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firefox source tree documentation firefox source docs documentation firefox source docs quick search overview a glossary of common terms a quick guide to mozilla applications getting started getting set up to work on the firefox codebase working on firefox working on firefox bug handling firefox user guide firefox devtools user docs source code documentation governance firefox front end dom editor style system css layout graphics processes threads and ipc firefox devtools contributor docs toolkit spidermonkey js loader geckoview fenix focus for android webidl libpref networking remote protocols services permissions file handling firefox on macos firefox on windows firefox ai runtime accessibility media playback code quality writing rust code rust components gecko profiler performance database bindings sqlite kv xpcom nspr network security services nss web security checks in gecko the firefox build system mach pushing to try build system firefox ci and taskgraph managing documentation vendoring third party components testing test infrastructure automated testing understanding treeherder results sheriffed intermittent failures turning on firefox tests for a new configuration avoiding intermittent tests debugging intermittent test failures testing policy configuration changes browser chrome mochitests chrome tests marionette geckodriver test verification webrender tests mochitest xpcshell tests tps web platform tests gtest fuzzing sanitizer performance testing code coverage testing debugging rust code ai agent tools ai agent tools for firefox development releases updates mozilla update infrastructure watershed updates desupport updates update verify localization internationalization internationalization localization firefox and python mozbase using third party python packages metrics collected in firefox metrics firefox source docs firefox source tree documentation report an issue view page source firefox source tree documentation overview a glossary of common terms a quick guide to mozilla applications gecko firefox for desktop firefox for android firefox for ios getting started getting set up to work on the firefox codebase working on firefox working on firefox firefox contributors quick reference working with stack of patches quick reference pocket guide shipping firefox editor ide integration getting reviews levelling up how to submit a patch data collection data review introduction to jujutsu searchfox firefox ai coding policy code review faq reviewer checklist capturing a minidump debugging a hang on macos debugging a minidump debugging firefox with gdb debugging firefox with lldb debugging firefox with pernosco debugging firefox with rr debugging firefox with valgrind debugging on macos debugging on windows debugging webrtc calls symbolicating treeherder stacks locally how to get a process dump with windows task manager how to get a stacktrace for a bug report how to get a stacktrace with windbg understanding crash reports configure development certificate signing local macos builds firefox source code directory structure understanding artifact builds firefox for mobile devices supported build hosts and targets engineering show and tell filing good bugs bug handling guides policies processes related documentation firefox user guide firefox devtools user docs the core tools more tools connecting the developer tools debugging the browser extending devtools migrating from firebug contribute source code documentation governance overview modules firefox front end how to s address bar browser usage telemetry frontend code review best practices command line parameters browser startup category manager indirection callmodulesfromcategory customizableui component enterprise policies web apps in firefox form autofill firefox home new tab firefox welcome experience about welcome installer installation attribution default browser agent migration pagedataservice places messaging system search ip protection tabbrowser touch bar uitour firefox branding storybook for firefox reusable ui widgets other types of ui widgets lit xul and html figma code connect design tokens json design tokens backup component sidebar moz cached ohttp protocol dom dom ipc dom navigation push script security xray vision dom workers storage web idl bindings ioutils migration guide federated credential management implementing specifications using whatwg streams api use counters logging native keyboard and ime event handler behavior editor editor module structure editor module specific rules ime handling guide style system css layout style system overview layout overview dynamic change handling along the rendering pipeline layout engine visual tests reftest layout code reviewer checklist layout debugger accessiblecaret graphics rendering overview layers history asynchronous panning and zooming silk overview moz2d processes threads and ipc ipdl inter thread and inter process message passing gecko processes shutdown handling of processes utility process firefox devtools contributor docs automated tests files and directories tool architectures frontend backend performance preferences recurring tasks toolkit profiles service javascript logging add on manager autocomplete background task mode crash manager crash reporter internal urls search service shield recipe client nimbus messaging system schemas picture in picture prompts subprocess module telemetry firefox on glean fog toolkit modules toolkit widgets fingerprinting resistance url classifier webextensions api development managing the built in en us dictionary application update anti tracking translations session store spidermonkey building and testing spidermonkey running automated javascript tests hacking tips debugger api savedframe javascript language feature checklist so you want to add a bytecode op adding use counter telemetry to the js engine components of spidermonkey js loader system modules js loader apis geckoview documentation more information fenix acronym dictionary addressing a performance regression architecture decisions architecture overview crash monitoring creating a release branch data practises development test plan fennec legacy migration firebase cloud messaging for webpush firefox for android team processes home implementing telemetry implementing a nimbus experiment list of fenix threads logging crash information metric feature tags debug settings menu instructions telemetry implementation reviews renewals creating glean annotations data review renewing existing telemetry test telemetry pings working with strings adjust certificates crash reporting experiments manual testing metrics definitions release checklist startup performance substituting local geckoview sync integration tests telemetry ui tests focus for android architecture decisions battery debugging content blocking crash reporting with sentry development custom geckoview feature issue workflow running geckoview in a debug environment home homescreen tips multisession architecture recommended pre push hook release process release tracks removing strings sprint process telemetry ui test webidl overview webidl source file flavors producing c code requirements libpref high level design low level details networking how to s tutorials deep dives references remote protocols common documentation protocols architecture bugs communication services remote settings sync permissions permission manager remote permissions file handling uri loader service external helper app service firefox on macos using macos apis a primer on macos sdks firefox on windows windows dll blocklisting windows pointing device support in firefox windows limited access features firefox ai runtime architecture apis notifications models management how to perftest a model webextensions ai api accessibility architecture document accessibility lifecycle geckoview thread topography colors and high contrast mode hcm settings high contrast mode hcm media queries media playback mediaformatreader code quality static analysis linting coding style typescript writing rust code basics rust c interop rust update policy xpcom components in rust rust components topic guides api references developing rust components uniffi bindgen gecko js developers guide gecko profiler profiler code overview buffers and memory management instrumenting javascript instrumenting rust instrumenting android markers profiling memory profiling sandbox violations linux performance general performance references memory profiling and leak detection tools profiling and performance tools power profiling performance metrics database bindings sqlite kv xpcom consuming xpcom functionality tooling around xpcom writing new xpcom interfaces classes nspr documentation getting nspr community related topics network security services nss web security checks in gecko key concepts and terminology loading lifecycle in firefox security checks during loading the firefox build system mach pushing to try build system firefox ci and taskgraph managing documentation vendoring third party components testing test infrastructure automated testing understanding treeherder results sheriffed intermittent failures turning on firefox tests for a new configuration avoiding intermittent tests debugging intermittent test failures testing policy configuration changes browser chrome mochitests chrome tests marionette geckodriver test verification webrender tests mochitest xpcshell tests tps web platform tests gtest fuzzing sanitizer performance testing code coverage testing debugging rust code ai agent tools ai agent tools for firefox development releases updates mozilla update infrastructure watershed updates desupport updates update verify localization internationalization internationalization locale management ui internationalization icu icu4x localization localization fluent migrating strings from legacy or fluent files single localization source for multiple builds l10n glossary firefox and python mozbase using third party python packages metrics collected in firefox metrics indices and tables index module index search next built with sphinx using a theme provided by read the docs