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Nightly builds (crashes and bug fixes)
This is a staging environment for whattrainisitnow.com

«  Friday, December 12, 2025 

#

Outstanding bugs
Bug Component Impact Summary
1085214 DOM: Window and Location 18
priority 3
severity 2
type 1
keywords 2
duplicates 2
webcompat 3
cc 3
see_also 2
Implement Location.ancestorOrigins
1992011 Menus 1
type 1
Brand Refresh MVP - Update wordmark in About Firefox popup
1994263 Lint and Formatting 1
type 1
Refactor token stylelint rules into a single use-design-tokens rule
1999828 JavaScript Engine: JIT 5
priority 4
type 1
Splay benchmark unfortunate dual-shape access and store.
2003204 Settings UI 1
type 1
Open customization panel from about:preferences#home sections in Settings Redesign update
2004445 New Tab Page 5
priority 4
type 1
Add ./mach newtab mach get-unbranded-builds command to generate OS-specific links for easy access
2005495 DOM: Forms 3
type 1
keywords 2
Stop updating the already opened datetime picker when the input value is changed
2005524 Machine Learning: General 1
type 1
Insights drift detector for generation from history
Other bugs
Bug Component Impact Summary
1728746 DOM: Editor 3
severity 1
type 2
Incorrect character backspace behavior for compound emoji
1959738 File Handling 8
priority 4
severity 2
type 2
Firefox can miscalculate allowed filename length for "save page as" complete due to the localized _files folder suffix replacing the extension, leading to broken file saves
1971841 Settings UI 0
Convert Sync section to config-based prefs
1984493 Graphics: WebGPU 7
priority 5
severity 2
Migrate wgpu to objc2 and associated crates
1986810 Tooling 1
see_also 1
Update the OSS Licenses Gradle Plugin to version 0.10.10
1990419 CSS Parsing and Computation 6
priority 4
severity 2
Implement initial support for CSSNumericValue reification of <length> values
1994277 Tabs 0
[Tab Management Search] Add search bar to the Search UI
1998761 DOM: Navigation 4
severity 2
type 2
Navigation API Key isn't copied over to new entry for cross-document replace navigations
1998975 New Tab Page 4
priority 4
Remove Thumbs Up/Down feature from newtab
2001752 Toolbars and Customization 3
priority 3
Record probe for actions in the List all tabs (TOM/overflow) menu
2002407 Layout: Scrolling and Overflow 8
priority 4
severity 2
type 2
Drop mOnlyIfPerceivedScrollableDirection option for ScrollFrameIntoView
2003843 Graphics: WebRender 7
severity 2
type 2
duplicates 2
see_also 1
anchored elements can incorrectly be drawn with the transform of the anchor
2004080 Homepage 0
When there's only one row of top sites, remove the extra space below it.
2004518 IP Protection 0
Remove site inclusions and "select" mode support from Firefox VPN settings page
2004542 Browser Engine 10
type 2
keywords 7
see_also 1
Crash in [@ org.mozilla.gecko.EventDispatcher$QueryException: at org.mozilla.gecko.EventDispatcher$CallbackResult.sendError(EventDispatcher.java)]
2004833 Graphics: WebRender 4
severity 2
type 2
use scroll-linked-effects code for anchor pos scrolling we can't represent as async scrolling to improve experience
2004888 Machine Learning: Frontend 0
[FirstRun] Create Firstrun.html opening firstrun welcome screen
2005060 Tabbed Browser 0
The first time about:opentabs is opened, It's showing about:newtab behind it at full width
2005169 Layout: Scrolling and Overflow 0
Perma [tier 2] /css/css-overflow/overflow-img-border-radius.html | Testing http://web-platform.test:8000/css/css-overflow/overflow-img-border-radius.html == http://web-platform.test:8000/css/css-overflow/overflow-img-ref.html | single tracking bug
2005255 Other 13
severity 5
type 2
keywords 2
tracking_firefox146 4
startup Crash in [@ ntdll.dll | inprocessclient64.dll | mozilla::interceptor::FuncHook<T>::operator()] with SentinelOne
2005324 Networking 2
type 2
Add markers for HTTP channel Cancel.
2005345 Machine Learning: Frontend 0
Add service-type in request header to API call in openai pipeline
2005439 General 0
Running "mach macos-sign -v" on linux fails: xattr subprocess failed with exit code 64
2005445 General 0
Running "mach macos-sign -v" on linux fails: TypeError: subprocess.run() got multiple values for keyword argument 'check'
2005526 Layout: Positioned 7
priority 3
severity 2
type 2
Fix position-area alignment for popovers (auto margins)
2005534 Tabbed Browser 0
Using the Add Split View on a single tab and then selecting an open tab will not show the Split View as expected
2005544 New Tab Page 0
Send the OHTTP preflight unconditionally when configured to communicate with MARS over OHTTP
2005545 New Tab Page 0
Communicate with MARS over OHTTP by default
2005549 New Tab Page 0
Bump the minor version number of New Tab from 148.0.0 to 148.1.0
2005573 DOM: Navigation 4
severity 2
type 2
Navigation::SetCurrentEntryIndex does some bad logging
2005590 Machine Learning: Frontend 2
type 2
Handle AI Window Opening From Within BrowserWindowTracker
2005612 SVG 0
More consistent naming and usage of GetSVGRootElement
2005626 JavaScript Engine 0
Avoid repeated cx->check calls
2005641 JavaScript Engine 0
OffThreadPromiseRuntimeState::dispatchDelayedTasks spends a surprising amount of time in mach_absolute_time on macOS
  1. xkb_keymap_ref (18.18%) Top crash
  2. mozilla::net::nsSocketTransportService::AttachSocket (13.64%) Top crash
  3. mozilla::detail::VectorImpl<T>::new_ (9.09%)
  4. mozilla::dom::WindowGlobalParent::CreateDisconnected (9.09%)
  5. wgpu_bindings::server::process_message (9.09%)
  6. CrashChannel::OpenContentStream (4.55%)
  7. HandleGLibMessage (4.55%)
  8. js::gc::detail::ChunkPtrHasStoreBuffer (4.55%)
  9. mozilla::MozPromise<T>::ThenValueBase::ResolveOrRejectRunnable::~ResolveOrRejectRunnable (4.55%)
  10. mozilla::detail::InvalidArrayIndex_CRASH | nsTArray_Impl<T>::ElementAt | nsTArray_Impl<T>::LastElement | mozilla::webgpu::SharedTextureDMABuf::ToSurfaceDescriptor (4.55%)
  11. mozilla::dom::ClientSource::SetController (4.55%)
  12. mozilla::dom::Navigation::UpdateEntriesForSameDocumentNavigation (4.55%)
  13. mozilla::ipc::FatalError | mozilla::ipc::IProtocol::HandleFatalError | IPC::ParamTraits<mozilla::SerializedStructuredCloneBuffer>::Write | IPC::ParamTraits<mozilla::dom::ClonedMessageData>::Write | IPC::ParamTraits<mozilla::dom::ClonedOrErrorMessageDat... (4.55%)
  14. onepin-opensc-pkcs11.dll | FlsGetValue (4.55%)