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
2016616	With many tabs open in vertical tabs mode, hover prelight (and text preview card without thumbnail) is very laggy	UNCONFIRMED

38 Total; 38 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
2013721	Highlight text selection is slow/inconsistent when Windows 11 taskbar is hidden.	ASSIGNED
2013749	Testcase creating N empty text nodes is 380x slower in Nightly.	NEW
2013750	Testcase creating N empty textnodes and then appending them in bulk is 60x slower in Firefox	NEW
2013766	Firefox seems to have memory leaks when watching YouTube lives	UNCONFIRMED
2013886	Opening about:support janks the parent process for 600ms getting WebGL info	NEW
2013986	Refactor variations of nsLayoutUtils::IsAncestorFrame	NEW
2014160	Cache2 I/O thread 100% CPU due to O(n) linear search in CacheIndexIterator::RemoveRecord with large cache	UNCONFIRMED
2014262	Surface 'Translate' option higher in menu when selecting foreign text	NEW
2014280	RTC.IceConnectionStateChange callbacks can be slow	NEW
2014284	Remove leading slash from NewTabAttributionService endpoint variable	NEW
2014367	[Sample] Bug used as sample for testing file bug functionality in Perfherder	NEW
2014454	Minor but annoying bug in translation triggering. Prompted to translate a JSON API consisting of almost entirely numbers into norwegian.	NEW
2014525	CPU goes to 100%, OffscreenCanvasRenderingContext2D.fillText is calling gfxFontGroup::EnsureFontList & gfxFontGroup::AddFamilyToFontList on every call.	UNCONFIRMED
2014620	When the translation panel appears and I click the "Not now" button, when I refresh the site, this panel is no longer displayed.	NEW
2014639	Autocad Web crashes in firefox if webGPU is enabled.	NEW
2014677	Google Slides rendering unusably slow	UNCONFIRMED
2014840	Reduce memory allocations for filling simple paths (PathBuilder ops vector, Path)	NEW
2014930	./mach lint -l android-fenix is slow (runs heavy Gradle tasks / build steps)	NEW
2014989	Prototype DOM Tree Translation API	NEW
2014998	WebGPU error in Construct 3 on macOS	UNCONFIRMED
2015006	Testcase creating Map keys is 4x slower, and iterating them is 2x slower	NEW
2015083	Text size cannot be increased for Firefox-translations	NEW
2015166	Drawing a WebGPU canvas to a 2D canvas does a readback	NEW
2015175	Improve Memory summary verbosity and detail inclusion	NEW
2015256	Testcases with json operations are 10x-2x slower in Firefox	NEW
2015295	The "Translate Selection" dialog needs a "Replace button"	NEW
2015300	[wpt-sync] Sync PR 57640 - Don't divide by zero on perfect matches	NEW
2015308	Modified codepen demo (https://codepen.io/robbobfrh84/pen/qBZJbYz?editors=0010) is much slower in Firefox	NEW
2015309	Modified codepen demo (https://codepen.io/shubniggurath/pen/RNaWvdm?editors=0010) is slower in Firefox	NEW
2015334	numerous memory management issues in macOS touchbar support	ASSIGNED
2015355	fillRect with createLinearGradient becomes much slower after many iterations	UNCONFIRMED
2015358	Battery API doesn't exist	UNCONFIRMED
2015414	[Gemini translation] I am using Firefox Android Beta, and it shows that I am logged in; however, the app crashes when I click "Sign Out."	UNCONFIRMED
2015513	Include a performance tests for ml security layer allow path	ASSIGNED
2015602	Significant performance issue with complex SVG at blowfish.page	UNCONFIRMED
2015693	Update WebGPU CTS to new version eb9091d141e126fd9479a62aeceb927b73b6af47 from 2026-02-06 06:03:53	ASSIGNED
2015700	Neither about:translations's source text area nor target language selector focused on page load	NEW
2015727	Quick action for Translate appears even for words that don’t match exactly	NEW
2015734	Translation boxes are not responsive and stack vertically when the window height is reduced	NEW
2015794	The l-beam cursor should not be displayed in the translation box	NEW
2015796	Ensure reference target observers are removed from labeled descendants of nearest ancestor label in nsLabeledNodeList	UNCONFIRMED
2015839	100% CPU usage when playing youtube video, all cores used - windows 11	UNCONFIRMED
2015887	llama.cpp leaks ~500mb for each link preview performed until threads are exhausted	NEW
2015935	Adding Adaptive Performance Prefs to Nimbus Manifest	ASSIGNED
2015955	Large event jank from synchronous decoding of images in Kotlin-wasm application	NEW
2016129	[Linux] NTP scrolls up and down fast with productivity widgets enabled and lower vertical view for Firefox window	NEW
2016239	Memory leak: Compose SharedElement animation retains destroyed HomeActivity and HomeFragment via InputMethodManager → Recomposer → snapshotInvalidations	NEW
2016281	Finish responsiveness work on sidebar	NEW
2016317	Browser Privacy strict mode slower my firefox and cause some little freeze when open background tabs	NEW
2016500	translation is overwritten with original content when changing text size in accessibility settings	NEW
2016538	The scroll bar should appear in about:translations for very large texts	NEW
2016551	smartbar memory toggle should be conditionally shown	NEW
2016559	[wpt-sync] Sync PR 57759 - Improve performance of `margin-collapse-through-for-various-height-values.tentative.html`	NEW
2016768	Error message from WebGPU on 32-bit Windows implicates dxcompiler	NEW
2016802	Slack has two overlapping scrollbars: one is a dark gray rectangle, the other is light gray with rounded ends	NEW
2016822	about:memory hangs due to the string hasher	NEW
2016881	nsCocoaWindow.mm: Defensive memory management and a leak fix	ASSIGNED
2016889	nsDragService.mm: memory management improvements	ASSIGNED
2016891	GPUAdapter and GPUDevice Return Different Values than Chrome	UNCONFIRMED

59 Total; 59 Open (100%); 0 Resolved (0%); 0 Verified (0%);