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
1966492	JS isn't minified in Fenix release builds	NEW
1975272	Animated newtab background images consume CPU even when not in the foreground	ASSIGNED
1975348	EspnCricInfo site creates massive CPU and Memory usage FF140.0.2	UNCONFIRMED
1982980	Memory leak in Firefox on Android when repeatedly appending and removing an iframe	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
1999165	Hanging Constantly 144x	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
2002920	Drag-and-drop 5MB of text on an blank tab leads to recurring 4.5s jank on the parent-process, spending time in nsIURIFixup.getFixupURIInfo	ASSIGNED
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

34 Total; 34 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
2007970	Testcase generating N CSS-Anchor Positioning elements is 1.5x-2.5x slower than Chrome, and is quadratic. Spends all the time in treecomparison, FindFirstAcceptableAnchor, resulting in IsFrameAfter(nsIFrame const*, nsIFrame const*)	NEW
2007992	Testcase generating N CSS-Anchor Positioning elements is 3x slower than Chrome, spending all the time in nsTArray_Impl::ApplyIf (mozilla::PresShell::AddAnchorPosPositioned)	NEW
2008052	convert fast-forward-libwebrtc.sh to python for reuse later	NEW
2008053	High CPU usage on YouTube	UNCONFIRMED
2008067	On slow networks, the menu tells me to 'Sign in' when I already am.	NEW
2008103	WebGPU scheduling issues with `onSubmittedWorkDone` and crash on window resize	UNCONFIRMED
2008253	Superfluous ARIA (Recent activity section > story card links)	UNCONFIRMED
2008254	Superfluous list structure (Customize button)	UNCONFIRMED
2008255	Superfluous list structure (Story topic sections > ••• disclosure)	UNCONFIRMED
2008317	[unified trust panel] http-only "Not Secure" shield loses its red slash (making it look more-trustworthy) when you turn off tracking protection	NEW
2008324	motion.dev's site is noticably slower compared to chrome when MacOS has low batery	NEW
2008331	PerformanceNavigationTiming returns -1 timestamps for memory-cache navigations	UNCONFIRMED
2008334	[Document PiP API] When the tab is switched to the background, the animation in the PiP window becomes excessively slow	ASSIGNED
2008380	Hit MOZ_CRASH(attempt to add with overflow) at /third_party/rust/wgpu-core/src/resource.rs:1805	ASSIGNED
2008399	Enable overlay of WebGL/WebGPU by using IDCompositionTexture on Windows in Nightly/Early Beta	NEW
2008506	[BSD] firefox exits with a segmentation fault in headless mode in freebsd cause of having no X-server and gpu	UNCONFIRMED
2008529	Automation test has significant performance drop in Firefox 140 and 144	UNCONFIRMED
2008560	Investigate JS IPDL serialization performance	NEW
2008705	WebGPU: external textures missing on Linux	NEW
2008706	WebGPU: external textures missing on Android	NEW
2008734	Do not reject the promise returned by `navigator.gpu.requestAdapter()`	ASSIGNED
2008779	Memory leak in AboutFragment after onDestroyView via RecyclerView adapter listener	NEW
2008851	Intermittent random flashing rectangles in the Slack web page's blue background when using SWGL	NEW
2008886	[HDR/Windows] Implement zero-copy fast path for P010 format	NEW
2008904	Investigate options of persisting arbitrary data in memory	NEW
2008906	Use MITIGATION_EXTENSION_POINT_DISABLE for the Windows GPU process sandbox.	ASSIGNED
2008960	Remove pref for MITIGATION_EXTENSION_POINT_DISABLE in Windows GPU process sandbox	NEW
2009020	Add Translations to AI Controls	NEW
2009062	memory leaks and freezing	UNCONFIRMED
2009130	WebGPU should not be using the static gfx blocklist	NEW
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
2009395	Give GpuBuffer addresses more bits to work with	ASSIGNED
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
2009490	[perf] optimize BasePrincipal::EqualsForPermission	NEW
2009493	Ensure that those WebGPU WPTs using MediaStreamTrackGenerator remain skipped	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
2009723	wgpu update 2026-01-12	ASSIGNED
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
2009864	Update WebGPU CTS to new version cf6c5cd8e96d97754daa78b9e63976f8f9d84624 from 2026-01-09 21:44:04	NEW
2009871	Enable WebGPU on Android Nightly	NEW

47 Total; 47 Open (100%); 0 Resolved (0%); 0 Verified (0%);