«  Firefox 151 beta cycle 

Uplifts by Product
391 uplifts

  1. OOM | small (8.62%) Known top crash
  2. shutdownhang | mozilla::SpinEventLoopUntil | nsThreadPool::ShutdownWithTimeout (8.62%) 1866944
  3. nsWindowWatcher::OpenWindowInternal (5.17%)
  4. AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot' (3.45%) 1877111
  5. ExecuteHandler2@20 (3.45%) 853856
  6. OOM | large | __rustc::__rust_alloc_error_handler (3.45%)
  7. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::StoreBuffer::MonoTypeBuffer<T>::sinkStore (3.45%)
Uplifts and Backouts
Bug Component Summary
1964551 Netmonitor Intermittent devtools/client/netmonitor/test/browser_net_overrides_with_debugger.js | single tracking bug
2030296 Audio/Video: Playback [Win10] Netflix videos not rendered on HDR enabled display
2030461 DOM: File Tab crash after drag-and-dropping and reading nested folder structure
2030466 Top Sites Crash in [@ java.lang.IllegalArgumentException: at mozilla.components.browser.icons.extension.IconMessageKt.toJSON(IconMessage.kt:177)]
2031958 Audio/Video: Playback media/ffvpx/libavcodec/parsers.c:114:30: error: initialization of ?const FFCodecParser *? from incompatible pointer type
2032173 IP Protection Dismiss infobar and in-panel warnings in all windows if dismissed in active window
2032181 Browser Engine [Shake to Summarize] Use page title as the title of the summary
2032196 Address Bar Search mode switcher no longer respects density settings
2032648 Address Bar Sports suggestions: Add cricket, golf, racing, and soccer fallback icons and improve sport-to-fallback-icon mapping
2032980 DOM: Core & HTML It's too easy to miss the "press and hold esc" text in the fullscreen keyboard lock message
2033134 UI Tests Perma [tier 2] mozilla.components.lib.crash.service.GleanCrashReporterServiceTest#gleanCrashReporterServiceReadsExtras | org.junit.ComparisonFailure: expected:<[d462c4b4-a9f8-4244-b526-7435fcdc4403]> but was:<[a7b9a249-a4d6-4f26-bb8b-99dcfd6b27ce]>
2033165 New Tab Page Nova content feed layout does not render four column layout
2033171 DOM: Core & HTML Perma /html/syntax/parsing/crashtests/reconstruct-active-formatting-elements-001.html | single tracking bug
2033253 Search Perma a11y-checks [tier 2] browser/components/search/test/browser/telemetry/browser_search_telemetry_sources.js | test_source_searchModeSwitcher - Node is not accessible via accessibility API: id: | single tracking bug
2033339 Tabs Deleting a tab always scrolls to the selected tab
2033346 New Tab Page Nova customization panel - Fix wallpapers alignment when panel is open
2033385 WebDriver BiDi Requesting the Geolocation now opens the system preferences on macOS since April 20th, 2026
2033498 UI Tests Temporarily disable verifyUBlockWorksInNormalModeTest & verifyUBlockWorksInPrivateModeTest for frequent failures
2033530 Release Automation RuntimeError: Cron jobs ['run-missing-tests'] couldn't be triggered properly. Reason(s): * "run-missing-tests": "'schema'"
2033691 Accessibility Tools Temporarily delay toolbox opening for accessibility panel tests
2033705 DOM: Core & HTML Consider to have a longer timer value for Fullscreen warning autohide when keyboard is locked
2028537 Other …
2033602 Other …
2031921 Other …
2031028 Other …
2032427 Other …
  1. webrender::picture::_::impl$3::eq (28.01%) Top crash
  2. alloc::vec::Vec<T>::push_mut (25.00%) Top crash 2031107
  3. memcpy | alloc::vec::Vec<T>::append_elements (6.25%)
  4. shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads (4.17%) 1524247
  5. OOM | small (2.08%) Known top crash
  6. core::str::iter::impl$0::next (1.85%)
  7. stackoverflow | PredictorAdd1_AVX2 (1.85%)
Uplifts and Backouts
Bug Component Summary
2026849 Shell Integration Metrics for Windows Search navigations
2029237 Machine Learning: Frontend Disable smart cursor interaction
2029505 IME GBoard gestures (cursor control/swipe-to-delete) fail to work on DuckDuckGo search input in Firefox for Android
2029616 Browser Engine [Shake to Summarize] Error message UI does not match Figma design
2030034 Address Bar Intermittent browser/components/urlbar/tests/engagementTelemetry/browser/browser_glean_telemetry_engagement_window.js | single tracking bug
2031544 IP Protection Show site exclusion confirmation hint once per excluded site
2031669 New Tab Page Customize this page pencil button is not displayed according to the nova figma design
2032227 IP Protection Add an IPP locations subview
2032605 IP Protection Add conditional attention dot to IP Protection toolbar button
2033073 Networking Secure Connection Failed when loading wikipedia.com
2033198 DOM: Security Perma [tier2] wpt backlog | TEST-UNEXPECTED-PASS /upgrade-insecure-requests/gen/iframe-blank-inherit.meta/unset/iframe-tag.https.html
2033279 General Unable to compile SpiderMonkey using Rust 1.95.0
2033313 Toolbar "Fill link from clipboard" appears with transparent background
2033384 Layout congresoseed.com - Page header does not have a fixed position and disappears when scrolling
2033427 UI Tests Temporarily remove the verifyExtensionsButtonWithInstalledExtension test step
2033611 Nimbus Desktop Client Firefox Labs opt-in list cleared at first startup
2033732 DOM: Editor Contenteditable is not editable when inside <output> element
2033840 DOM: Navigation Extend GWT RichTextArea compat hack to the Editor version in Polarion
2034098 New Tab Page Adjust Sponsored tile character count
2027247 Other …
2030747 Other …
2028526 Other …
2033854 Other …
  1. OOM | small (9.70%) Known top crash
  2. shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads (9.70%) 1524247
  3. XREMain::XRE_main (5.45%) 1928888
  4. AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot' (4.85%) 1877111
  5. OOM | large | NS_ABORT_OOM | nsTSubstring<T>::AllocFailed | AppendUTF16toUTF8 | NS_ConvertUTF16toUTF8::NS_ConvertUTF16toUTF8 | mozilla::dom::serviceWorkerScriptCache::(anonymous namespace)::CompareManager::WriteToCache(JSContext*, mozilla::dom::cache::... (4.85%) 2037258
  6. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (3.64%) 2022780
  7. js::gc::detail::ChunkPtrHasStoreBuffer (3.64%) 1980548
Uplifts and Backouts
Bug Component Summary
1876948 DOM: Core & HTML Intermittent /html/dom/render-blocking/remove-attr-stylesheet-link-keeps-blocking.html | single tracking bug
2021973 Machine Learning: Frontend implement "Search With" submenu for Smartbar CTA button dropdown
2027911 Homepage When tapping Private Browsing button on home-screen, the homescreen UI jumps upwards for a moment (causing visual jitter and possible mis-directed taps)
2029229 Machine Learning: Frontend Enable back/forward navigation across Smart Window states
2029378 Toolbar Datepicker dialog causes Firefox canvas to go off screen on "notch" phones
2030045 New Tab Page Incorrect card type detection in telemetry for small and large cards if NOVA is enabled
2030209 New Tab Page Refactor weather error message state for Nova
2030210 New Tab Page Refactor weather location search UI for Nova
2031707 New Tab Page The Weather checkbox in about:preferences#home is not synchronized with the Weather widget toggle in the Customization Panel
2033055 UI Widgets "Update Add-ons Automatically" menu item does not have checkmark any more
2033231 Address Bar Middle clicking alternate engines no longer perform a search on the current search bar text in a new tab
2033269 DOM: Events Perma macos wpt backlog [tier 2] /pointerevents/touch-action-with-swipe-dir-change.html | touch-action:auto with down,right swipe - Test timed out | single tracking bug
2033469 Layout: Form Controls Autoscroll ignores textarea and scrolls the enclosing element
2033775 Machine Learning: General AIChatMessage#isSettingsURL throws a runtime error when parsed url is null
2034120 Geolocation Provider Rejecting to enable system permission does not stop the browser to show system permission on a second attempt
2034122 Machine Learning: Frontend The Ask a chatbot option is displayed when the user right clicks inside the Ask Assistant sidebar
2034141 Experimentation and Telemetry Incorrect ping for attribution data specified in metrics yaml
2034190 Security: PSM Upgrade Firefox 151 to NSS 3.123.1
2034530 Experimentation and Telemetry Third party sharing configuraiton should be done before Adjust SDK initialization
2027154 Other …
2029814 Other …
2028886 Other …
2029899 Other …
2023657 Other …
2027308 Other …
2029463 Other …
2029325 Other …
2024439 Other …
  1. shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads (15.00%) Top crash 1524247
  2. OOM | small (6.67%) Known top crash
  3. AsyncShutdownTimeout | profile-before-change | Sqlite.sys.mjs shutdown blocker (5.00%) 2009476
  4. NS_CycleCollectorSuspect3 | nsCycleCollectingAutoRefCnt::decr (5.00%) 2036484
  5. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (4.17%) 1472062
  6. js::gc::ChunkMarkBitmap::markIfUnmarkedThreadSafe (4.17%) 1974595
  7. shutdownhang | mozilla::SpinEventLoopUntil | nsThreadManager::SpinEventLoopUntilInternal (4.17%)
Uplifts and Backouts
Bug Component Summary
2030296 Audio/Video: Playback [Win10] Netflix videos not rendered on HDR enabled display
2031688 Inspector: Rules @container "select container" button is hard to click , tooltip is getting in the way
2031802 IP Protection Add location selection button to VPN panel
2031807 IP Protection Add "NEW" badge to location selection button in VPN panel
2031968 Networking: DNS Potential deadlock in DNS resolution
2032452 Profile Backup Enable fxbackup on all platforms
2032512 JavaScript Engine Assertion failure: !js::UninlinedIsCrossCompartmentWrapper(this), at /builds/worker/checkouts/gecko/js/src/vm/JSObject.h:437
2032644 Netmonitor Intermittent devtools/client/netmonitor/test/browser_net_sse-basic.js | single tracking bug
2033138 IP Protection Location button in main panel opens location picker subview
2033147 DOM: Web Authentication WebAuthn getClientCapabilities should return true for largeBlob on android
2033504 Relay Firefox Relay CFR - Mask Expansion (Fix)
2033505 IP Protection Update strings for VPN section in about:settings
2033782 Inspector: Rules @container tooltip text doesn't have enough contrast in dark mode
2034283 Graphics: WebRender transform-style: preserve-3D does not preserve as expected in vers. 150+
2034531 Task Configuration run full set of mozilla-beta tasks every 3 hours
2034573 Layout: Form Controls input element's default string value is shifted down
2034620 New Tab Page Fix critical UI issues with Lists and Timer Widgets
2034653 Performance Revert 1979760 for metrics regression
2034761 DOM: Security Perma backlog [tier 2] mozilla-beta /upgrade-insecure-requests/gen/srcdoc-inherit.meta/unset/iframe-tag.https.html | Upgrade-Insecure-Requests: Expects blocked for iframe-tag to cross-https origin and downgrade redirection | single tracking bug
2027209 Security Increase error code visibility on net error pages
2029697 Preferences about:preferences default-browser "kit" images (kit-concerned.svg/kit-happy.svg) cause layout shift on first load of preferences page
2030964 WebDriver BiDi log.entryAdded lacks error message in `text` in nightly
2031820 DOM: Bindings (WebIDL) Assertion failure: mDefinition->mConstructionDepth == mDefinition->mPrefixStack.Length(), at /builds/worker/checkouts/gecko/dom/bindings/BindingUtils.cpp:3796
2032054 Onboarding Display notification card regardless of “Set as default browser” prompt response
2033180 Graphics: Color Management [HDR/Windows] Gracefully fall back on BT2100 HLG failures in VideoProcessorBlt
2033188 DOM: Device Interfaces nightly fails to compile with: ../../../firefox-151.0/dom/webserial/PosixSerialPlatformService.h:59:10: error: 'gboolean' does not name a type
2033567 Tabs Visual jank when opening the tab manager
2033640 Audio/Video: Playback [wmfme] Fix MF_E_INCOMPATIBLE_SAMPLE_PROTECTION (0xC00D7176) error
2034178 Untriaged Facebook does not open in Firefox 150.0 (HTTP/3 stalled by endpoint protection?)
2034245 Build Config Make source-package more product neutral
2034329 Untriaged Accessing ancestorOrigins in extension breaks websites (Gmail) that reads ancestorOrigins
2034395 Audio/Video: GMP Crash in [@ nsIEventTarget::Dispatch]
2034481 General Fenix crashes on launch on Automotive emulator API 33
2034752 Networking: HTTP on-premise azure devops no longer works with firefox 150
2034980 PDF Viewer Can't highlight image scans in Firefox 150+
2034989 Layout Use UniquePtr to manage TextOverflow objects in nsBlockFrame::BuildDisplayList to save some stack space
2034791 Other …
2029770 Other …
2033270 Other …
2029447 Other …
2029785 Other …
2030323 Other …
2032043 Other …
2033850 Other …
2032631 Other …
2028005 Other …
2032042 Other …
2032604 Other …
1983677 Other …
2027883 Other …
  1. <unknown in xul.pdb> (15.00%) Top crash 1970429
  2. alloc::vec::Vec<T>::push_mut (11.56%) Top crash 2031107
  3. shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads (8.75%) 1524247
  4. OOM | small (7.81%) Known top crash
  5. AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot' (2.19%) 1877111
  6. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (2.19%) 1472062
  7. mozilla::dom::NavigationWaitForAllScope::CommitNavigateEventSuccessSteps | mozilla::dom::Navigation::RunNavigateEventHandlerSteps::<T>::operator() (2.19%) 2024044
Uplifts and Backouts
Bug Component Summary
2020866 Tabbed Browser: Tab Groups Add new key to tabgroup.group_interactions metric to measure the usage of copy all links function
2021258 Performance Engineering Use NDK AChoreographer for vsync on Android
2021345 DOM: Device Interfaces Move WebSerial reads to a separate thread for performance/power reasons
2023696 Installer Replace the desktop shortcut with the desktop launcher when Firefox is installed via the full installer
2023797 Design System and Theming Update info and promo cards to latest Acorn designs
2025637 Autofill Crash in [@ java.lang.RuntimeException: at android.view.autofill.AutofillManager.isAutofillSupported(AutofillManager.java)]
2028843 Graphics: Color Management [HDR] Combine the various prefs that enable HDR video and add a force_enabled pref for testing on non-HDR displays (especially useful for reftests probably)
2029240 Profile Backup Local Firefox backup fails every time
2029561 Site Reports www.vans.cl - Page fails to load and crashes the browser (Android)
2030772 Sidebar Intermittent [TV] browser/components/sidebar/tests/browser/browser_bookmarks_keyboard_navigation.js | test_arrow_up_enters_previous_expanded_folder - Test timed out
2030782 Machine Learning: Frontend keyboard selecting smartbar suggestion fails to chat or performs original query's chat intent
2030873 New Tab Page Nova customization panel - Add in wallpaper toggle reset functionality
2030988 Sidebar Intermittent browser/components/sidebar/tests/browser/browser_bookmarks_keyboard_navigation.js - test_arrow_down_from_last_row_to_next_folder - Test timed out | single tracking bug
2031686 IP Protection Expose the Server/Country Model to UI
2031687 IP Protection Allow Passing the preferred CountryCode in IPPProxyManager.start()
2031818 Homepage Add UI components for building the Homepage Sports Widget
2031881 XPCOM Consider adding nsIAsync{Input,Output}Stream implementations for OS pipes
2032328 JavaScript: GC FinalizationRegistries and WeakRefs are not updated after transplanting
2032544 Messaging System Add nimbus targeting attribute for first-run enrollment on mac, linux, msix
2032973 Address Bar Typing something in the urlbar and clicking an engine in the unified search button popup records a urlbar abandonment event
2032991 Address Bar Don't perform search when adding a new engine from search engine switcher
2032998 Machine Learning: Frontend Memories Onboarding Card
2033135 IP Protection Add moz-promo to ipprotection-locations wrapper
2033146 IP Protection Implement country list for location picker subview
2033616 IP Protection Get countries list for IPProtectionPanel state
2033621 IP Protection Pass country code to IPProtectionPanel from locations component when a location is selected
2033669 Homepage Add error info cards for the Homepage sports widget
2033682 Homepage Add a "Follow another team" banner for the Homepage Sports Widget
2033804 IP Protection Create an IPProxyManager::switch function.
2033843 Settings UI Broken privacy settings with snap package due to failure to load AppUpdater module
2033862 Address Bar "New" badge doesn't show anymore on new built-in engines in the search mode switcher
2033927 New Tab Page Newtab Nova privacy link color and focus styling fix
2033930 Homepage Add settings UI for toggling the Homepage Sports Widget
2033931 Installer Perma mingw [tier 2] /builds/worker/checkouts/gecko/toolkit/mozapps/update/common/EnterprisePolicies.cpp:X:10: fatal error: 'Windows.h' file not found | single tracking bug
2034041 DOM: Events Fullscreen keyboard lock checks are wrong in presence of Shadow DOM.
2034336 General Potential issues with edge-to-edge support applying too big paddings to screens
2034350 Address Bar Show both teams' icons in sports suggestions
2034521 Homepage Add Countdown PromoCard for the Homepage Sports Widget
2034535 Homepage Add the latest round of string changes for the Homepage Sports Widget
2034575 IP Protection Alphabetically sort country list in location picker
2034652 Homepage Add a card for following your team in the Homepage Sports Widget
2034664 Homepage Implement the entry flow of Homepage Sports Widget
2034688 New Tab Page Nova customization panel - Add in wallpaper check to the new toggle logic
2034722 WebRTC: Audio/Video Regression between 149.0.2-1 and 150.0-1 cannot use v4l2loopback based webcam: USER_FORBIDDED_CAPTURE_VIDEO Error: Video loadedmetadata timeout 3 with canon EOS as webcam
2034798 Graphics Refactor blocklist macros to prevent allowlist statuses with non-allowlist features
2034868 Homepage Add a11y content description strings for the Homepage Sports Widget
2034897 Layout: Images, Video, and HTML Frames contain: size image ignores aspect ratio from width/height attributes
2034912 New Tab Page Nova - UI updates to daily briefing 3-pack card
2034962 Tabs Tab closed info toast overlaying last tab in tab list
2035009 Migration panel-list items in the migration wizard are vertically misaligned
2035030 Homepage Restore content of sports_widget_match_full_time
2035094 Homepage Persist the selected country in the Homepage Sports Widget
2035145 Toolchains Perma [tier 2] Windows MinGW ld.lld: error: undefined symbol: FOLDERID_ProgramFilesX86
2035214 Installer Installing/Uninstalling the full installer twice leaves both the desktop shortcut and the Desktop Launcher on the desktop
2035255 Machine Learning: Frontend Memory generation should wait for firstrun onboarding completion
2035322 Address Bar Update sports suggestions l10n string for scheduled games
2035355 Themes Duplicated panel shadows on macOS after bug 1988296
2035370 Widget: Cocoa macOS Tahoe renders inner shadow rim for panels, affecting border color
2035666 Graphics: ImageLib disable libwebp avx2 support temporarily
2035801 Security: PSM Disable the pref security.ssl3.ecdhe_ecdsa_aes_128_sha for release
2034119 Other …
2029732 Other …
2029894 Other …
2029428 Other …
2025956 Other …
2034837 Other …
2022722 Other …
2027159 Other …
2033275 Other …
2034978 Other …
2035209 Other …
2028579 Other …
  1. <unknown in xul.pdb> (13.92%) Top crash 1970429
  2. OOM | small (13.92%) Known top crash
  3. shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads (11.33%) Top crash 1524247
  4. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (4.85%) 1969401
  5. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (3.24%) 1472062
  6. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (2.91%) 2022780
  7. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::Nursery::maybeMoveRawBufferOnPromotion (2.59%) 1472062
Uplifts and Backouts
Bug Component Summary
2035665 DOM: Core & HTML user-agent shadow root returned from element.openOrClosedShadowRoot unexpectedly
2028676 Machine Learning: Frontend [a11y] Answer to user's question not obvious to screen reader users
2029220 Machine Learning: Frontend Reduce unwanted sidebar auto-open via adaptive behavior
2030728 Toolbar Crash in [@ java.lang.StringIndexOutOfBoundsException: at java.lang.String.charAt(Native Method)]
2032568 Machine Learning: Frontend Panel list items in smart window have invisible text when hovering an item in High Contrast Mode
2032640 Sync Add ineligible flow in avatar/hamburger menus
2033458 Audio/Video: Playback Crash in [@ java.lang.ArrayIndexOutOfBoundsException: at androidx.media3.exoplayer.trackselection.BaseTrackSelection.isTrackExcluded(BaseTrackSelection.java)]
2033882 IP Protection Update VPN panel loading state
2034577 IP Protection Ensure correct keyboard navigation order for location picker subview
2035353 Address Bar Rich search suggestion icons are forced into a square aspect ratio
2035479 Messaging System Barely legible text (very low contrast) for "Firefox Relay" callout dialog (RELAY_SURVEY_SCREEN)
2035536 New Tab Page Make enabling HNT Nova at runtime less janky
2035620 Audio/Video: Playback [wmfme] More error handling for PlayReady
2035681 Layout: Form Controls The caret is displayed on the left edge, regardless of the `text-align` value when the placeholder is visible
2035944 IP Protection Add metrics for IPP location picker
2036148 Machine Learning: Frontend Don't show sidebar auto-open pref prompt if auto-open by default set to false
2036172 New Tab Page Fix Nova color tokens not being inherited by reusable components in New Tab
2034352 Other …
2033637 Other …
2025940 Other …
2027288 Other …
2034422 Other …
2035880 Other …
2028266 Other …
2035879 Other …
2035966 Other …
1784128 Other …
  1. alloc::vec::Vec<T>::push_mut (30.24%) Top crash 2031107
  2. webrender::picture::_::impl$3::eq (14.43%) Top crash
  3. memcpy | alloc::vec::Vec<T>::append_elements (8.27%)
  4. shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads (7.35%) 1524247
  5. OOM | small (4.50%) Known top crash
  6. arena_dalloc | BaseAllocator::free | MozJemalloc::free | PageFree (2.48%)
  7. webrender::render_task::RenderTask::get_target_rect (2.02%)
Uplifts and Backouts
Bug Component Summary
2033073 Networking Secure Connection Failed when loading wikipedia.com
2011921 DOM: Navigation Crash in [@ mozilla::dom::BrowsingContextWebProgress::ContextReplaced]
2017712 Networking: HTTP Firefox shows LNA prompts more eagerly than Chrome does, when there's a network hiccup that causes DNS to think public servers are at your local router address
2024146 Networking TLS session resumption tokens not persisted to storage
2026258 Widget: Gtk [Wayland] Right Click and Menu Popups not Rendering
2027903 Translations AI Controls: Add SUMO links to learn more buttons
2030005 Machine Learning: Frontend Conversation starters no longer work / 429 excessive uncached or duplicate requests
2030179 PDF Viewer Enable merging PDFs in Release
2031825 IP Protection Add subheading under location selection button in VPN panel
2031956 CSS Parsing and Computation range style query condition's query property gets extra parenthesis
2033285 History When Browsing history is selected in Delete browsing data on quit, open tabs are also cleared
2033882 IP Protection Update VPN panel loading state
2033953 General Perma macos [tier 2] devtools/server/tests/browser/browser_canvasframe_helper_04.js | Uncaught exception in test - TypeError: target.addEventListener is not a function | single tracking bug
2034379 Homepage Implement the Countdown functionality for Homepage Sports Widget
2034823 JavaScript: Internationalization API Update to tzdata2026b
2035104 Homepage Align Homepage Sports Widget data types with the API schema
2035109 Homepage Update SportCardHeader to align with the latest designs
2035112 Layout When the page zoom level is not 100%, the position of the drop-down list shifts
2035114 Homepage Implement the MatchCard component to be display in the Homepage Sports Widget
2035525 Application Update [macOS] Firefox remains in update state and cannot be launched afterwards on a standard macOS profile
2035530 PDF Viewer PDF Viewer Highlighter Tool doesn't work Freehand anymore, only when selecting Text
2035720 Homepage Add the MatchCardState to SportsWidgetState to handle displaying a MatchCard
2035767 Homepage Implement telemetry for Phase 1 - Showing the countdown card
2035836 WebRTC: Networking Unable to establish video conference audio connection
2035842 Relay Firefox Relay CFR - CTA Button Navigation
2035945 Sync Update "Send to device/Send to mobile" element on avatar menu when signed out
2036022 UI Widgets panel-list with max-width becomes scrollable when overflowing
2036062 Performance Don't run perfdocs on non-nightly code-review runs
2036096 General Enable AI controls by default in all build types
2036121 Tabbed Browser Reloading multiple highlighted tabs with Reload toolbar button or reload shortcuts.
2036365 Graphics: WebRender Slow composites when using DComp. Time spent in NtFlipObjectAddPoolBuffer and ZwFlipObjectRemoveContent
2036479 IP Protection Remove borders from location buttons to match HCM spec
2036517 Layout: Form Controls <input type="number"> spin buttons ignore padding
2036597 Graphics: CanvasWebGL WebGl doesn't work in headless mode on macOS since Firefox 150
2036802 PDF Viewer Uplift patches related to the merge feature in beta
2036856 Experimentation and Telemetry Change active_first_day event for first run event
2037193 Experimentation and Telemetry Allow more marketing campaign users to opt in to marketing ToS
2033610 Other …
2027255 Other …
2025412 Other …
2024418 Other …
2034496 Other …
1883230 Other …
2035915 Other …
2034754 Other …
2029703 Other …
2029910 Other …
2027333 Other …
2028870 Other …
2031119 Other …
2034498 Other …
2034628 Other …
2035968 Other …
1806249 Other …
2036516 Other …
2036256 Other …
2036668 Other …
  1. shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads (23.18%) Top crash 1524247
  2. OOM | small (9.94%) Known top crash
  3. alloc::vec::Vec<T>::push_mut (6.16%) 2031107
  4. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (3.54%) 1472062
  5. webrender::picture::_::impl$3::eq (2.85%)
  6. memcpy | alloc::vec::Vec<T>::append_elements (2.27%)
  7. AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot' (1.86%) 1877111
Uplifts and Backouts
Bug Component Summary
2023572 General Tracking the update to NSPR 4.39
2025322 Graphics: Color Management [HDR/Windows] Enable HDR video on Windows in release
2028081 Graphics: CanvasWebGL startup [Ubuntu 22.04.5 LTS Nvidia] Crash in [@ _dlerror_run]
2028758 DOM: Navigation 9.23 - 4.57% cnn LastVisualChange + 1 more (Linux, OSX) regression on Wed March 25 2026
2030165 Graphics: Color Management [HDR/Windows] Allowlist HDR video on AMD/NVIDIA drivers as they support HLG transfer function
2030839 Netmonitor Intermittent devtools/client/netmonitor/test/browser_net_frame.js | single tracking bug
2031293 New Tab Page ASROUTER_NEWTAB_MESSAGE should use the same border radius as Shortcuts and content cards on the newtab
2033625 New Tab Page Update Widget Header/Menu code to use correct sizing option text
2034292 DOM: Core & HTML Fullscreen Keyboard Lock does not intercept ctrl+tab and keyboard events dispatched to chrome listeners
2034935 WebRTC Can't see remote participant in MS Teams unless they toggle their camera off and on
2035998 JavaScript: WebAssembly WebAssembly.Module.imports() hides polyfill imports and reflects wrong types when js-string builtins are enabled
2036192 Widget: Cocoa Add profile container App Group to production entitlements for Release and Beta channels
2036401 New Tab Page Newtab nova widgets should align with content and use the same breakpoints
2036484 DOM: Core & HTML Crash in [@ NS_CycleCollectorSuspect3 | nsCycleCollectingAutoRefCnt::decr] via PermissionStatusSink
2036835 Homepage Update View Schedule click action for the Homepage Sports Widget
2036952 New Tab Page Send Merino requests over HTTP for the weather widget
2037001 Homepage World Cup widget and Secret Settings option not translated and have broken RTL layout in Arabic locale
2037192 Homepage Add new string changes for the Homepage Sports Widget
2037281 New Tab Page Newtab widget context menu button isn't set properly for contrast fix
2037282 New Tab Page Newtab nova if a wallpaper is set, and then turned off, it won't come back on if the same wallpaper is selected again
2029571 Site Reports neuteringmarket.eu - "Fund" buttons are not working
2032367 WebExtensions Firefox Android chrome.tabs.query({windowType: 'normal'}) broken
2032599 IP Protection Update unauthenticated panel UI
2033397 DOM: Core & HTML Keyboard lock state isn't updated correctly, while top-level document goes into fullscreen (without keyboard lock) first then requesting fullscreen (with keyboard lock) on OOP iframe
2034952 Graphics: Color Management specific youtube short plays at less than 1 fps
2035205 Netmonitor devtools/client/netmonitor/test/browser_net_frame.js permafails on mac
2035734 Graphics: WebRender Box shadow renders incorrectly
2035885 Tabs Migrate TabManagementFragment from a DialogFragment to a Fragment
2035981 Sync Send Tab clicks from the app menu are misattributed to fxa_avatar_menu instead of fxa_app_menu
2035997 Homepage Add a Debug Tool for the Homepage Sports Widget
2036482 Widget: Cocoa [Cocoa] Have PointerLock use native APIs
2036730 Graphics: WebRender businesscard.wolfwings.us - Background grid animation is incorrectly played
2037072 Onboarding Don't show the review prompt if the continuous onboarding has not been completed
2037257 Messaging System Make asrouter-newtab-multistage component compatible with Firefox 151
2037367 Widget: Cocoa [Cocoa] mousemove event can contains an incorrect `buttons` value while pointer is locked with native API
2037500 Homepage Add new string changes for the Homepage Sports Widget
2037598 Address Bar Send Merino requests over HTTP for offline weather suggestions
2038224 Release Automation Ensure `release-partner-attribution` tasks use the correct `ja-JP` / `ja-JP-mac` dependency
  1. OOM | small (13.77%) Known top crash
  2. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (6.52%) 1472062
  3. shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads (6.27%) 1524247
  4. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (3.13%) 1969401
  5. OOM | large | NS_ABORT_OOM | nsTSubstring<T>::AllocFailed | AppendUTF16toUTF8 | NS_ConvertUTF16toUTF8::NS_ConvertUTF16toUTF8 | mozilla::dom::serviceWorkerScriptCache::(anonymous namespace)::CompareManager::WriteToCache(JSContext*, mozilla::dom::cache::... (2.27%) 2037258
  6. zlib_rs::deflate::State::d_code (2.19%) 1950764
  7. webrender::picture::_::impl$3::eq (2.06%)
Uplifts and Backouts
Bug Component Summary
2020990 Alerts Service Cannot unsubscribe from notifications via Windows 11 toast notification
2032239 Sidebar Record telemetry for events within sidebar panels
2037159 Address Bar Revert "Perform search when users enters text in urlbar and selects search engine"
2037361 Address Bar Middle click on "arrow" icon in the search bar doesn't open search in new tab
2037402 Settings UI Default Search Engine pop-ups auto select on initial click when the list is displayed above the button
2037430 Profile Backup Error when restoring a backup file from Mac/Linux in Windows
2037545 Memory Allocator High frequency macos gtest | test failed with return code -4 | single tracking bug
2037568 IP Protection Fix X button for tabs gettting bigger whenever location selector is rendered
2037671 IP Protection Remove info button in locations subview
2037803 DOM: Core & HTML A password characters are displayed in Print Preview and also printed
2037850 Translations `AppMenu > More tools > Translate...` remains available when browser.translations.enable is set to false
2037875 General BrowserUtils.formatURIForDisplay (including trust panel, full screen warning) always shows punycode due to use of eTLD service's getSchemelessSite
2037953 Relay Firefox Relay Doorhanger UX Upgrade - Mask Expansion, Update Title
2037980 Machine Learning: Frontend Instrument telemetry for Smart Window ↔ Classic Window switching and duration tracking
2038180 Interventions Ship keyboard lock intervention to websites that only support navigator.keyboard.lock
2029070 Other …
2034713 Other …
2036983 Other …
2036978 Other …
2038081 Other …
2028319 Other …
  1. OOM | small (16.58%) Known top crash
  2. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (8.51%) 1472062
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (3.64%) 1969401
  4. zlib_rs::deflate::State::d_code (2.61%) 1950764
  5. OOM | large | NS_ABORT_OOM | nsTSubstring<T>::AllocFailed | AppendUTF16toUTF8 | NS_ConvertUTF16toUTF8::NS_ConvertUTF16toUTF8 | mozilla::dom::serviceWorkerScriptCache::(anonymous namespace)::CompareManager::WriteToCache(JSContext*, mozilla::dom::cache::... (2.48%) 2037258
  6. EnterJit (1.90%) 1848584
  7. js::gc::HeaderWord::get (1.90%) 1993404
Uplifts and Backouts
Bug Component Summary
1936921 Bookmarks & History Intermittent browser/components/places/tests/browser/browser_sidebar_bookmarks_telemetry.js | single tracking bug
2031640 IP Protection Usage value separator inconsistencies between main panel and warnings/infobars
2032003 Machine Learning: Frontend The Ask dropdown Chevron is not visible with the Desert High Contrast theme
2032944 Site Reports poki.com - Game fails to fully load, stopping at 80% and blocking users from entering the game
2035425 Protections UI Clicking the Shield icon on the URL bar takes ~3seconds, spending time on QuotaManager I/O thread.
2035593 IP Protection Show catastrophic error screen when Guardian returns a 500 error.
2036023 Onboarding Enable Nimbus controlled experimentation with different marketing card layouts
2036352 New Tab Page Newtab nova the css switcher removal change broken tokens build
2036419 IP Protection Make locations subview scrollable
2036957 IP Protection Add a pref for IP Protection maxGb display
2037049 IP Protection The text below “Use VPN for this site” is missing
2037066 Messaging System The Smart Window Keep Closed Modal will not show the Blue keyboard focus ring for any button or frame
2037259 IP Protection Progress bar in the Settings VPN section is not equipped for RTL
2037266 Messaging System Onboarding splash screen targeting is not respecting experimentsGate pref
2037542 IP Protection Adjust updated keyboard navigation controls for VPN location selector
2037602 Machine Learning: General Load model metadata from RS rather than FALLBACK_MODELS constant
2037698 Graphics Netflix video is magenta and white when using WebRender (Software D3D11)
2037795 Experimentation and Telemetry Enable testing different marketing card variants
2037835 Homepage [a11y] When exiting the webview to homepage, the countdown is read although the search bar is focused
2037893 Homepage [L10n] The title of the sports widget overlaps the "x" button in Portuguese
2037934 Experimentation and Telemetry Allow messages to deeplink into AI Controls
2038266 Machine Learning: General Smart Window: add Merino World Cup tool call
2038282 DOM: Device Interfaces Make Web Serial support opt-in for enterprise policies
2038296 Homepage Add Group Stage string for the Homepage Sports Widget
2038454 Onboarding Create a temporary Nimbus flag to disable Marketing onboarding card
2038604 New Tab Page 13.25% perf_reftest_singletons insert-subtree-not-nth-edge-has-pseudo.html (OSX) regression on Fri May 1 2026
2039126 Graphics: Color Management [HDR/Windows] Disable HDR video on Windows in release
2036905 Other …
2036930 Other …
2038575 Other …
2038679 Other …
2037986 Other …
1860195 Other …
2038669 Other …
2036666 Other …

Last beta shipped

Uplifts and Backouts
Bug Component Summary
2030402 WebRTC Perma /webrtc/simulcast/h264.https.html | H264 simulcast setup with two streams - Test timed out
2038533 WebRTC Crash in DataChannel::AnnounceClosed
2038637 IP Protection [l10n] Link in the VPN Get Started panel displays on two rows causing UI issues in French locale
2038776 Experimentation and Telemetry Add glean events that track Adjust conversion events
2039028 IP Protection Introduce upgradeNotAvailable pref to gate upgrade buttons and messaging
2039032 Experimentation and Telemetry Don't send the Adjust ping when recording conversion events
2039058 Machine Learning: General Enable World Cup tool call by default for Smart Window
2039075 Machine Learning: Frontend Change gemini-2.5-flash-lite to gemini-flash-lite in about:preferences
2039334 Profile Backup Disable backup on MacOS to fix prompting issue
2038678 Other …
2039017 Other …
1962625 Other …
2038439 Other …
2038803 Other …