«  Firefox 153 beta cycle 

Uplifts by Product
462 uplifts

  1. OOM | small (12.77%) Known top crash
  2. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (6.38%) 1472062
  3. shutdownhang | mozilla::scache::StartupCache::GetBuffer (6.38%)
  4. AsyncShutdownTimeout | AddonManager: Waiting to start provider shutdown. | AddonRepository Background Updater (4.26%) 1841444
  5. AsyncShutdownTimeout | profile-before-change | Sqlite.sys.mjs shutdown blocker (4.26%) 2009476
  6. XREMain::XRE_main (4.26%) 1928888
  7. js::gc::detail::ChunkPtrHasStoreBuffer (4.26%) 1980548
Uplifts and Backouts
Bug Component Summary
2021850 Site Reports aladhan.com - Calendar is not generated as the "Generate" button does nothing
2034549 Search [Google Lens] Move all strings for translation
2041687 General Let QR code generation on Windows, macOS, and Linux ride the trains
2044067 Privacy Add telemetry for the trackers protections dashboard
2044082 Sidebar Apply auto/dynamic compact mode based on threshold ratio of sidebar and toolbar to the rest of window height/width
2044337 Site Reports www.okini.net - Error message displayed when attemtping to load the page
2044488 Sharing <Enter> doesn't copy the QR code by default
2044511 Sharing ".png" not appended to saved generated QR codes
2046555 WebRTC Crash when joining Meet
2046874 Tabs Update the Tab Groups to use the Nova color
2046875 Site Reports Google world-cup minigame's game area is shifted upwards a bit and clipped
2046911 Widget: Gtk [Wayland] Second D&D fails - only one wl_data_device is supported by compositors
2047131 JavaScript Engine Perma mozilla/tests/wasm/webapi/esm-integration/source-phase-eval-error.tentative.html | expected ERROR when Gecko 153 merges to beta on 2026-06-15
2047473 Homepage Sports widget: order the pager chronologically and open on the live (or next upcoming) match
2047688 Privacy Update list of supported IP Protection regions
2047933 Homepage [Homepage Sports Widget] [phase3] Fix the flash in the sports widget when displaying a third place champions card and a finals card in the pager
  1. OOM | small (17.50%) Known top crash
  2. LdrpCallInitRoutine (8.75%)
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (7.50%) 1472062
  4. XREMain::XRE_main (5.00%) 1928888
  5. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (3.75%) 1969401
  6. shutdownhang | RtlpWaitOnAddressWithTimeout | RtlpWaitOnAddress | RtlWaitOnAddress | WaitOnAddress (3.75%) 1828066
  7. AsyncShutdownTimeout | AddonManager: Waiting to start provider shutdown. | AddonRepository Background Updater (2.50%) 1841444
Uplifts and Backouts
Bug Component Summary
2011413 Toolbar Private icon color in toolbar
2014771 Onboarding Remove the legacy Juno onboarding AND any remaining unused attributes from the onboarding redesign
2034406 Printing: Output [skpdf] PDFs generated from pdf.js (via MozPrintCallback) are missing selectable text
2037923 XPCOM Crash in [@ shutdownhang | mozilla::scache::StartupCache::GetBuffer]
2039575 JavaScript Engine: JIT Crash in [@ CanAttachDOMCall] on Raptor Lake CPUs
2043614 Sidebar History search not working when sorting by "Website and date" or "Last visited"
2044506 New Tab Page Intermittent TV browser/extensions/newtab/test/xpcshell/test_WeatherFeed.js | single tracking bug
2044898 Sharing Consider adjusting the QR code background to improve contrast in the light theme
2045149 Security: RLBox Hit MOZ_CRASH(RLBox crash: range has overflowed sandbox bounds) at /builds/worker/workspace/obj-build/dist/include/mozilla/rlbox/rlbox_helpers.hpp:28
2045876 Widget: Gtk [Wayland][Gnome] Menu dropdowns open in the wrong place or are entirely missing, on HiDPI configurations (e.g. 200% display scaling)
2046262 Networking WebTransport only allows 2 concurrent remote initiated streams
2046497 Sidebar Update open tabs sidebar panel shortcut and make it available in the
2046945 New Tab Page Widgets doesn't match UI locale after switching language from settings
2047187 DOM: Core & HTML Select option element shows duplicate content as it changes text content
2047254 Privacy [IPProtection] Enabled the feature by default on nightly and beta
2047467 Audio/Video: Playback Update vendored mp4parse-rust to b693c7e4a91d
2047553 MFBT Perma [tier2] /builds/worker/fetches/sysroot-x86_64-linux-gnu/usr/include/c++/10/bits/stl_algobase.h:105:32: error: 'int __builtin_memcmp_eq(const void*, const void*, long unsigned int)' specified bound 20 exceeds source size
2047758 JavaScript Engine Error thrown from deduplication-truncated during memory reporting
2047849 Onboarding Onboarding clean up and refactor
2047850 Widget: Cocoa Printing via system print dialog no longer works on Mac
2047879 web-platform-tests Bad webrtc test expectation update from wpt-sync in bug 2045973 then bug 2046319
2047930 Onboarding [Onboarding] Update Treatment C variant to the marketing data onboarding card
2047940 Homepage Show longfox related text on the trackers blocked card when it's a longfox cta
2047983 Settings UI Update fluent strings for Settings pane headers that use message references
2048274 Widget: Gtk Tabs duplicate instead of moving when dragging and dropping on latest nightly linux builds
2048297 Homepage Sports widget: from the quarter-finals, show the full remaining bracket in the no-team pager
2043241 Other …
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2020308 Other …
  1. OOM | small (25.68%) Known top crash
  2. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (8.11%) 1472062
  3. js::gc::HeaderWord::get (4.05%) 1993404
  4. mozilla::ContentCache::AssertIfInvalid (4.05%) 2049044
  5. AsyncShutdownTimeout | profile-before-change | AddonManager: shutting down. (2.70%)
  6. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (2.70%) 2022780
  7. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (2.70%) 1969401
Uplifts and Backouts
Bug Component Summary
2030299 Search If there are duplicate keywords for search engines, the typed keyword and autocompleted keyword selects different engines
2043469 Address Bar non-matching history shows while editing location in address bar
2044078 Machine Learning: Frontend Smartbar model picker for BYOM does not work as expected
2044641 Machine Learning: Frontend Changing the AI model inside a tab will change the Ai model for every other open tab
2044674 Sharing The url from the QR code pop-up is displayed incorrectly on RTL builds
2045159 Layout: Scrolling and Overflow Assertion failure: mFrame->ComputeScrolledRect(mReferenceFrame) .IsEqualEdges(mScrolledRect) (The scrolled rect changed during an operation that assumed it would remain constant), at checkouts/gecko/layout/generic/ScrollContainerFrame.cpp:7079
2045172 DOM: Selection Hit MOZ_CRASH(Invalid ContentCache data) at checkouts/gecko/widget/ContentCache.cpp:106
2045884 Machine Learning: Frontend Don’t show smartbar placeholder animation in sidebar
2046390 WebDriver BiDi WebDriver BiDi script.addPreloadScript generated functions not working after a few navigations
2046492 IP Protection VPN toolbar button icons spill into each other in Customize Mode
2046785 Networking Temporarily turn off TLS token persistence
2046945 New Tab Page Widgets doesn't match UI locale after switching language from settings
2047268 JavaScript Engine Update irregexp to new version 199031eb59cdee6a25799d4d4ea40092c3522a71 from 2026-06-12 00:00:00
2047275 MFBT nightly fails to compile with: ../include/mozilla/Result.h:524:8: error: 'mozilla::Result<V, E>::mImpl' has incomplete type
2047320 Audio/Video: Playback Perma [tier 2] /mediasession/media-session-artwork-fetch.https.html | Set same origin media metadata - assert_equals: expected "strict-origin-when-cross-origin" but got "" | single tracking bug
2047328 Graphics: Canvas2D Perma canvas /html/canvas/element/manual/imagebitmap/createImageBitmap-serializable.html | Unhandled rejection | single tracking bug
2047412 General nightly fails to compile with: include/mozilla/Variant.h:786:32: error: use of built-in trait '__type_pack_element<N, mozilla::MarkerSchema::DynamicData, mozilla::MarkerSchema::StaticData>' in function signature; use library traits instead
2047507 Contextual AI 15.83 - 5.37% cnn-ampstories FirstVisualChange + 5 more (Android) regression on Mon June 1 2026
2047620 Address Bar Update handling of sorting of Semantic Search results so they rarely evict exact-match results from address bar results
2047708 DOM: Security Firefox fails to render HTMLVideoElement captions when Content-Security-Policy header is set to require-trusted-types-for 'script'
2048200 Homepage Expose longfox secret setting to all release types
2048202 Homepage Crash in [@ java.lang.IllegalStateException: at androidx.fragment.app.Fragment.requireContext(Fragment.java)] on Homepage
2048267 General Enable wpt tests beyond Nightly
2048329 Experimentation and Telemetry Microsurvey bottom sheet requires scrolling to reach the Submit button
2048663 Internationalization: Localization test_l10nregistry_observer.js has a perma failure on shippable Android multi-locale builds
2048993 Contextual AI Shake to summarize feature available but not listed in AI controls
2049060 Contextual AI Update shake-to-summarize nimbus features to use the same defaults everwhere
2046992 CSS Parsing and Computation Tweak custom property storage.
2045623 Other …
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  1. OOM | small (11.49%) Known top crash
  2. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (5.75%) 1472062
  3. js::gc::detail::ChunkPtrHasStoreBuffer (5.75%) 1980548
  4. GetComputedIntrinsic (4.60%)
  5. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (4.60%) 1969401
  6. _cairo_mutex_initialize (4.60%) 2044985
  7. mozilla::ContentCache::AssertIfInvalid (3.45%) 2049044
Uplifts and Backouts
Bug Component Summary
2044898 Sharing Consider adjusting the QR code background to improve contrast in the light theme
1189155 Tabbed Browser Convert private tabbrowser properties to use # or the underscore prefix instead of "m"
1980483 UI Widgets Provide a way to exclude the <article> nested in <moz-card> from the a11y tree
2026593 General Split browser/components/extensions/test/browser/browser.toml in smaller parts
2032561 Privacy Collect telemetry using the metrics added for VPN
2039987 Graphics Perma [tier 2] macosx1500-aarch64-vms/debug Assertion failure: state.mApzcTreeManagerParent == aTreeManager, at checkouts/gecko/gfx/layers/ipc/CompositorBridgeParent.cpp:X
2040618 Tooling With the new swipe controls, sometimes tapping doesn't work
2043503 Disability Access APIs 151 doesn't work well with NVDA screen reader for the blind in protonmail
2045278 Layout: Floats Put farthest-corner and closest-corner parameters for ellipse() behind a nightly-only pref?
2046017 Web Apps [Flatpak] "Add tab to Taskbar" unexpectedly shows "Create App" dialog and does not register the Web App in system search
2046466 Task Configuration Update gecko taskgraph to support esr153
2046553 Installer ERR_INSTALL_TIMEOUT isn't mapped to 'install_timeout' telemetry metric in telemetry.nsh
2047256 General nightly fails to config with: USE_LIBS contains "freeblpriv3", which does not match any LIBRARY_NAME in the tree.
2047491 Search CTRL+up/down arrow does not re-order the search engines correctly anymore
2047590 Security: PSM nsIPKCS11Token no longer allows to programatically log in
2047690 Geolocation Provider Catch network geolocation telemetry on exception
2047864 Design System and Theming [dark mode] The checkboxes have white checkmark, not black on a specific device
2048016 Search [Google Lens] Update API endpoint and parameters per new Google spec
2048173 Bookmarks Enable bookmarks import feature for release
2048557 Spelling checker crash in rlbox-generated spellchecker code with 153 on OpenBSD
2048655 Settings Toolbar customization settings in private mode have very low contrast after the Nova color updates
2048875 Task Configuration `staging_release_builds` target tasks method doesn't schedule anything
2048897 Task Configuration win64-aarch64 update-verify-config fails on esr due to missing 115.37.0esr
2048959 CSS Parsing and Computation Perma TEST-UNEXPECTED-FAIL | layout/style/test/test_value_cloning.html | serialization should be nonempty for -webkit-clip-path: ellipse(closest-corner farthest-corner) - didn't expect "", but got it when Gecko 154 merges to Beta on 2026-07-20
2049307 DOM: UI Events & Focus Handling Incorrect tab focus after clicking internal link
2045454 Other …
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  1. OOM | small (9.48%) Known top crash
  2. AsyncShutdownTimeout | quit-application | RemoteSettingsExperimentLoader: disabling (5.17%) 2018640
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (5.17%) 1969401
  4. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (4.31%) 2022780
  5. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (4.31%) 1472062
  6. mozilla::ContentCache::AssertIfInvalid (4.31%) 2049044
  7. mozilla::dom::CheckIsBadPolicy (4.31%)
Uplifts and Backouts
Bug Component Summary
1982177 General Window creation fails to position correctly on high-resolution monitors with 200% system scaling.
1996558 SQLite and Embedded Database Bindings Automatically encrypt SQLite databases on disk
2016438 Storage: IndexedDB 55.08 - 50.08% idb-open-few-seq delete_duration / idb-open-few-par delete_duration (Windows) regression on Fri February 6 2026
2032645 Shell Integration Unify Windows first run launch-on-login in browser-before-ui-startup, off by default, enabled via Nimbus
2033002 Machine Learning: Frontend Build feedback modal shell and wire to thumbs actions
2034541 Machine Learning: Frontend Send user feedback payload via Glean
2036411 General Intermittent [tier 2] package> /builds/worker/workspace/obj-build/gradle/build/mobile/android/android-components/components/concept/base/generated/source/buildConfig/androidTest/debug/mozilla/components/concept/base/test/BuildConfig | single tracking bug
2042605 JavaScript Engine I-loop in querySelector on sfgate.com
2043993 JavaScript Engine discord not working after refresh
2044517 Request Handling ChannelWrapper.registerTraceableChannel should drop mChannelEntry if listener registration failed
2045749 Homepage [a11y] Accessibility Scanner flags underlying background elements on the LongFox game screen
2045917 Inspector Intermittent devtools/client/inspector/fonts/test/browser_fontinspector_editor-variable.js | single tracking bug
2046009 Disability Access APIs VoiceOver forward command gets stuck on Spotify.com / manybooks.net
2047352 Netmonitor Stacktrace is not available for in-memory cached scripts
2048008 Toolchains Remove clang 20 toolchains
2048062 Task Configuration Perma docker-image-ubuntu2404-packages [taskcluster:error] exit status 1
2048964 Add-ons Manager amContentHandler should make sure that system triggeringPrincipal came from parent
2049044 DOM: Selection Hit MOZ_CRASH(Invalid ContentCache data) at checkouts/gecko/widget/ContentCache.cpp:106
2049429 Remote Settings Client Remote Settings clients polling for changes with stale expected values
2049515 Experimentation and Telemetry Add UTM source detection for Reddit attribution
2049754 Search Perma esr153 toolkit/components/search/tests/xpcshell/searchconfigs/test_searchconfig_google_additional.js | single tracking bug
2049785 Search [Google Lens] Replace google Lens toolbar icon
2049845 New Tab Page Firefox 152.0.2 extreme memory usage and complete freeze on startup (regression from 152.0.1)
2049948 Privacy "Built-in VPN" menu item is shifted too far right when the device is rotated horizontally
2050195 Machine Learning: Frontend Fix glean.error.invalid_value for microsurvey.smart_window.chat metric
2050562 Task Configuration macOS 10.15 tests being scheduled on every push to Beta
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  1. OOM | small (10.81%) Known top crash
  2. (anonymous namespace)::_Find_seq::_Search_impl<T> (5.41%)
  3. ImageTlsCallbackCaller (5.41%)
  4. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (5.41%) 1472062
  5. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (5.41%) 1969401
  6. OOM | large | alloc::raw_vec::handle_error (3.60%) 1906769
  7. AsyncShutdownTimeout | profile-before-change | Sqlite.sys.mjs shutdown blocker (2.70%) 2009476
Uplifts and Backouts
Bug Component Summary
2046129 Menu Only show the "Change wallpaper" menu item when on the Homepage
2047859 Gecko Profiler Profiler stackwalking fails on Android with non-legacy packaging for libs with AAB
2048383 Settings UI "Manage payment methods" list empty when a saved card has no expiration date
2048538 Report Broken Site Report Broken Site Send More Info includes screenshot after explicit screenshot opt-out
2048844 Tooling & Investigations Report Broken Site sends tab-specific data for the wrong tab after edited URL triggers wrong-tab-info state
2049602 Downloads Crash [@ android.os.FileUriExposedException: at android.os.StrictMode.onFileUriExposed(StrictMode.java) ]
2050095 Search Stock ticker $ search not working on Android
2050103 Search Flight suggestion card shows arrival/departure time in device timezone instead of airport's local timezone
2050146 Search Expose Search Optimization Feature secret settings on Beta
2050458 Layout: Block and Inline Regression in layout with SVG icons in Firefox 153
2050463 Privacy Correctly dispatch "onboarding_not_now_tapped" when user taps on Not now in onboarding sheet
1979688 Tabbed Browser Use # private fields for tabbrowser's internal state instead of underscore prefixes
2013800 DOM: Content Processes Missing Authorization in ContentParent::RecvAddCertException Allows Persistent TLS Certificate Override Injection
2032719 Settings UI Scrolling the Applications table using the mouse wheel with a dropdown menu open from the Applications > Action will also move the dropdown menu
2044651 Menus Generate QR code… option is available when multiple tabs are selected if accessed from File > Share or url bar context menu
2046215 DOM: HTML Parser Images nested in table should not be associated with form element inside the table if the form had been removed by script before the images were inserted by the parser]
2050342 Toolchains Bump the minimum supported version of clang to 19
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  1. OOM | small (19.12%) Known top crash
  2. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (5.88%) 1472062
  3. mozilla::dom::TypedArray_base<T>::ProcessFixedData<T> (5.88%) 1856672
  4. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (4.41%) 2022780
  5. AsyncShutdownTimeout | AddonManager: Waiting to start provider shutdown. | AddonRepository Background Updater (3.68%) 1841444
  6. AsyncShutdownTimeout | profile-before-change | AddonManager: shutting down. (2.94%)
  7. EnterJit (2.94%) 1848584
Uplifts and Backouts
Bug Component Summary
2021136 JavaScript: WebAssembly toResizableBuffer is not working with WasmWorkers in Firefox 148.0 (64-bit)
2035772 Contextual AI [Shake to Summarize] Page summaries is cropped in landscape on Samsung Galaxy S9
2037689 Graphics: Color Management [HDR/Windows] Some GPU vendors need us to handle BT2100 HLG with a shader
2039990 IPC Validate principals more on PBackground actors
2041097 Web Apps Taskbar Tabs page action appears on file: URIs
2043462 DOM: Navigation Crash in [@ mozilla::dom::ContentParent::StorePendingLoadState]
2045990 Themes The latest nightly does not respect custom themes
2046623 Messaging System Create an "on message show" or "on screen impression" action
2048587 General "Set as Default browser" doesn't show when Nimbus experiment wants it to
2048642 Privacy Record telemetry for catastrophic failures
2048694 Privacy [IPProteciton] Record telemetry for when a generic network event occurs
2049313 Privacy Incorrect VPN Onboarding sheet displayed on screen
2050051 Search "Search Image with Google Lens" menu item disappears after closing a private window
2050083 Privacy [Intermittent] Users can get stuck in "Connecting" state in "VPN" Settings page after a sign-out
2050518 Protections UI Add method to query daily tracker stats to PrivacyMetricsService
2050731 Toolchains Update the documented minimum clang version to 19
2050775 Shell Integration 63.63 - 4.16% tp5n main_startup_fileio + 8 more (Windows) regression on Thu June 18 2026
2050888 Search [Google Lens] Enable Google Lens in nightly by default and enable secret setting for beta
2051165 Toolchains Frequent launchpad timeouts during toolchain rebuilds
2051274 DOM: HTML Parser Crash in [@ mozilla::IdleTaskRunner::CancelTimer]
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  1. OOM | small (14.35%) Known top crash
  2. _cairo_mutex_initialize (7.62%) 2044985
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (5.38%) 1969401
  4. js::gc::HeaderWord::get (4.48%) 1993404
  5. OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser (3.14%) 2022780
  6. OOM | large | alloc::raw_vec::handle_error (2.69%) 1906769
  7. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (2.69%) 1472062
Uplifts and Backouts
Bug Component Summary
2024035 UI Widgets Handle elements in reorderable moz-box-groups are missing HCM styles
2033102 Enterprise Policies Support allowed_permissions in ExtensionSettings enterprise policy
2033463 Enterprise Policies Allow force/normal_installed extensions to be installed from AMO when install_url is absent in ExtensionSettings
2039860 Bookmarks [A11Y][Importing bookmarks] Talkback announces "toggle" instead of "open" or "activate" for folder access and opening a bookmarked page
2044499 Audio/Video Add HW support plumbing to RemoteDecoderModule::Supports result
2045752 Themes Browser theme light/dark token colors are applied to in-content pages
2047112 Machine Learning: Frontend The AI Assistant Manage tabs tool will not close unloaded tabs or tabs that are not fully loaded
2048027 Security Improve telemetry: load_aboutneterror (dnsNotFound online/offline directional probe)
2048048 Settings UI Policies interactions with the new settings UI for Firefox Home
2048696 Enterprise Policies ExtensionSettings policy ignores REG_SZ when there is a key (Windows registry)
2048858 Privacy Crash in [@ java.lang.ClassCastException: at org.mozilla.gecko.util.GeckoBundle.getString(GeckoBundle.java)]
2049750 Toolbar "Swipe toolbar vertically to see open tabs" interferes with tab bar scrolling
2049995 Installer Permanent beta as esr153 browser/installer/windows/nsis/test/xpcshell/test_stub_installer.js | single tracking bug - please fix before 2026-07-03
2050032 Homepage [Longfox] LongFox animation is visibly retracting upon restoring the app from background
2050110 Audio/Video: Playback Firefox session gets partially unusable after following specific steps on X page
2050409 Privacy TalkBack does not announce the turn on/off action
2050416 Privacy TalkBack does not announce the page title when navigating to VPN Settings from the browser menu
2050775 Shell Integration 63.63 - 4.16% tp5n main_startup_fileio + 8 more (Windows) regression on Thu June 18 2026
2050882 General 62.68 - 5.24% tp5n main_startup_fileio + 3 more (Windows) regression on Fri June 12 2026
2051090 Crash Reporting crashed-tab UI doesn't show any check on the "submit crash report to Mozilla" checkbox, even when it's checked
2051285 Storage: Quota Manager Useless reinterpret_cast in EncryptingOutputStream_impl.h
2051489 Homepage Home wallpaper is pushed up by the IME
2051543 Homepage Up button in top left has too small a touch target size
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  1. OOM | small (19.57%) Known top crash
  2. _cairo_mutex_initialize (7.76%) 2044985
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (5.90%) 1472062
  4. js::gc::HeaderWord::get (3.42%) 1993404
  5. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (3.11%) 1969401
  6. XREMain::XRE_main (3.11%) 1928888
  7. shutdownhang | RtlpWaitOnAddressWithTimeout | RtlpWaitOnAddress | RtlWaitOnAddress | WaitOnAddress (3.11%) 1828066
Uplifts and Backouts
Bug Component Summary
2051041 Downloads Downloads being deleted when "Remove from download history" option selected
2051431 Homepage [Homepage Sports Widget] Disable WorldCup Widget after a particular date
2052161 Mozbase Rust Crate depends on a vulnerable version of quick-xml.
2052394 DOM: Editor Assertion failure: IsForDesignMode(), at checkouts/gecko/dom/events/IMEContentObserver.cpp:252
2009145 Browser Engine [LNA] Add notifyShown callback to track LNA prompt display state in Fenix
2050477 Other …
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2008369 Other …
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  1. OOM | small (15.06%) Known top crash
  2. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (6.39%) 1969401
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (5.18%) 1472062
  4. js::gc::HeaderWord::get (2.89%) 1993404
  5. shutdownhang | RtlWaitOnAddress | WaitOnAddress (2.89%) 1505660
  6. js::gc::detail::ChunkPtrHasStoreBuffer (2.77%) 1980548
  7. shutdownhang | RtlpWaitOnAddressWithTimeout | RtlpWaitOnAddress | RtlWaitOnAddress | WaitOnAddress (2.41%) 1828066
Uplifts and Backouts
Bug Component Summary
2030652 Privacy: Anti-Tracking Screen reader does not capture the reduce protection infobar only the buttons
2035442 Security New dnsNotFound error page does not give advices on checking the URL
2046575 Search Local search shortcuts disabled in the old preferences will not appear in Search Mode Switcher
2047962 AutoConfig (Mission Control Desktop) `browser.startup.homepage` with `data:text/plain,browser.startup.homepage=…")` incompatible since 152.0
2048072 Marionette Client and Harness Intermittent macosx1500-aarch64-vms testing/marionette/harness/marionette_harness/tests/unit/test_chrome_switch_window.py | test_switch_tabs_for_new_background_window_without_focus_change | AssertionError: 0 != 1
2048338 Machine Learning: Frontend Add a single row of Shortcuts on Smart Window New Tab
2048511 Address Bar Better manage generating Places embeddings on slower computers
2049331 Settings UI Tracking Protection is not deactivated for private window.
2050140 Messaging System Add new action-only message type in messaging system
2050143 Messaging System Add a new REMOVE_LAUNCH_ON_LOGIN message action
2050145 Messaging System Add `isLaunchOnLogin` targeting attribute
2050967 Privacy [IPProtection] getAccessToken is getting called excessively
2050986 Privacy FxA goes into a bad state if user with a previously authorized Relay account tries to authorize VPN
2052798 DOM: Service Workers Make asserts in VerifyClientPrincipalInfosMatch more granular
2051653 Other …
2046416 Other …
2043300 Other …
2046916 Other …
2046917 Other …
2049418 Other …
2045511 Other …
2042739 Other …
2052703 Other …
2028004 Other …
2047802 Other …
2047522 Other …
2050368 Other …
2045198 Other …
  1. OOM | small (17.99%) Known top crash
  2. js::gc::HeaderWord::get (7.12%) 1993404
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (6.80%) 1969401
  4. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (6.67%) 1472062
  5. shutdownhang | RtlpWaitOnAddressWithTimeout | RtlpWaitOnAddress | RtlWaitOnAddress | WaitOnAddress (2.69%) 1828066
  6. js::gc::detail::ChunkPtrHasStoreBuffer (2.33%) 1980548
  7. shutdownhang | RtlWaitOnAddress | WaitOnAddress (2.01%) 1505660
Uplifts and Backouts
Bug Component Summary
2044464 General Notify the user about Local Mode when loading files via file:// URL
2044978 Graphics: WebRender 10.62 - 8.48% tsvgx + 1 more (Linux, OSX) regression on Thu May 28 2026
2046299 Widget: Gtk firefox nightly fails to compile in ../browser/components/shell/nsGNOMEShellService.cpp:32:10: fatal error: mozilla/widget/AsyncDBus.h: No such file or directory
2046554 Enterprise Policies Search engines can no longer be "Remove"-d via policy
2047558 Machine Learning: Frontend The History grid view is truncated when overlapping the Smart bar
2047650 JavaScript: GC Intermittent Assertion failure: pm->hasActiveTasks(lock), at checkouts/gecko/js/src/gc/ParallelMarking.cpp:X
2048114 Settings Settings fragment uses bold text on old android versions
2048944 Internationalization Cannot detect ISO-2022-JP
2050000 Settings UI Social media trackers are not blocked in the normal window if Tracking content is set to all windows with the new settings redesign
2050250 Privacy [A11Y] Consider making a tracker blocking dashboard item larger, also it may not have a label readable by screen readers
2050420 UI Widgets Error: can't access property "focus", defaultButton is undefined - for dialogs without default
2050749 Settings UI Redesigned ETP Custom UI does not force a tracker list update when toggling cryptominer/fingerprinter blocking
2050750 Settings UI Redesigned ETP Custom UI no longer records privacy.ui.fpp.click telemetry for the suspect-fingerprinting controls
2050943 Machine Learning: Frontend The Restore Session is unavailable if Smart Window is set as the default Window
2051021 Layout: Text and Fonts Fontconfig 2.18 regression breaks font matching for fonts with special characters (-:,)
2052037 Audio/Video: Playback Hardware video decoding fails in Firefox 152 (Linux / VAAPI)
2052040 Settings UI Handle legacy object format for browser.backup.enabled_on.profiles in settings
2052599 Privacy [IPProtection] Onboarding card flow is broken for already authenticated users
2052637 Layout: Form Controls Pressing Page Up or Page Down keys does nothing when the textarea is not overflowing and the page is scrollable
2053032 General The "Settings" menu cannot be entirely scrolled in landscape mode - the "Mozilla" section is not displayed at all
2053060 Containers Enable containers by default in release
2053263 Graphics: Color Management [HDR/Windows] Memory leak when playing HDR video
2052375 Other …
2043188 Other …
2045407 Other …
2045773 Other …
2049714 Other …
2022635 Other …
2035756 Other …
  1. OOM | small (16.39%) Known top crash
  2. js::gc::HeaderWord::get (8.13%) 1993404
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (6.79%) 1472062
  4. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (3.91%) 1969401
  5. shutdownhang | RtlpWaitOnAddressWithTimeout | RtlpWaitOnAddress | RtlWaitOnAddress | WaitOnAddress (3.24%) 1828066
  6. shutdownhang | RtlWaitOnAddress | WaitOnAddress (2.51%) 1505660
  7. AsyncShutdownTimeout | profile-before-change | Sqlite.sys.mjs shutdown blocker (1.77%) 2009476
Uplifts and Backouts
Bug Component Summary
2019492 Settings UI After bug 1972076, Applications list in Settings has suboptimal keyboard and screen reader accessibility
2033733 DOM: Networking [LNA] Enable LNA for all desktop users by default.
2034907 Panning and Zooming Intermittent Assertion failure: IsRootContent() || relativeOffset == CSSPoint(), at checkouts/gecko/gfx/layers/FrameMetrics.cpp:X
2034921 Machine Learning: Frontend Re-enable smart cursor and integrate with Smart Window
2044112 Machine Learning: Frontend adjust smart cursor behaviors for smart window: usage telemetry, setting to disable, default enable
2047651 Networking Nightly fails to link with "error: undefined symbol: FREEBL_GetVector"
2048851 IPC Crash in [@ mozilla::ipc::FatalError | mozilla::ipc::IProtocol::HandleFatalError | mozilla::ipc::IProtocol::FatalError | nsDocShellLoadState::nsDocShellLoadState]
2049049 DOM: Core & HTML crash at null in [@ AutoJSAPI]
2049720 Widget: Gtk [GTK] text/plain is missing from dataTransfer.types when dropping content from an external application
2050002 Widget: Cocoa Download files (extensions are removed) 153.0b3 (64-bit) mac version
2050140 Messaging System Add new action-only message type in messaging system
2051247 Style Editor Content of stylesheet is not correct when the file has a network override
2052081 Address Bar Support ampTopPickUseNovaIconSize in Nova
2052169 Performance Process creation is super slow on my Android phone
2052176 Style Editor Automatically detect local stylesheet file when using Local Mode
2052841 Networking Don't taint a same-origin response that a service worker substitutes for a cross-origin request
2053049 Address Bar URL bar stops reacting to Enter, click on → does nothing after a while
2053177 Widget: Cocoa nsIFilePicker invokes callback before another modal can be safely launched
2053375 DOM: Core & HTML Tons of leaks in beta due to native color picker.
2053442 Messaging System Add PIN_FIREFOX_TO_TASKBAR to the action_only message allowlist
2047714 WebRTC: Audio/Video Perma beta TEST-UNEXPECTED-PASS | /_mozilla/media-capabilities/decodingInfo-webrtc-power-efficient.any.worker.html | decodingInfo: video/VP8 7680x4320 is not powerEfficient - expected FAIL
2047747 Search [Google Lens] Move Google Lens control setting to "search settings" from "ai settings"
2052570 DOM: Core & HTML Assertion failure: false (MOZ_ASSERT_UNREACHABLE: Child is not actually a child of parent), at checkouts/gecko/dom/base/nsINode.cpp:419
2053515 Messaging System Add Windows Update Build Revision to os in the the Client Environment
2050430 Other …
2045407 Other …
2052562 Other …
2052060 Other …
2050662 Other …
2052207 Other …
2053576 Other …
2049308 Other …
2046858 Other …
2045848 Other …
2050626 Other …
  1. OOM | small (16.57%) Known top crash
  2. js::gc::HeaderWord::get (9.96%) 1993404
  3. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC (5.52%) 1472062
  4. OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate (5.42%) 1969401
  5. shutdownhang | RtlWaitOnAddress | WaitOnAddress (2.76%) 1505660
  6. shutdownhang | RtlpWaitOnAddressWithTimeout | RtlpWaitOnAddress | RtlWaitOnAddress | WaitOnAddress (2.47%) 1828066
  7. JS::Value::isGCThing (2.07%) 1876939
Uplifts and Backouts
Bug Component Summary
1800120 DOM: Content Processes Remove CreateWindowInDifferentProcess
1966584 Enterprise Policies First click on external protocol not working
1988166 General: Unsupported Platforms fatal error: sys/single_threaded.h: No such file or directory
2030362 Disability Access APIs Parent table adopts child table's cells
2036124 Session Restore Open about:newtab or default start page by default on restore
2036790 Toolbar The "Fill link from clipboard" is displayed in private mode with Light theme
2042825 Settings UI Clicking inside the "Reload all tabs" warning reloads all the tabs without clicking the actual button
2046240 Machine Learning: Frontend Update SmartWindow Nimbus feature with enable variable
2046952 Machine Learning: Frontend Add URL bar to Smart Window new tab
2047329 Audio/Video: Playback DOM Media - Share VkDevice across Vulkan video decoders to fix multi-stream stalls and delays
2047586 Release Automation merge automation raced against itself and created a bad tag
2048231 MFBT thunderbird 152 crashes at startup on OpenBSD, in the profiler initialization code due to fallback TLS implementation returning random garbage
2049494 Shell Integration Windows launch-on-login can silently re-enable itself on later startups for existing users (first-run enable gate is not durable)
2050081 Telemetry Record corrected active tick limited to non-synthesized events
2050093 Telemetry Record custom distribution of consecutive active ticks
2050099 Telemetry Record timing distribution for duration of inactive periods
2050828 Messaging System Clicking the “Manage settings” option from the dropdown menu doesn't open the Settings page for at least 2 callout messages
2050846 Themes Double border on keyboard navigation for Search Engine Switcher engines in Alpenglow theme
2051664 Graphics Android bundled fonts are mistakenly not loaded when stored rather than deflated in omni.ja
2052627 Machine Learning: Frontend Store time since user last switched mode from SW to CW
2052753 Audio/Video: cubeb Update libcubeb and cubeb-pulse-rs to latest upstream revisions
2052789 Tabbed Browser Only one line of multi-line text is searched when dragging it onto the tab bar
2052819 Graphics: WebRender Ancestor clips (overflow:hidden and clip-path) not applied to transformed raster image larger than its container inside a preserve-3d context (regression, 151→152)
2053231 Task Configuration Update mozilla-taskgraph to v4.4.0
2053927 Address Bar [Nova] Update the icon in the switch-to-tab chiclet (view-opentabs.svg) and make it vertically centered
2053938 Nimbus Desktop Client When a pref flip is unenrolled, and the default value changed in the meantime, the old pref value is restored
2054206 Machine Learning: Frontend Fix Smart Window Promo ghost button background
2054321 General ld.lld: error: undefined symbol: __atomic_store
2054471 PDF Viewer Disable the text selection based on backdrop filter in beta
2040386 Other …
2052134 Other …
2050534 Other …
2053273 Other …
2051854 Other …
2044063 Other …
2053680 Other …
2039452 Other …
2053326 Other …
2045468 Other …
2049804 Other …
2052565 Other …
2046407 Other …
2048936 Other …
2053583 Other …
2051015 Other …
2047689 Other …
2053637 Other …
2053635 Other …
2054614 Other …

Last beta shipped

Uplifts and Backouts
Bug Component Summary

Beta to release merge

Uplifts and Backouts
Bug Component Summary
2048409 Widget: Cocoa Remove blanket allow sysctl-read from RDD process
2047689 Other …
2054614 Other …