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
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
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
1994231	Search with bookmark keywords doesn't work when browser's lagging	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
2008529	Automation test has significant performance drop in Firefox 140 and 144	UNCONFIRMED
2008564	UI freezes on long React/DOM sessions despite moderate CPU usage (main-thread JS long tasks)	UNCONFIRMED
2008927	Choppy/stuttering scrolling with touchpad	UNCONFIRMED
2011874	hilversum.bestuurlijkeinformatie.nl - Unable to load the PDF, page is slowing down	NEW
2012760	Jank and freezing on snowplowmap.a2gov.org	NEW
2014947	Firefox uses excessive memory and freezes entire laptop	UNCONFIRMED
2014974	Navigating to a nonexistant URL (http://codegen.py/) spends time on the mainthread and TC thread doing js-parsing.	NEW
2015370	Link previews becomes stuck with constant high CPU usage until process killed	UNCONFIRMED
2015721	www.gradcracker.com - Scrolling isn't smooth	NEW
2016616	With many tabs open in vertical tabs mode, hover prelight (and text preview card without thumbnail) is very laggy	UNCONFIRMED
2016986	Migrate Android PGO training to native arm64 emulator	NEW
2017563	codepen.io - It scrolls the page from time to time when using the mouse wheel to zoom in/out the SVG	NEW
2017841	Firefox 147.0.* is very slow with many open tabs	UNCONFIRMED
2018047	Resource draining issue	UNCONFIRMED
2018136	kde.org - High CPU usage when scrolling through the videos on the page	NEW
2019926	shellshock.io - Mouse input sensitivity shows performance issues (page states to use Chrome for a better experience)	NEW
2021898	Resizing the vertical tabs sidebar is extremely slow and laggy	UNCONFIRMED

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

Awaiting response to needinfo

Full Query

ID	Summary	Status
1961523	Firefox constantly freezes	UNCONFIRMED

1 Total; 1 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Recently opened bugs with performance keywords in the summary

Full Query

ID	Summary	Status
2018858	Move performHapicFeedback to nsIWidget	ASSIGNED
2018960	Firefox 148.0 Desktop: translations settings windows always empty	NEW
2019111	Several WebGPU CTS tests run much slower on debug builds and time out	NEW
2019140	Local translation does not work if javascript.options.wasm_baselinejit is set to false	UNCONFIRMED
2019190	Android UI redesign - Performance issue with Tabs	UNCONFIRMED
2019323	ArrayBuffer with a large maxByteLength on Windows causes an Uncaught out of memory error (eager commit / no-on-demand allocation)	NEW
2019441	Crash when running webgpu through slang demo website	UNCONFIRMED
2019566	Testcase creating N empty textnodes and then appending them in bulk is 60x slower in Firefox (looking up prev sibling from MaybeInvalidateForAppend)	NEW
2019588	Support Counters (CPU, Memory, ...) on tier3 platform	NEW
2019679	WebRender GPU texture corruption and memory leak triggered by CSS animation (opacity + transform) on Windows 11 with NVIDIA RTX 40 series.	UNCONFIRMED
2019692	display user sent message immediately for better perceived performance	NEW
2019753	The about:translations page does not correctly hide the Translations URL-bar button when switching from another tab	NEW
2019868	Poor layer compositing performance under ARM Fedora KDE Linux (asahi mac)	UNCONFIRMED
2019923	Support PerformanceResourceTiming API contentEncoding field	NEW
2020011	[wpt-sync] Sync PR 58114 - LCP: remove .tentative from performance-entry-sequence.html test	NEW
2020076	[wpt-sync] Sync PR 58125 - [focusgroup] Rename no-memory modifier to nomemory	NEW
2020158	UI regression on Android: recent redesign breaks established navigation muscle memory	UNCONFIRMED
2020202	AI enhancements need to be active for on-device translations	UNCONFIRMED
2020272	Backspace sometimes does not work right, slow and delayed	UNCONFIRMED
2020313	[wpt-sync] Sync PR 58169 - webdriver: Enable `pointerMove` to perform smooth transition over specified duration	NEW
2020373	Intermittent mozilla/tests/webgpu/cts/webgpu/shader/execution/expression/call/builtin/refract/cts.https.html | single tracking bug	ASSIGNED
2020386	Fenix navigation performance regresses more than Chrome when accessibility is enabled in raptor tests	NEW
2020475	[GV] Update TranslationsController to Accomodate AI Controls by Adding Errors	NEW
2020537	[wpt-sync] Sync PR 58201 - [focusgroup] Reland: Rename no-memory modifier to nomemory	REOPENED
2020567	13.35 - 6.46% perf_reftest coalesce-2.html + 2 more (Linux) regression on Tue February 24 2026	NEW
2020649	The ‘More translations settings’ page flickers when refreshing the browser	NEW
2020678	Explore Using DeferredTask for about:translations Page Throttle and Debounce	NEW
2020697	Ensure about:translations Test Click Events are A11y Friendly	NEW
2020753	up to five times increase in GPU D3D usage when playing video in 148.0 and onward compared to 147.0.4	UNCONFIRMED
2020757	Firefox has high CPU and network traffic when in background from email link	UNCONFIRMED
2020764	Update WebGPU CTS to new version d213d4b8dba58ca7a0685e30cfaf1d29f4fc5d5b from 2026-02-26 21:18:31	NEW
2020771	Add WebGPU adapter limits/features telemetry	ASSIGNED
2020827	Enforce a limit on memory length, e.g. 100 characters	NEW
2020841	Ensure about:translations MessageBar Headers Do Not Have Periods	NEW
2020857	[wpt-sync] Sync PR 58236 - Fix multicol perf regression due to gap decoration invalidation scoping	NEW
2020980	Change the type of maker.data.type from string to integer to reduce memory footprint	ASSIGNED
2021072	MIDI-related demos at https://www.keijiro.tokyo/WebGPU-Test/don't work	NEW
2021073	Emulator startup should fail fast and loudly if headless isn't supported	NEW
2021088	Fix and re-enable dynamic chunking for WebGPU CTS	NEW
2021108	Creating a taskbar tab for a Slack workspace opens a generic selection window when opened	NEW
2021269	Tabs should show the notification bubble for that tab when the Assistant automatically performs a search instead of switching to it	NEW
2021304	Clearing CascadeData / SelectorMap causes significant main-thread jank	NEW
2021306	[L10n] Messaging add-on (infobar) not translated	ASSIGNED
2021311	Add Perf Profiler Markers for various components for Smart Window workflow	NEW
2021345	Move WebSerial reads to a separate thread for performance/power reasons	NEW
2021604	Paper size drop down in printer dialog not translated	UNCONFIRMED
2021609	Translate this page refreshes page when showing original	UNCONFIRMED
2021701	Jank/jump when touch-scroll chains from a nested scroll container to a scroll-snap-type: y mandatory parent	UNCONFIRMED
2021723	Very slow code generation for Ruffie	UNCONFIRMED
2021729	using Firefox 148.0 on Win11 Pro and Home PCs Firefox 148.0 is supposed to translate Chinese to English without extension NOT WORKING	UNCONFIRMED
2021736	No longer possible to perform a search by drag and dropping text in the tab bar	UNCONFIRMED
2021755	Animations in www.iranmonitor.org cusing high GPU usage on Firefox	UNCONFIRMED
2021766	Translation from Danish to English changes numbers to incorrect value	NEW
2021867	Add additional slow start telemetry with new neqo v0.23.1 stats	ASSIGNED

54 Total; 54 Open (100%); 0 Resolved (0%); 0 Verified (0%);