Performance/Triage/Queries/General

Untriaged

Full Query

ID	Summary	Status
1771902	Compositor CSS animations are not paused in fully occluded windows	NEW
1777875	Lenovo Privacy Guard with "Enable this feature when typing passwords" causing excessive UI responsiveness delays (jank)	NEW
1931717	[meta] High OOM rate and CC time in YouTube	NEW
1939354	RAM too much	UNCONFIRMED
1941716	On a fresh profile, Negative heap-unclassified on "My Bugs" query on b.m.o	NEW
1943419	Fluidd memory leak	UNCONFIRMED
1946913	Consume too much memory	UNCONFIRMED
1949252	Meta Messenger causing high CPU load	UNCONFIRMED
1955077	Firefox freezes and cause Windows hang when access certain websites	UNCONFIRMED
1956850	Ublock Origin increases the time to load a simple demo by 4x and uses ~3x more RAM (time spent in wrappercache, proxy, xraywrapper, minorGC and related stuff)	NEW
1959837	openstreetmap iD editor - slow zooming	NEW
1964374	x.com - Scroll lagging after performing a subsequent query	NEW
1964744	high cpu memory youtube	UNCONFIRMED
1966492	JS isn't minified in Fenix release builds	NEW
1968418	Closing a long-running twitch tab hangs browser for minute(s) (GC in recvConduitClosed of Conduit)	NEW
1975348	EspnCricInfo site creates massive CPU and Memory usage FF140.0.2	UNCONFIRMED
1988312	www.pexels.com - Stuttering/choppy scroll	NEW
1988605	Facebook search bar animation stutters on Firefox	UNCONFIRMED
1988608	Tabs in Firefox refresh when multitasking	UNCONFIRMED
1988776	MutationObserver's getReceiverFor is slow when there are a lot of observers	NEW
1993778	Firefox causes MacBook battery to drain fast	UNCONFIRMED
1994817	Firefox CPU usage spikes to 100%+ on some sites, particularly when opening new tabs	UNCONFIRMED
2001588	Zooming in and out on https://www.tcm.com/schedule is slow	UNCONFIRMED
2001751	145.0.1 hogs cpu	UNCONFIRMED
2002153	Laggy Youtube in-Video UI	UNCONFIRMED
2002795	Horrible new tab bar	REOPENED
2003583	chase.com - 145.0.2 is incompatible with Chase Online Banking features	UNCONFIRMED
2005548	High ram usage in Youtube site when uBlock Origin is enabled.	UNCONFIRMED
2005635	decathlon.fr website consuming CPU while not displayed	UNCONFIRMED
2006540	Extensions Using 150% CPU During Normal Browsing	UNCONFIRMED
2007610	"This page is slowing down Firefox. To speed up your browser, stop this page." error	UNCONFIRMED
2007827	Slow upload speed in Firefox 146.0.1 compared to Microsoft Edge	UNCONFIRMED
2008564	UI freezes on long React/DOM sessions despite moderate CPU usage (main-thread JS long tasks)	UNCONFIRMED
2010982	New tab takes a long time to load	UNCONFIRMED
2011031	Page does not load in FF, does load in Edge	NEW

35 Total; 35 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Awaiting response to needinfo

Full Query

ID	Summary	Status
1961523	Firefox constantly freezes	UNCONFIRMED
1981274	utter-disappointment-with-firefox-performance	UNCONFIRMED
1982631	Google Maps takes forever to load	UNCONFIRMED

3 Total; 3 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Recently opened bugs with performance keywords in the summary

Full Query

ID	Summary	Status
2009295	Cache Storage API cache.match() operations exhibit O(n) performance degradation causing severe slowdowns as cache size grows	ASSIGNED
2009306	Benchmark from bug 2009295 (https://ylngxt.csb.app/) is 3x slower in Firefox to write the first 5000 URLs to cache	NEW
2009372	Fenix: DoH performance shows high latency when resolving multiple hostnames in parallel (bis)	NEW
2009394	Consider implementing faster date conversion algorithm	NEW
2009402	[Experiment] The “Updated sidebar coming soon” callout message is dismissed by the Translate door hanger when navigating to a website in a foreign language	NEW
2009506	[WebGPU] [aarch64] [arm64] @ dri2_allocate_textures	UNCONFIRMED
2009606	[wayland] vsync with frame callbacks causes high CPU load and works badly with VRR	NEW
2009633	Clean up unnecessary logic in TranslationMenuItem	NEW
2009639	Modified Codepen demo is 1.5x slower than Chrome, getting slightly slower as iterations increase. Looks to be time spent in JSON serailization.	NEW
2009763	Memory leak in HomeFragment – CoordinatorLayout retained after onDestroyView()	NEW
2009834	[Linux/Firefox Nightly - Vertical Tabs] Excessively high CPU Usage when mousing into collapsed vertical tabs.	UNCONFIRMED
2009871	Enable WebGPU on Android Nightly	NEW
2009894	The DocumentFragment counterexample benchmark on MDN has rapid runaway memory with Firefox.	NEW
2010059	Resolve memory leaks in TabbedBrowsingTest#verifyCloseAllPrivateTabsNotificationTest	NEW
2010062	Add message length threshold before generating memory from conversation	NEW
2010069	Localize remove this memory label	NEW
2010070	Enable GPU support for onnx-native	NEW
2010079	Surprisingly high CPU usage in GMP process telemetry	NEW
2010135	[fluent-dom] While translating an element with fluent ID "newtab-topsites-add-shortcut-label" a child element of type "br" was removed.	NEW
2010336	Perfspewer with IONPERF=src has too much overhead	NEW
2010353	Assertion failure: !mFinishedBuildingColumns (Should only call once!), at /builds/worker/checkouts/gecko/layout/generic/ColumnSetWrapperFrame.cpp:107	NEW
2010399	Consider Adding Favicon and Address Bar Treatment to about:translations	NEW
2010402	memory.grow is not correctly implemented for custom page sizes	ASSIGNED
2010414	Prototype static memory protection	NEW
2010569	`background-clip: text` applied element loses background when moved with `transform: translate()`	UNCONFIRMED
2010582	Slowing down then crashing	UNCONFIRMED
2010615	Compression dictionaries URLPattern parsing slow on shopify	ASSIGNED
2010633	Perma browser/extensions/newtab/test/xpcshell/test_WallpaperFeed.js | test_Wallpaper_protocolURI - [test_Wallpaper_protocolURI : 242] Should dispatch WALLPAPERS_CUSTOM_SET with moz-newtab-wallpaper:// URI - when Gecko 148 merges to release on 2026-02-16	NEW
2010672	Collect WGPU Adapter information	NEW
2010993	Make Translations UI States Reactive to Changes in Feature Enabledness	NEW
2011001	Translation of open websites in the background no longer works	UNCONFIRMED
2011051	sign(-1.0) in webgpu/wgsl returns nonsense in Firefox on Windows	UNCONFIRMED
2011080	Testcase adding N attributes to range-sliders is 3x-4x slower than Chrome. Both the browsers are quadratic, Firefox is more quadratic.	NEW
2011082	WebGPU on Apple Silicon causes system-wide video/animation stutter	UNCONFIRMED
2011216	Searches performed from new search bar navigate away from pinned tabs rather than open new tabs.	ASSIGNED
2011220	Middle clicking alternate engines should perform a search on the current search bar text in a new tab	NEW
2011228	Add inlining information to Perfspewer jitdump	NEW
2011331	Update WebGPU CTS to new version 0ca53dd3c9cddbe596fd2766a717354edd005513 from 2026-01-19 16:06:47	ASSIGNED
2011444	Closing tab search window and dismissing keyboard leads to slower transition	NEW
2011505	Enable islamic-umalqura calendar by default	ASSIGNED
2011551	Translations popup is not translated	NEW
2011556	Update wgpu to upstream (week of 2026-01-19)	ASSIGNED
2011593	Testcase creating a big DOM, and toggling display:none and hidden is 2x-5x slower than Chrome. Seems to spend long time in Layout (anchorpos, IsLineClampRoot, nsLineBox::IsEmpty, StyleBorder)	NEW
2011676	Memory leak in FenixSearchMiddleware retaining destroyed HomeActivity, HomeFragment, NavHostFragment, and BrowserFragment	NEW
2011719	[wpt-sync] Sync PR 57280 - Update DeviceMemory thresholds	NEW
2011815	Crash in [@ mozilla::gfx::GPUProcessManager::MaybeCrashIfGpuProcessOnceStable]	NEW

46 Total; 46 Open (100%); 0 Resolved (0%); 0 Verified (0%);