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Bug landings and crashes
In Nightly
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Current Desktop beta cycle:
149
Uplifts by Product
272 uplifts
Firefox
107
Other
70
Core
47
Firefox for Android
24
WebExtensions
6
Toolkit
5
Firefox Build System
3
Testing
3
External Software Affecting Firefox
2
Remote Protocol
2
Release Engineering
2
Web Compatibility
1
149.0b1
6 bugs uplifted
(contains all the patches landed during the nightly cycle)
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(15.25%)
Known top crash
mozilla::layers::NativeLayerMacSurfaceHandler::HandlePartialUpdate<T>
(11.86%)
Top crash
2018247
IPCError-content | RecvConstructBrowser BrowserChild::Init failed (rv=NS_ERROR_FAILURE)
(5.08%)
2014692
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(3.39%)
1472062
XREMain::XRE_main
(3.39%)
1928888
AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot'
(2.54%)
1877111
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::AllocateTenuredCellInGC
(2.54%)
1921815
Uplifts and Backouts
Bug
Component
Summary
2005854
Theme
Paint the toolbox background-color to the body element.
2016280
DOM: Core & HTML
Consider implementing text controls with Shadow DOM rather than NAC.
2018056
Alerts Service
Clicking toast notifications brings up default window if alerts.useSystemBackend.windows.notificationserver.enabled = false
2018235
Marionette
Perma wd TEST-UNEXPECTED-PASS | /webdriver/tests/classic/perform_actions/pointer_mouse.py | test_down_closes_browsing_context[with up] - expected FAIL | single tracking bug
2018248
Tabbed Browser
Land Fluent ID strings for the title and description of the Tab Notes in features.ftl - mozsearch
2018740
Task Configuration
Ensure `update-test` tasks don't use internal pypi
149.0b2
18 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(12.37%)
Known top crash
IPCError-content | RecvConstructBrowser BrowserChild::Init failed (rv=NS_ERROR_FAILURE)
(8.25%)
2014692
js::frontend::ScriptStencil::gcthings
(7.22%)
AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot'
(5.15%)
1877111
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(4.12%)
1472062
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate
(4.12%)
1969401
shutdownhang | mozilla::SpinEventLoopUntil | nsThread::WaitForAllAsynchronousShutdowns | nsThreadManager::ShutdownNonMainThreads
(4.12%)
1524247
Uplifts and Backouts
Bug
Component
Summary
1992744
Tabbed Browser: Split View
Add telemetry for split view
1996471
Tabbed Browser: Split View
Frequent browser/components/tabbrowser/test/browser/tabs/browser_tab_splitview_contextmenu.js | single tracking bug
2010728
Menus
"New AI Window" and "New Classic Window" items shown in macOS File menu when no Firefox windows are open
2014272
Messaging System
[AIWindow] Add pref flip to show AI switcher icon on about:welcome AI Window screen
2015790
Privacy
The "Unlock your device" prompt cannot be dismissed when using PIN as the only Unlock method
2015874
Tabbed Browser
Nimbus targeting attribute for number of tab notes
2016943
Raptor
Perma Btime connect Exception: Couldn't execute privileged script named CUSTOM PRIVILEGED error:JavascriptError: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsISpeculativeConnect.speculativeConnect]" nsresult
2017049
Search
Newtab search handoff can't be disabled anymore
2017482
DOM: Editor
crash near null [@ nsINode::GetShadowRootForSelection]
2017500
DOM: Core & HTML
crash near null [@ mozilla::ContainedTextAutoDirectionality]
2017735
Search
Impression attributes should check element visibility before reporting as true
2017742
IP Protection
Remove IPP usage metrics
2017901
Graphics
Crash in [@ libc.so | mozilla::widget::LayerViewSupport::DoRequestScreenPixels::{lambda#1}::operator()]
2018257
Search
Temporarily revert changes which cleaned up messages in the ContentSearchParent
2018644
New Tab Page
MREC visual bug
2019138
Messaging System
Use onboarding refresh strings
2019680
Tabbed Browser: Split View
Update tabSwitch messaging to only fire after every 3 tab switches between the same two tabs
2019794
Experimentation and Telemetry
Update Adjust post install event tokens
149.0b3
27 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(15.94%)
Known top crash
AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot'
(5.80%)
1877111
js::gc::detail::ChunkPtrHasStoreBuffer
(5.80%)
1980548
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate
(5.07%)
1969401
OOM | unknown | NS_ABORT_OOM | mozilla::dom::Promise::CreateInfallible | mozilla::dom::ReadableStreamDefaultReader::Read
(3.62%)
2015430
js::gc::HeaderWord::get
(3.62%)
1993404
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(2.90%)
1472062
Uplifts and Backouts
Bug
Component
Summary
1963712
Alerts Service
Allow GIF images in Windows Toast Notifications
2002991
Release Automation
Enable RPM shipping for firefox beta
2009468
Session Restore
Add canonical URL to tab state for use by tab notes
2009927
Release Automation
rpm: Sign in-tree firefox RPM packages
2012254
Tabs
Custom Tabs' 3-dot-menu is purple (private-browsing-themed), if Firefox Nightly has a private tab in the foreground
2013426
Messaging System
Allow Messaging System to show animated gifs in Windows notifications
2016506
Layout
Assertion failure: mFrames.IsEmpty() (unexpected second call to SetInitialChildList), at /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:75
2016617
Web Apps
Intermittent TV browser/components/taskbartabs/test/browser/browser_taskbarTabs_icons.js | single tracking bug
2017744
IP Protection
Add IPP bandwidth used metric
2018202
IP Protection
[Linux] “Use VPN for this site” label wraps to 2nd line and overlaps the divider
2019136
Messaging System
Add onboarding brand refresh images
2019177
Tabs
Custom Tabs' system tray & navbar are purple (private-browsing themed), if Firefox Nightly has a private tab in the foreground
2019360
Cycle Collector
Crash in [@ CCGraph::Init] with "OOM"
2019532
Graphics
Crash in [@ @0x0 | mozilla::gl::GLContext::fBlitFramebuffer | RenderCompositorOGLSWGL::MaybeCaptureScreenPixels] on Mali-400
2019602
Tabbed Browser: Split View
Footer telemetry trigger events are sent as icon telemetry events
2019776
Messaging System
Remove OS restrictions for Smart Window ToU modal for existing users
2018090
Other
…
2015291
Other
…
2016375
Other
…
2016511
Other
…
2019517
Other
…
2011412
Other
…
2017512
Other
…
2018400
Other
…
2017303
Other
…
2017942
Other
…
2018405
Other
…
149.0b4
31 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(22.41%)
Known top crash
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(4.60%)
1472062
(anonymous namespace)::wasapi_register_device_collection_changed
(4.02%)
webrender::render_task::RenderTask::new_dynamic
(4.02%)
mozilla::net::LoadInfo::SetReservedClientInfo
(3.45%)
OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser
(2.87%)
2022780
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate
(2.87%)
1969401
Uplifts and Backouts
Bug
Component
Summary
1985031
Experimentation and Telemetry
[Experiment] The Setup Checklist cannot be completed/dismissed if the user checks the “Don’t ask again” checkbox on the “Set as default" prompt and another browser is set as default
2001938
DOM: Core & HTML
docs.google.com - Ctrl+F5 in Google Slides to present in full screen is blocked
2014295
Tabbed Browser
Move Tab Note section in Tab Preview to new panel
2014299
Tabbed Browser
Improve persistence handling in Tab Preview
2014358
Tabbed Browser: Split View
Pinning a split view is allowed when part of a multiselection
2014692
DOM: Navigation
Crash in [@ IPCError-content | RecvConstructBrowser BrowserChild::Init failed (rv=NS_ERROR_FAILURE)]
2014810
IP Protection
Confirm correct decimal format for data left for VPN
2014925
Graphics
Crash in [@ <gleam::gl::GlesFns as gleam::gl::Gl>::get_shader_info_log]
2014963
Tabbed Browser: Split View
Dragging a Split View and a normal tab to an existing window will multiselect all the tabs on the left
2015915
IP Protection
Add timeouts to requests in GuardianClient
2017378
Security
Enable felt privacy error pages by default for Beta and Release 149
2017547
Site Reports
www.hyattinclusivecollection.com - The page continuously reloads itself
2017603
IP Protection
GuardianClient survives uninit()
2017756
IP Protection
Show error icon for network errors only after a VPN attempt
2017785
Storage: IndexedDB
Assertion failure: aNewLength <= base_string_type::mLength (Truncate cannot make string longer), at /builds/worker/workspace/obj-build/dist/include/nsTSubstring.h:1026
2017797
General
Clipboard2File stopped working in Firefox Nightly
2017903
DOM: Core & HTML
Crash in [@ mozilla::dom::WindowGlobalChild::RecvProcessCloseRequest]
2017949
Widget: Gtk
Toggling checkbox of titlebar in Customize Toolbar causes the entire browser window becomes transparent.
2018004
Networking: Cookies
Assertion failure: !partitionedPrincipalOriginAttributes.mPartitionKey.IsEmpty(), at /builds/worker/checkouts/gecko/netwerk/cookie/CookieService.cpp:621
2018009
IP Protection
Update IPP uses of BANDWIDTH.MAX_IN_GB to be based on usageInfo
2018852
IP Protection
The usage warning is still displayed after signed out
2019296
Settings UI
Default font option disappears from Fonts dropdown after reverting selection
2019414
Messaging System
Add a Nimbus variable for privacy milestones
2019453
mozperftest
Perma [tier 2] homeview Exception: Difference in Images is too high, suspected faulty run
2019555
Address Bar
Width of new searchbar is not remembered
2019713
IP Protection
Clear bandwidth warning infobar on sign out
2019715
IP Protection
Clear all bandwidth warnings when the user hits bandwidth limit
2019799
New Tab Page
Add ability to turn off ScriptLoader in AboutNewTabChild
2019813
Other
…
2018592
Other
…
2013762
Other
…
149.0b5
46 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(11.15%)
Known top crash
AsyncShutdownTimeout | profile-before-change-telemetry | CrashManager: submitting Glean crash ping(s)
(4.83%)
2017910
AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot'
(4.46%)
1877111
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(3.72%)
1472062
mozilla::ErrorLoadingSheet
(3.72%)
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate
(3.35%)
1969401
js::gc::detail::ChunkPtrHasStoreBuffer
(2.97%)
1980548
Uplifts and Backouts
Bug
Component
Summary
1853873
Settings UI
Intermittent browser/components/preferences/tests/browser_application_xml_handle_internally.js | applicationXmlHandleInternally - application/xml is present in handlersView - null == true | single tracking bug
1930026
Settings UI
Frequent browser/components/preferences/tests/browser_change_app_handler.js | at least one item is present | single tracking bug
1972076
Settings UI
Convert Applications to config-based prefs
2008317
Address Bar
[unified trust panel] http-only "Not Secure" shield loses its red slash (making it look more-trustworthy) when you turn off tracking protection
2009191
General
Crash in [@ java.lang.IllegalArgumentException: at androidx.compose.ui.text.internal.InlineClassHelperKt.throwIllegalArgumentException(InlineClassHelper.kt:3)]
2010864
Settings UI
Applications action menu dropdown option overflows and causes scroll
2011220
Search
Middle clicking alternate engines should perform a search on the current search bar text in a new tab
2013818
Tabbed Browser: Split View
Cannot restore a tab group when it contains a split view with an `about:newtab`
2014304
Audio/Video
tab preview for netflix oddly corrupted
2015252
Tabbed Browser: Split View
Add 'reverse tabs' menu option to the tab context menu for tabs in a Splitview
2016048
Performance
Make Windows hardware pools use `hideCmdWindow`
2016638
Settings UI
Frequent browser/components/preferences/tests/browser_applications_selection.js | checkDropdownBehavior - mailItem is present in handlersView. - null == true | single tracking bug
2016648
Settings UI
High frequency browser/components/preferences/tests/browser_bug410900.js | single tracking bug
2016733
Settings UI
Frequent browser/components/preferences/tests/browser_filetype_dialog.js | dialogShowsCorrectContent - pdfItem is present in handlersView. - null == true | single tracking bug
2016820
Settings UI
rows without possible action in new application settings design
2017031
Graphics: WebRender
Hit MOZ_CRASH(Bad Prim render task size: 0x0) at gfx/wr/webrender/src/render_task.rs:992
2017369
Address Bar
Unified Trust Panel has various contradictory and confusing bits of UI, on "Server Not Found" error-page
2017486
IP Protection
Split up ipprotection.toggled metric
2017487
IP Protection
Add metrics for IPP exclusions
2017741
IP Protection
Add metrics for when IPP proxy is paused
2017868
DOM: Navigation
Set sameDocumentNavigationOverridesLoadType pref to false by default on all channels (Android)
2018133
Profile Backup
Perma browser/components/backup/tests/xpcshell/test_BackupService_crossProfileTypeRecovery.js | test_legacy_backup_into_legacy_profile - [test_legacy_backup_into_legacy_profile : 247] maybeSetupDataStore - when Gecko 149 merges to beta on 2026-02-23
2018651
IP Protection
[Linux] The “VPN is off for this site” confirmation hint is displayed when “Use VPN for this site” toggle is switched off
2018942
DOM: UI Events & Focus Handling
Disable APZ touch slop when running test_coalesce_touchmove.html test
2019011
Tabbed Browser: Split View
Update "Open Link in Split View" context menu option to open a split view with a tab for the link and a tab for the existing page you were on when opening the link
2019245
Privacy: Anti-Tracking
Collect availTop/left
2019298
Other
Crash in [@ stackoverflow | dynamicdll64.dll | <unknown in ntdll.pdb>]
2019311
Machine Learning: Frontend
The Smart Window Welcome Screen is displayed at startup on Ubuntu
2019386
IP Protection
Remove unused ipprotection.enabled metric
2019574
Address Bar
browser.search.widget.lastUsed is never updated in new searchbar
2019900
Session Restore
The tabs added to a closed group are all blank when the group is restored if the Add Split View to group option was used on that closed group
2019924
Address Bar
[macOS] Missing ‘Add’ badge for open search engines in the Unified Search Button
2020341
Address Bar
"Switch to Tab" suggestion is empty
2020354
Settings UI
Two links to redesigned privacy & security settings are partially broken
2020423
Homepage
Edge to edge issue in 148 on homepage after going through new onboarding
2020766
Toolbar
Disable open in app (firefox) option in menu when we have sandbox custom tab
2020847
Settings
[Settings Search] Enable settings search by default in release
2021000
IP Protection
IPPOnboardingMessageHelper.observe should check if subject is null before calling QueryInterface
2021035
Onboarding
Make the brand refresh onboarding the default onboarding experience in the onboarding manifest
2018196
Other
…
2016368
Other
…
2016374
Other
…
2019302
Other
…
2014857
Other
…
2019112
Other
…
2019811
Other
…
149.0b6
23 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(18.22%)
Known top crash
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::GetGCKindSlots
(6.57%)
1472062
js::gc::detail::ChunkPtrHasStoreBuffer
(4.66%)
1980548
AsyncShutdownTimeout | profile-before-change-telemetry | CrashManager: submitting Glean crash ping(s)
(2.97%)
2017910
OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser
(2.54%)
2022780
XREMain::XRE_main
(2.33%)
1928888
EnterJit
(2.12%)
1848584
Uplifts and Backouts
Bug
Component
Summary
2006018
Tabbed Browser: Split View
[linux] Tab bar height is increased when a Split View is created
2011962
Bookmarks
Edit bookmark(s) (or bookmark-folders): Spaces are ignored when typed at the end of the bookmark name (or folder name)
2015359
JavaScript: GC
Assertion failure: element, at ds/SinglyLinkedList.h:77
2018218
Settings UI
Add granular telemetry for AI Controls preference changes
2019515
Graphics
Video Quality regression when using Nvidia VSR compared to 147
2019925
Tabbed Browser: Split View
Using the `Move tab to Split View` option on a Split View that is not in a group will not displaye the Split View as expected
2020300
Untriaged
Iframe load event doesn't fire after content script injects style element
2020410
Settings UI
Search suggestion settings are visible when `browser.urlbar.quicksuggest.enabled` is `false`
2020553
Privacy: Anti-Tracking
Correct the collection frequency of some canvas hashes
2020926
Tabbed Browser: Split View
Dragging a group label that contains a Split View to an existing window pin area will pin the Split View
2021581
UI Tests
Almost perma [tier2] org.mozilla.fenix.ui.SettingsSearchTest#verifyShowSearchSuggestionsToggleTest | androidx.compose.ui.test.ComposeTimeoutException: Condition (exactly 1 nodes match - when Gecko 150 merges to beta on 2026-03-23
2017513
Other
…
2017622
Other
…
2020174
Other
…
2018102
Other
…
2018103
Other
…
2019372
Other
…
2016329
Other
…
2016349
Other
…
2016351
Other
…
2020906
Other
…
2020275
Other
…
2019287
Other
…
149.0b7
37 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(18.97%)
Known top crash
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(3.42%)
1472062
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate
(3.08%)
1969401
js::gc::detail::ChunkPtrHasStoreBuffer
(2.95%)
1980548
js::gc::HeaderWord::get
(2.48%)
1993404
EnterJit
(2.14%)
1848584
AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot'
(2.01%)
1877111
Uplifts and Backouts
Bug
Component
Summary
1879118
Task Configuration
Coalesce beta CI runs
2006631
Homepage
Replace BrowsingModeManager used for state with AppStore
2009823
Homepage
Have mode persist after dispatching BrowsingModeManagerModeChanged
2012254
Tabs
Custom Tabs' 3-dot-menu is purple (private-browsing-themed), if Firefox Nightly has a private tab in the foreground
2014684
Tabbed Browser: Split View
Dragging a group label that contains a Split View will show it in an unexpected position if the group is placed on the right side of the browser
2014732
IP Protection
Add support for an use only for theses domains list
2015252
Tabbed Browser: Split View
Add 'reverse tabs' menu option to the tab context menu for tabs in a Splitview
2015553
IP Protection
Set paused state in the IPProtectionPanel when proxy is paused
2016344
IP Protection
Websites excluded from VPN show the real location when custom proxy is used and VPN is on
2016380
DOM: Core & HTML
Edge case CSP Violations needs fixing
2016451
Widget: Gtk
Dragging CJK text from external apps to Firefox results in corrupted characters (U+FFFD)
2017030
Tabbed Browser: Split View
Split view is incorrectly activated for a nonsplitview tab when in a collapsed tab group that is dragged
2017484
IP Protection
Add metric for IPP enrollment
2017506
JavaScript Engine
Negative memory values when you run the testcase from bug 1952626 more than once
2018848
General
failed to calculate checksum of: ../work/firefox-149.0/third_party/rust/wast/tests/.gitattributes
2019177
Tabs
Custom Tabs' system tray & navbar are purple (private-browsing themed), if Firefox Nightly has a private tab in the foreground
2019539
Crash Reporting
[macOS] The crash reporter is not displayed if Firefox crashes a second time
2019661
Agent
Prompts shouldn't be automatically closed when only WebDriver classic is used
2020223
Graphics: Text
Update FreeType to 2.14.2
2020503
IP Protection
Add metric for button clicked in IPProtectionAlertManager
2020735
IP Protection
The bandwidth warnings in the VPN panel have UI issues
2020913
IP Protection
VPN main panel shown instead of ‘Get started’ after re-adding to toolbar post 2nd CFR dismissal
2020927
DOM: Navigation
RichTextArea of GWT project is broken in Firefox 148
2020953
DOM: Navigation
Tolerate %VERSION% as a CKEditor 4 version number in the compatibility hack
2020957
IP Protection
"Learn more" links from about:preferences return 404
2021130
Crash Reporting
Do not submit ProcessType for main process crash report submissions
2021236
IP Protection
VPN changes to off state automatically when the VPN panel is reopened
2021306
IP Protection
[L10n] Messaging add-on (infobar) not translated
2021475
Disability Access APIs
Assertion failure: accessible->IsCombobox(), at /builds/worker/checkouts/gecko/accessible/base/nsAccessibilityService.cpp:894
2021724
IP Protection
Replace 3 strings in accordance with legal guidance
2018253
Other
…
2017801
Other
…
2020617
Other
…
2016367
Other
…
2017643
Other
…
2017521
Other
…
2015091
Other
…
149.0b8
32 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(18.10%)
Known top crash
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::GetGCKindSlots
(3.05%)
1472062
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(2.72%)
1472062
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate
(2.54%)
1969401
js::gc::detail::ChunkPtrHasStoreBuffer
(2.49%)
1980548
AsyncShutdownTimeout | IOUtils: waiting for profileBeforeChange IO to complete | JSON store: writing data for 'targeting.snapshot'
(1.89%)
1877111
OOM | unknown | NS_ABORT_OOM | mozilla::dom::ContentChild::RecvConstructBrowser
(1.80%)
2022780
Uplifts and Backouts
Bug
Component
Summary
2007802
Tabbed Browser: Split View
Account for tabs in a splitview in the tab list
2007950
Address Bar
Favicon is misaligned in Firefox Suggest results on certain conditions (302 redirect?)
2014417
Messaging System
Hitting the Escape key on the TOU modal frame will close the TOU modal
2014459
Tabbed Browser
"New" badging on tab note in tab hover preview panel
2017243
PDF Viewer
High frequency Assertion failure: ((bool)(__builtin_expect(!!(!NS_FAILED_impl(rv)), 1))), at /builds/worker/workspace/obj-build/dist/include/nsILoadInfo.h:507
2018915
Search
Home screen widget toggle remains OFF when adding a widget while there is already one added
2019364
Privacy: Anti-Tracking
Collect WebGL's context attributes that are affected by hardware/prefs
2019759
Disability Access APIs
Crash in [@ IPCError-browser | RecvSetEmbedderAccessible Attempt to embed doc which already has an embedder]
2019763
Disability Access APIs
Crash in [@ IPCError-browser | AddChildDoc Attempt to add child doc which already has a parent]
2020094
Disability Access APIs
Perma accessible/tests/browser/e10s/browser_caching_states.js | wrong state bits for [role: document, address: [xpconnect wrapped nsIAccessible]]!got '0', expected 'busy'
2020369
Tabbed Browser
`New` badge for “Add Split View” context menu is not green on Windows and Linux as specified in Figma
2020859
IP Protection
Add an entrypoint option for IPP enroll
2020961
IP Protection
About:preferences has UI inconsistencies compared to Figma
2021592
Graphics
72.64 - 47.25% offscreencanvas_webcodecs_worker_webgl_vp9 offscreencanvas_webcodecs_worker_webgl_vp9 Mean time across 100 frames: + 11 more (Linux) regression on Wed March 4 2026
2021607
Onboarding
Onboarding progress-dots look off-center at the bottom of refreshed onboarding screen, because the dots for viewed cards have extremely low contrast against the background color
2022221
Privacy: Anti-Tracking
"Fix major site issues" setting under Strict Tracking Protection does not persist after restart
2022281
General
action.openPopup() should reject if another panel or context menu is open
2022476
DOM: Navigation
Look for __gwt_activeModules instead of GwtPotentialElementShim in the GWT compat hack
2019309
Other
…
2019808
Other
…
2017894
Other
…
2022034
Other
…
2016373
Other
…
2018113
Other
…
2020091
Other
…
2021925
Other
…
2021627
Other
…
2018430
Other
…
2011129
Other
…
2018379
Other
…
2022243
Other
…
2022676
Other
…
149.0b9
24 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(16.22%)
Known top crash
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(3.77%)
1472062
js::gc::detail::ChunkPtrHasStoreBuffer
(3.00%)
1980548
EnterJit
(2.84%)
1848584
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate
(2.23%)
1969401
js::gc::HeaderWord::get
(2.08%)
1993404
AsyncShutdownTimeout | quit-application | newtabTrainhopAddon scheduleUpdateTrainhopAddonState shutting down
(1.92%)
2016440
Uplifts and Backouts
Bug
Component
Summary
2007810
New Tab Page
new tab page always empty/gray/grey, tab tooltip shows it as about:blank but settings list about:newtab as url to open
2014304
Audio/Video
tab preview for netflix oddly corrupted
2014420
Messaging System
Unable to Navigate from the TOU Manage Diagnostic button to the Continue button using the Tab key
2015551
IP Protection
Update IPP sign up link parameters
2019952
New Tab Page
AboutNewtabResourceMapping should not return a null addonVersion when using the built-in instance of newtab
2020556
Networking
Intermittent application crashed [@ mozilla::net::DocumentLoadListener::FinishReplacementChannelSetup] | single tracking bug
2020773
General
userScripts in MV2 sandbox does not have a fix for the structuredClone regression
2021482
DOM: Security
CSP errors related to the recent about:blank change, possibly specific to iframes
2021902
WebExtensions
[Regression] Incorrect AddonUpdaterWorker initialization due to WorkFactory using reflection
2022372
Frontend
tabs.move() does not return tabs that were moved in a split view
2022389
WebAuthn
Passkeys no longer function properly
2022584
Other
startup crash in content processes with Trellix on ARM64
2022612
UI Tests
Span API ends and trim devices in robo-arm config
2022643
Preferences: Backend
Allow UTF-8 BOM at the beginning of a pref file
2023178
Toolbar
Set report site issue feature for release to default true
2023383
Graphics
use image::SurfaceCache::IsLegalSize over gfx::Factory::AllowedSurfaceSize in SourceSurfaceSharedDataWrapper
2020190
Other
…
2016661
Other
…
2016664
Other
…
2021863
Other
…
2022351
Other
…
2015267
Other
…
2020030
Other
…
2022733
Other
…
149.0b10
27 bugs uplifted
Show crashes
Hide crashes
Show bug fixes
Hide bug fixes
OOM | small
(16.77%)
Known top crash
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateTenuredCellInGC
(4.57%)
1472062
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::AllocateTenuredCellInGC
(3.66%)
1921815
XREMain::XRE_main
(3.35%)
1928888
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::TenuringTracer::allocCell
(2.13%)
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::AutoEnterOOMUnsafeRegion::crash | js::Nursery::maybeMoveRawBufferOnPromotion
(1.83%)
1472062
OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash_impl | js::gc::FreeSpan::allocate
(1.83%)
1969401
Uplifts and Backouts
Bug
Component
Summary
1986801
SVG
Intermittent svg/text/simple-anchor-end-bidi.svg == svg/text/simple-anchor-end-bidi-ref.html | single tracking bug
2007259
Storage: Cache API
Perma for some test platforms TEST-UNEXPECTED-ERROR | dom/cache/test/marionette/test_caches_delete_cleanup_after_shutdown.py CachesDeleteCleanupAtShutdownTestCase.test_ensure_cache_cleanup_after_unclean_restart | marionette_driver.
2015935
Nimbus Desktop Client
Adding Adaptive Performance Prefs to Nimbus Manifest
2020303
Settings UI
Confusing/wrong string for pop-up and third-party redirect exceptions
2020546
JavaScript: WebAssembly
Ion optimization bug: `WasmI31RefGet` congruent_to ignores semantic argument `wideningOp`
2020992
Layout: Images, Video, and HTML Frames
Video tag with object-fit and sizes defined are overflowed if `overflow:hidden` is defined
2021440
IP Protection
Always authenticate when enrolling to use the VPN
2021555
IP Protection
1GB of bandwidth is used at VPN turn ON
2022273
Settings UI
Browser layout preferences: icons for horizontal tabs and vertical tabs have double shadows and borders
2022322
IP Protection
Remove rechecking the bandwidth usage on IPP panel open
2022473
Widget: Gtk
Drag and drop not working in Firefox 148 XWayland
2022587
IP Protection
Refresh the bandwidth usage when IPPProxyManager stops
2022614
Onboarding
Clean up the onboarding refresh layout
2022865
IP Protection
Error displayed before PAUSED state when max bandwidth limit is exceeded
2023015
IP Protection
IPPProxyManager connection is not stopped when paused while activating
2023291
IP Protection
Update upgrade link UTM params
2023389
Performance Monitoring
SVG favicons are not displayed in about:processes
2023509
Onboarding
Page indicator should not leave trace
2023750
IP Protection
Refresh VPN usage when an entitlement exists for an account.
2022090
Other
…
2020699
Other
…
2021922
Other
…
2022567
Other
…
2021695
Other
…
2022351
Other
…
2022478
Other
…
2023384
Other
…
Last beta shipped
No build
1 bug uplifted
Show bug fixes
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Uplifts and Backouts
Bug
Component
Summary
1855364
General
High frequency toolkit/components/extensions/test/mochitest/test_ext_browserAction_openPopup_windowId.html | single tracking bug