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
1940667	30s of jank on parent-process doing something around getFixupURIInfo and ContentAreaDropListener.sys.mjs (resource://gre/modules/URIFixup.sys.mjs:278:18)	NEW
1941608	Explore AvlTree improvements	NEW
1941716	On a fresh profile, Negative heap-unclassified on "My Bugs" query on b.m.o	NEW
1942031	Bad canvas performance on this example (nokiadesignarchive.aalto.fi)	NEW
1943419	Fluidd memory leak	UNCONFIRMED
1943503	High CPU usage on Debian x64 bookworm (VMware player guest)	UNCONFIRMED
1943841	(With Ublock or "Snap links plus addon") Testcase generating 1000 iframes is 3.3x slower in Nightly and gets superlinearly slower with increase in number of iframes, uses more RAM, and memory doesnt get released fully if you reload the page	NEW
1945665	airbnb.com - Attempting to enter a destination in the search by using the gboard causes the gboard to become unresponsive	NEW
1946248	Too much time spent in gfxMacPlatformFontList::DeprecatedFamilyIsAvailable during startup	NEW
1946913	Consume too much memory	UNCONFIRMED
1949252	Meta Messenger causing high CPU load	UNCONFIRMED
1950073	www.kiwico.com - Checkout page becomes unresponsive	NEW
1950901	Testcase generating N=5K forms (using credential mgmt API?) takes 30s in parent-process and 50s in content process. Chrome takes 9s.	NEW
1955077	Firefox freezes and cause Windows hang when access certain websites	UNCONFIRMED
1955509	Constant CPU usage while idle on the Tiki.org website front page	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
1957692	Testcase generating N=500 forms and submitting them takes 27s in both parent and content processes,and is 675x slower than Chrome (Part2 of bug 1950901)	NEW
1958480	x.com - High battery drain	NEW
1958712	Testcase generating N <META> elements is 20x slower than Chrome and does weird stuff in Compositor and SceneBuilder (PAPZCTreeManager::Msg_UpdateZoomConstraints)	NEW
1959837	openstreetmap iD editor - slow zooming	NEW
1964374	x.com - Scroll lagging after performing a subsequent query	NEW
1965718	Google Maps framedrops when I'm panning the map	UNCONFIRMED
1966492	JS isn't minified in Fenix release builds	NEW
1967143	firefox taking too much memory	UNCONFIRMED
1967585	Excessive memory allocation when toolbar icons are updated (e.g., during downloads or extension changes) — sometimes triggers OOM killer	UNCONFIRMED
1972941	[Linux] File downloading is CPU-intensive	NEW
1975272	Animated newtab background images consume CPU even when not in the foreground	NEW
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
1988762	Slow scrolling performance on particular sites (mastodon)	NEW
1988776	MutationObserver's getReceiverFor is slow when there are a lot of observers	NEW
1993778	Firefox causes MacBook battery to drain fast	UNCONFIRMED
1994431	Firefox with NoScript is nearly unusable on a busy system (pages won't load if CPU is used heavily)	UNCONFIRMED
1994817	Firefox CPU usage spikes to 100%+ on some sites, particularly when opening new tabs	UNCONFIRMED
1999165	Hanging Constantly 144x	UNCONFIRMED
1999598	Firefox for macOS is using a lot of battery	UNCONFIRMED
2000834	www.assembly.ca.gov - Scrolling is slow/sluggish	NEW
2001588	Zooming in and out on https://www.tcm.com/schedule is slow	UNCONFIRMED
2001853	Using Powershell to send mouseclicks to enable/disable UBlock 10000 times takes 10 minutes. Lots of time spent in listeners. glean, and GC. Also makes permanent slowdown/memory increase, and block all networking.	NEW
2001858	Using Powershell, enabling and disabling the alpenglow theme 10000 times takes 125 seconds. Time spent in ipc::SharedMap::Entry::ExtractData and XPCJSContext::RecordScriptActivity, etc.	NEW
2001871	private window seems to slow and crash all of firefox	UNCONFIRMED
2001884	Firefox Freezes	UNCONFIRMED
2002153	Laggy Youtube in-Video UI	UNCONFIRMED
2003401	Firefox 145.0.2 reproducibly locks-up UI	UNCONFIRMED
2003583	chase.com - 145.0.2 is incompatible with Chase Online Banking features	UNCONFIRMED
2003795	store.steampowered.com - GPU usage significantly increases causing performance issue	NEW
2005342	Regular massive memory leak	UNCONFIRMED

54 Total; 54 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
2002674	Memory leak causing linux os to run out of memory if firefox open for several hours	UNCONFIRMED
2002713	Demo at https://dice.clockworkmod.com/ is ~2x slower in Firefox at lower iterations, and 1.2x slower at higher iterations	NEW
2002821	Nvidia GPU 1 crashes when Firefox is returned from minimized state	UNCONFIRMED
2002852	Testcase creating long chains of microtasks is 8x slower with the new microtaskQueue. Spends all the time in MinorGC tracing js::MicroTaskQueueSet::trace and TraceableFifo::trace	NEW
2002859	Add fast path for global atom regexp match	NEW
2002860	Make Translator language sticky when set manually	NEW
2002862	Add fast path for global atom regexp replace	NEW
2002873	Malicious page in the latest Firefox triggers a Web Worker forkbomb that uses heavy memory allocation and IPC flooding to cause a reliable system‑wide denial of service with no interaction beyond loading the page	UNCONFIRMED
2002897	Copying `EnumSet` for params shouldn't cause `performance-unnecessary-value-param` warnings	NEW
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	NEW
2002978	The new search box performs the search with the wrong engine	ASSIGNED
2003203	big performance disparity with Chromium on "figtree" font homepage	UNCONFIRMED
2003226	riscv64: MacroAssembler::wasmCheckSlowCallsite doesn't account for `jal` sequence length	ASSIGNED
2003310	The autocomplete text wiggles as you type "https://" possibly due to the forward-slash characters having special kerning/spacing rules applying and then not-applying and then applying again	NEW
2003329	Open about:translations page from Translate QuickAction in Split View when enabled	NEW
2003348	Consider adding a setting to perform originAttributes isolation on non-isolated sites with Fission	NEW
2003677	[AI Window] [Insights] Performance Testing	NEW
2003817	Make MozURL memory reporting not double report	NEW
2003879	[AI Window] [Semantic Search] Latency and Performance	NEW
2003906	Create perftest to assess cost of subtree recration when CSS visibility on ancestor is changed	NEW
2003950	Too much CPU time spent on Kotlin background threads during startup	NEW
2003963	[wpt-sync] Sync PR 56478 - classifies "translate" web feature	NEW
2003977	A big difference in jank between Firefox and Chromium at 2025.holidayhackchallenge.com	UNCONFIRMED
2004105	Enable WebGPU on Intel Macs	NEW
2004125	Allow import of perfetto traces for android profiles	NEW
2004157	Introduce cache memory statistics via XPCOM	NEW
2004187	--enable-project=memory builds are broken	ASSIGNED
2004397	Newtab frecency-based sorting RS data performance improvements	NEW
2004455	[toolbar redesign] Add telemetry for translate action in toolbar	ASSIGNED
2004471	Display Language Load Error Message in about:translations	NEW
2004473	Display Unsupported Error Message in about:translations	NEW
2004476	Ensure that the about:translations focus order is correct	NEW
2004479	Ensure that the about:translations screen reader experience is correct	NEW
2004717	Add glean telemetry for QUIC slow_start_exited stat	ASSIGNED
2004747	Performance of camerahandapp demo is bad in drawing mode	NEW
2004775	[wpt-sync] Sync PR 56567 - [scoped-VT] Escape scroll-translation on scoped element	NEW
2004790	Investigate options for measuring Android UI/sceen rendering performance	NEW
2005026	Connect VPN bandwith usage with Fastly usage	NEW
2005059	WebGPU: add immediate data API	NEW
2005061	WebGPU: add transient color attachment (AKA transient texture) support	NEW
2005065	WebGPU: support `texture-component-swizzle` feature	NEW
2005093	WebGPU should not overload `ImplCycleCollectionTraverse` and `ImplCycleCollectionUnlink` for arbitrary `nsTArray<RefPtr<T>>`	NEW
2005098	Should `mozilla::webgpu::ExternalTexture` be using the `WEAK_PTR` variants of the cycle collection macros?	NEW
2005126	Sanitizing renderer string fails on Samsung Xclipse GPUs (again)	NEW
2005174	Tweak the wording about "islamic" in DateTimeFormat	NEW
2005225	Full screen mode switch is slower with pinned tabs	NEW
2005283	Is WebKit shaping 50x faster than Firefox?	NEW
2005294	Update wgpu to upstream 500e2bae (2025-12-09)	NEW
2005299	Ensure safe handling of fetch_artifacts function when no memory leak artifacts are returned	NEW
2005317	Implement PerformanceEventTiming targetSelector attribute	NEW
2005341	7.8 - 7.04% damp jstracer.profiler-recording-performance.DAMP / damp jstracer.profiler-recording-performance.DAMP (Linux, Windows) regression on Mon December 1 2025	NEW

51 Total; 51 Open (100%); 0 Resolved (0%); 0 Verified (0%);