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Nightly builds (crashes and bug fixes)

«  Saturday, January 31, 2026 

#

Outstanding bugs
Bug Component Impact Summary
780985 Layout 4
severity 2
type 2
testcase from bug 460389 triggers "ASSERTION: Placeholder relationship should have been torn down already; this might mean we have a stray placeholder in the tree."
2003657 Machine Learning: Frontend 1
type 1
add icons to top of sidebar layout, e.g., new chat
2004195 General 4
priority 3
type 1
Replace `android-components` RFC process with Android-wide RFC process
2005262 WebRTC 16
priority 5
severity 2
type 2
keywords 7
Google Meet Crash | Crash in [@ abort | webrtc::webrtc_checks_impl::WriteFatalLog]
2009019 Firefox-CI Administration 1
type 1
Support actions in Github based Gecko Decision tasks
2010698 Browser Engine 1
type 1
Add initial interfaces to S2S concept modules
2010713 Layout 1
type 1
Support baseline-shift property for SVG text
2012212 Machine Learning: Frontend 2
type 1
see_also 1
make sidebar smartbar and user message bubbles more responsive
2012515 New Tab Page 1
type 1
Newtab remove v2 spoc personalization code
2012590 Telemetry 1
type 1
add support for permit_non_commutative_ipc to Quantity
2012995 Settings UI 18
priority 5
severity 5
type 2
keywords 2
tracking_firefox148 4
[a11y] The What will be Blocked items from the Block all AI enhancements prompt are not read out loud by screen readers
2013333 General 1
type 1
Favor runtime DLLs from the application directory rather than the system directory on failure paths
2013416 New Tab Page 0
Add activation window infrastructure to newtab
2013483 Mochitest 1
type 1
Mochitest shutdown leaks should have better structured logging
Other bugs
Bug Component Impact Summary
1775003 Layout 3
severity 1
type 2
"ASSERTION: Shouldn't be incomplete if availableBSize is UNCONSTRAINED" on 474075.html
1939578 General 4
priority 1
severity 1
type 2
Intermittent subprocess.CalledProcessError: Command 'hdiutil detach "/Volumes/Firefox Nightly" -quiet' returned non-zero exit status 16.
1948448 UI Tests 4
priority 1
severity 1
type 2
Intermittent [tier 2] org.mozilla.fenix.ui.EnhancedTrackingProtectionTest#disablingETPOnAWebsiteAddsItToExceptionListTest | single tracking bug
1974591 WebRTC 6
priority 1
severity 1
type 2
keywords 2
High frequency browser/base/content/test/webrtc/browser_devices_get_user_media_queue_request.js | notification panel open - | single tracking bug
1996681 Translations 3
priority 3
Remove old translations C++ DOM code
1998262 CSS Parsing and Computation 0
[css-attr] Style sharing: Exclude attr()-using styles from sharing by rules
1998604 Storage: Quota Manager 5
priority 3
severity 2
Make all write access to OriginInfo::mUsage to go through a method
2000283 Gecko Profiler 8
priority 3
severity 2
type 2
see_also 1
sync-about-blank: EndExecutionTracingAsync runnable leaks
2005190 Form Autofill 4
priority 4
Refactor GeckoViewAutocomplete Interface to Support Relay Integrations
2006668 Graphics: Canvas2D 4
type 2
keywords 2
Assertion failure: !mOffscreenCanvas, at /dom/canvas/OffscreenCanvasDisplayHelper.cpp:600
2009534 IP Protection 4
priority 4
Update "connected" and "disconnected" states when turning off/on the VPN
2009535 IP Protection 4
priority 4
Add a "connected" + "excluded" state when the VPN is on, but the current site is excluded
2009780 Interventions 9
priority 4
severity 5
type 2
regressions -2
Persist our webcompat intervention and SmartBlock content scripts across sessions.
2010025 General 0
Add mochitest-timings jobs similar to the xpcshell-timings jobs
2010334 Firefox-CI Administration 0
Enable cron in enterprise-firefox
2010897 Machine Learning: Frontend 0
Window Switcher Feature Callout (in Smart Window)
2011678 Machine Learning: General 0
fix tool definition get_page_content()
2011727 Form Autofill 0
Autocomplete listboxes for bugzilla looks rather odd
2012159 UI Tests 2
type 2
Adjust shard count in experimental-arm
2012160 Task Configuration 0
add standard tags to decision tasks and tasks created by morph
2012412 Inspector 7
priority 3
severity 2
type 2
[computed panel] nested media query declaration isn't displayed in matched selector section
2012755 Security 4
type 2
keywords 2
Adding a DoH exception from about:neterror doesn't work if the URL has a port.
2012791 Audio/Video: Web Codecs 2
type 2
Assertion failure: mIsValid (Invalid checked integer (division by zero or integer overflow)), at /builds/worker/workspace/obj-build/dist/include/mozilla/CheckedInt.h:415
2012827 IP Protection 0
Add divider under "Use VPN for this site"
2012842 Layout: Positioned 6
severity 2
type 2
duplicates 2
Abspos frame with another abspos frame as absolute container does not receive the unfragmented containing block size
2012849 CSS Parsing and Computation 5
priority 3
severity 2
Move out of mako for longhand properties metadata.
2012955 Remote Settings 8
priority 3
severity 2
type 2
see_also 1
Since v147 Firefox stops responding [@ remote_settings::RemoteSettingsService]
2013000 Address Bar 5
priority 5
Move sanitizeTextFromClipboard to UrlbarUtils
2013122 Audio/Video: cubeb 5
priority 5
update cubeb repos and bump cubeb-sys to 0.32
2013141 CSS Parsing and Computation 3
priority 3
severity 2
regressions -2
Move out of mako for shorthand property metadata.
2013162 Settings UI 5
priority 4
severity 1
AI Controls UI polish
2013309 Inspector: Rules 0
Check for disabled declarations in checkRuleViewContent
2013327 Inspector 2
type 2
[computed panel] wrong matched selector order when rule applying on parent element is important
2013348 IP Protection 0
Removed unused site settings subview
2013394 Networking: Cache 8
priority 4
severity 2
type 2
Decompression errors with Google search results after shopify/chatgpt fixes
2013401 MFBT 0
Maybe<int> implementation is suboptimal
2013419 UI Widgets 9
priority 5
severity 2
type 2
Dismissed moz-message-bar does not reappear if applicable in the same session
2013439 Layout 2
type 2
IntersectionObserver on a fragmented element doesn't deal with later continuations correctly
2013440 Machine Learning: Frontend 2
type 2
Fix AI window theme not responding to addon theme changes when only AI windows are open
2013484 Graphics 0
Allow (de)serializing AndroidHardwareBuffer across processes
2013490 Machine Learning: On Device 0
Add profiler markers to the security layer
2013497 WebRTC: Audio/Video 11
priority 5
severity 2
type 2
keywords 2
Cannot have two camera tracks for similar-enough constraints on Android
2013501 Startup and Profile System 0
Turn copy assignment into move assignment in chrome/
2013504 DOM: Navigation 0
Turn copy assignment into move assignment in docshell/
2013524 UI Tests 0
Fix UI tests affected by compose snapshot state being observed from multiple threads when typing text to the search bar
2013525 File Handling 0
Turn copy assignment into move assignment in uriloader/exthandler/
2013526 DOM: Selection 0
2.45 - 2.03% speedometer3 TodoMVC-Preact-Complex-DOM/Adding100Items/Sync / speedometer3 TodoMVC-Lit-Complex-DOM/Adding100Items/Sync + 1 more (OSX) regression on Wed January 21 2026
2013535 Networking: JAR 0
Turn copy assignment into move assignment in modules/libjar
2013621 Theme 0
--toolbar-bgcolor on body breaking Smart Window UI (content area is now grey instead of transparent revealing the purple gradient window background)
2013635 WebRTC 0
turn off mem stats in nrappkit/nICEr
2013666 Layout 0
Perma [tier 2] /scroll-animations/css/scroll-timeline-shorthand.html | Shorthand contraction of scroll-timeline-name:--a, --b:undefined;scroll-timeline-axis:inline, inline, inline:undefined - expected FAIL
  1. js::gc::ChunkMarkBitmap::markIfUnmarked (50.00%)
  2. pushbuf_dump (50.00%)