«  Firefox 161 beta cycle 

Uplifts by Product
95 uplifts

  1. OOM | small (23.19%) Known top crash
  2. OOM | large | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (11.24%) Top crash 2071620
  3. nsThreadPool::PutEvent (2.56%) 2015433
  4. mozilla::dom::quota::QuotaManager::Shutdown::<T>::operator() (2.38%) 2069097
  5. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (2.26%) 2022780
  6. js::gc::HeaderWord::get (2.26%) 2061080
  7. EnterJit (1.90%) 1848584
Uplifts and Backouts
Bug Component Summary
1916860 Layout Perma layout/inspector/tests/test_isUsedColorSchemeDark.html | single tracking bug
2079668 Widget: Gtk [Wayland] Firefox UI freezes when the WebAuthn security key prompt appears (AMD radeonsi, hardware WebRender)
2083966 Machine Learning: Frontend [Smart Window] Add Account Signin link to temporarily unavailable message
2084491 General Crash in [@ java.lang.IllegalStateException: at org.mozilla.geckoview.GeckoResult.complete(GeckoResult.java)]
2085361 Messaging System Resolution reason, completion status (completed/skipped/expired), and completion count are not included in the "DISMISS" messaging-system ping when the card stack is dismissed
2087441 Task Configuration reduce how long decision tasks wait for bugbug
2087787 CSS Parsing and Computation store.google.com - When clicking a link of navigation menus on that page, it takes a very long time for the linked page to load.
2088158 Widgets Move Wrexham widget strings out from newtabPreview.ftl to newtab.ftl
2088509 Address Bar Use the regular zero prefix layout and result count when no temporal suggestions are shown
2088856 Untriaged browser_ext_slow_script.js fails with "stopButton is null" and then hangs until the task's max run time
2089066 UI Tests Intermittent failure in verifyLongTapShortcutDisplaysEditShortcutTest: Simple toolbar share button not found
2089261 DOM: Core & HTML Perma [tier 2] macOS shipp /html/semantics/embedded-content/media-elements/autoplay-with-broken-track.html | <video autoplay> with <track src="" default=""> child - expected TIMEOUT
2089620 Experimentation and Telemetry Register Nimbus targeting context ping during Fenix startup
2089997 DOM: Security Trusted Types telemetry needs to distinguish top level documents from frames
2088688 Other …
2089704 Other …
2059999 Other …
2076000 Other …
  1. OOM | small (22.75%) Known top crash
  2. OOM | large | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (12.35%) Top crash 2071620
  3. js::gc::detail::ChunkPtrHasStoreBuffer (2.39%) 1980548
  4. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::Nursery::maybeMoveRawBufferOnPromotion (1.83%) 1472062
  5. js::gc::HeaderWord::get (1.77%) 2061080
  6. OOM | large | alloc::raw_vec::handle_error (1.65%) 1906769
  7. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (1.65%) 2022780
Uplifts and Backouts
Bug Component Summary
2087803 Messaging System Outro animation is slow and jumps at the end
2087822 CSS Transitions and Animations [scroll-animations] timeline-scope on ::before/::after is recorded against the originating element instead of applying to the pseudo-element
2089043 Graphics: Canvas2D [Linux/Wayland] DMABuf WebGL color corruption still present in Firefox 159.0.1 on Intel UHD 730
2089207 Messaging System CTAParagraph link fires on keyup from Enter key pressed before spotlight had focus
2089222 Messaging System Use full-width buttons at smallest card-stack breakpoint
2089888 Task Configuration Permanent docker-image-android-ui-tests "ca-certificates-java : Depends: ca-certificates (>= 20260816ubuntu0.22.04.2) but 20260816ubuntu0.22.04.1 is to be installed"
2089905 Task Configuration Fortify code added in bug 2084865
2089913 General Perma docker image [taskcluster:error] exit status 1 | E: Held packages were changed and -y was used without --allow-change-held-packages.
2090281 New Tab Page FramedWidgetsFeed cache lifetime should be much shorter
2090333 Widgets Padded moz-widget cards have too large of a gap between the header and content
2082119 Other …
2058620 Other …
2029718 Other …
2053674 Other …
2078599 Other …
2079922 Other …
2075411 Other …
2090902 Other …
2089890 Other …
2088670 Other …
2090118 Other …
2085481 Other …
2079465 Other …
2088537 Other …
2090147 Other …
  1. OOM | small (21.89%) Known top crash
  2. OOM | large | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (8.63%) 2071620
  3. js::gc::detail::ChunkPtrHasStoreBuffer (3.58%) 1980548
  4. mozilla::dom::TimeoutManager::RescheduleTimeout (2.74%) 1843369
  5. XREMain::XRE_main (2.53%) 2077967
  6. EnterJit (2.11%) 1848584
  7. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (1.89%) 2022780
Uplifts and Backouts
Bug Component Summary
2072398 DOM: Animation [scroll-animations] Named scroll-timeline lookup blocks the main thread for minutes when many elements share one timeline name
2074521 Networking A fetch() upload from a ReadableStream is buffered in memory in its entirety
2080094 Graphics: Text Debug crashtests on macOS 10.15 report leaked FontData in content processes
2083276 Audio/Video: Playback Perma /encrypted-media/drm-mp4-playback-temporary-clear-encrypted.https.html | single tracking bug
2085373 Disability Access APIs Crash in [@ mozilla::a11y::DocAccessible::IPCDoc]
2086565 Startup and Profile System Record whether the underlying machine changed during downgrade
2087261 Widget: Cocoa macOS: Expanded native select popup left-aligns RTL option labels
2087583 Storage: Quota Manager InitQuotaForOrigin sets metadata dirty without initializing last modified time
2087584 Storage: Quota Manager FlushDirtyOriginInfos loses entries when IsOriginInitialized is false
2087938 Graphics Crash in [@ mozilla::layers::SharedSurfacesParent::ExpireMap]
2088486 Layout Crash in [@ mozilla::detail::InvalidArrayIndex_CRASH | nsTArray_Impl<T>::ElementAt | nsTArray_Impl<T>::operator[] | mozilla::dom::StyledRangeCollection::GetAbstractRangeAt]
2088877 Machine Learning: Frontend Perma browser/components/aiwindow/models/tests/browser/browser_prompt_loader_chat_system_prompt.js | test_buildChatSystemPrompt_uses_manifest_order - # Pages (generate_page) appears in manifest order - -1 > 9562 when Gecko 161 merges to beta on 2026-11-05
2089206 Networking: HTTP Thunderbird tests failure in netwerk/test/unit/test_http3_with_proxy.js | test_multiple_requests
2089593 General Crash in [@ java.lang.RuntimeException: at android.app.ActivityThread.performResumeActivity(ActivityThread.java)]
2089681 CSS Parsing and Computation Let TypedOM run the trains.
2090259 Startup and Profile System Perma [tier 2] MinGW /builds/worker/checkouts/gecko/toolkit/xre/nsAppRunner.cpp:X:45: error: use of undeclared identifier 'PT_ROAMING_PREEXISTING'
2091233 General Optimize requestUiThreadCallback
2091550 IP Protection Use generic error for VPN_UNAVAILABLE
2091596 Graphics: Canvas2D PDF renderer showing blank or incomplete pages
2091597 Downloads Panel Quit pop-up for downloads has uninterpolated text
2092200 Tooling Enable reinstalls feature by default in all channels
2091273 Other …
2089582 Other …
2080132 Other …
2091445 Other …
2089267 Other …
2089775 Other …
2090289 Other …
2084649 Other …
2090109 Other …
2080097 Other …
2091272 Other …
2084816 Other …
2068592 Other …
2090172 Other …
2088854 Other …
2073679 Other …
Uplifts and Backouts
Bug Component Summary
1986173 Session Restore Quitting the browser while a search query is in flight causes a session to be restored in an incomplete and broken manner
2091728 Printing: Output PDF Viewer prints thin lines with way too much thickness, with Skia GDI (Brother MFC-L8390CDW series)
2092509 Contextual AI Add Listen to Page to Secret Settings in Beta
2092532 Networking: HTTP WebTransport datagram write() promises never settle once neqo queues a datagram above its high water mark, stalling datagrams.writable
2092632 RelOps: Windows OS Update Windows worker images to 2026.11.12 (ronin_puppet 0a82cf0) and Ubuntu 24.04 images to 2026-11-12
2089774 Other …
2091136 Other …
2078279 Other …
2089819 Other …
2090182 Other …
2089592 Other …
2090592 Other …
2088644 Other …
2089680 Other …
2079172 Other …