send multiple lines to the Browser Console, use <kbd class="kbd docutils literal notranslate">Shift</kbd> + <kbd class="kbd docutils literal notranslate">Enter</kbd>):</p> <div class="highlight-JavaScript notranslate"> <div class="highlight"> <pre><span></span><span class="kd">var</span><span class="w"> </span><span class="nx">newTabBrowser</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">gBrowser</span><span class="p">.</span><span class="nx">getBrowserForTab</span><span class="p">(</span><span class="nx">gBrowser</span><span class="p">.</span><span class="nx">selectedTab</span><span class="p">);</span> <span class="nx">newTabBrowser</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">(</span><span class="s2">"load"</span><span class="p">,</span><span class="w"> </span><span class="kd">function</span><span class="p">()</span><span class="w"> </span><span class="p">{</span> <span class="w"> </span><span class="nx">newTabBrowser</span><span class="p">.</span><span class="nx">contentDocument</span><span class="p">.</span><span class="nx">body</span><span class="p">.</span><span class="nx">innerHTML</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"<h1>this page has been eaten</h1>"</span><span class="p">;</span> <span class="p">},</span><span class="w"> </span><span class="kc">true</span><span class="p">);</span> <span class="nx">newTabBrowser</span><span class="p">.</span><span class="nx">contentDocument</span><span class="p">.</span><span class="nx">location</span><span class="p">.</span><span class="nx">href</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"https://mozilla.org/"</span><span class="p">;</span> </pre> </div> </div> <p>It adds a listener to the currently selected tab’s <code class="docutils literal notranslate"><span class="pre">load</span></code> event that will eat the new page, then loads a new page.</p> <div class="admonition note"> <p class="admonition-title">Note</p> <p>You can restart the browser with the command <kbd class="kbd docutils literal notranslate">Ctrl</kbd> + <kbd class="kbd docutils literal notranslate">Alt</kbd> + <kbd class="kbd docutils literal notranslate">R</kbd> (Windows, Linux) or <kbd class="kbd docutils literal notranslate">Cmd</kbd> + <kbd class="kbd docutils literal notranslate">Alt</kbd> + <kbd class="kbd docutils literal notranslate">R</kbd> (Mac) This command restarts the browser with the same tabs open as before the restart.</p> </div> </section> <section id="modifying-the-browser-ui"> <h3>Modifying the browser UI<a class="headerlink" href="https://firefox--source--docs-mozilla-org.translate.goog/devtools-user/browser_console/index.html?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#modifying-the-browser-ui" title="Link to this heading"></a></h3> <p>Since the global <code class="docutils literal notranslate"><span class="pre">window</span></code> object is the browser’s chrome window, you can also modify the browser’s user interface. On Windows, the following code will add a new item to the browser’s main menu:</p> <div class="highlight-JavaScript notranslate"> <div class="highlight"> <pre><span></span><span class="kd">var</span><span class="w"> </span><span class="nx">parent</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">window</span><span class="p">.</span><span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s2">"appmenuPrimaryPane"</span><span class="p">);</span> <span class="kd">var</span><span class="w"> </span><span class="nx">makeTheTea</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">gBrowser</span><span class="p">.</span><span class="nx">ownerDocument</span><span class="p">.</span><span class="nx">defaultView</span><span class="p">.</span><span class="nb">document</span><span class="p">.</span><span class="nx">createElementNS</span><span class="p">(</span><span class="s2">"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"</span><span class="p">,</span><span class="w"> </span><span class="s2">"menuitem"</span><span class="p">);</span> <span class="nx">makeTheTea</span><span class="p">.</span><span class="nx">setAttribute</span><span class="p">(</span><span class="s2">"label"</span><span class="p">,</span><span class="w"> </span><span class="s2">"A nice cup of tea?"</span><span class="p">);</span> <span class="nx">parent</span><span class="p">.</span><span class="nx">appendChild</span><span class="p">(</span><span class="nx">makeTheTea</span><span class="p">);</span> </pre> </div> </div><img alt="../../_images/browser-console-modify-ui-windows.png" src="../../_images/browser-console-modify-ui-windows.png"> <p>On macOS, this similar code will add a new item to the <strong>Tools</strong> menu:</p> <div class="highlight-JavaScript notranslate"> <div class="highlight"> <pre><span></span><span class="kd">var</span><span class="w"> </span><span class="nx">parent</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">window</span><span class="p">.</span><span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s2">"menu_ToolsPopup"</span><span class="p">);</span> <span class="kd">var</span><span class="w"> </span><span class="nx">makeTheTea</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">gBrowser</span><span class="p">.</span><span class="nx">ownerDocument</span><span class="p">.</span><span class="nx">defaultView</span><span class="p">.</span><span class="nb">document</span><span class="p">.</span><span class="nx">createElementNS</span><span class="p">(</span><span class="s2">"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"</span><span class="p">,</span><span class="w"> </span><span class="s2">"menuitem"</span><span class="p">);</span> <span class="nx">makeTheTea</span><span class="p">.</span><span class="nx">setAttribute</span><span class="p">(</span><span class="s2">"label"</span><span class="p">,</span><span class="w"> </span><span class="s2">"A nice cup of tea?"</span><span class="p">);</span> <span class="nx">parent</span><span class="p">.</span><span class="nx">appendChild</span><span class="p">(</span><span class="nx">makeTheTea</span><span class="p">);</span> </pre> </div> </div><img alt="../../_images/browser-console-modify-ui-osx.png" src="../../_images/browser-console-modify-ui-osx.png"> </section> </section> </section> </div> </div> <footer> <hr> <div role="contentinfo"> <p></p> </div> Built with <a href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://www.sphinx-doc.org/">Sphinx</a> using a <a href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://github.com/readthedocs/sphinx_rtd_theme">theme</a> provided by <a href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://readthedocs.org">Read the Docs</a>. </footer> </div> </div> </section> </div> <script> jQuery(function () { SphinxRtdTheme.Navigation.enable(true); }); </script> <script>function gtElInit() {var lib = new google.translate.TranslateService();lib.translatePage('pl', 'iw', function () {});}</script> <script src="https://translate.google.com/translate_a/element.js?cb=gtElInit&hl=en-GB&client=wt" type="text/javascript"></script> </body> </html>