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{"bugs":[{"summary":"Stop looking up GLContext symbols for every new window","keywords":["perf"],"op_sys":"Unspecified","status":"ASSIGNED","last_change_time":"2025-04-24T15:29:17Z","creation_time":"2017-02-22T23:15:05Z","severity":"S3","id":1341913,"priority":"P3","component":"Graphics"},{"component":"Performance: Navigation","creation_time":"2019-01-23T21:52:44Z","severity":"S3","priority":"P1","id":1522282,"last_change_time":"2025-03-21T02:42:31Z","keywords":["perf:pageload"],"summary":"Delayed image loading on low end ARM devices","status":"ASSIGNED","op_sys":"Android"},{"status":"ASSIGNED","op_sys":"Unspecified","summary":"Investigate merging shader cache files","keywords":["perf:startup"],"last_change_time":"2022-10-12T00:08:45Z","priority":"P3","id":1631949,"severity":"S3","creation_time":"2020-04-21T20:52:29Z","component":"Graphics"},{"creation_time":"2026-01-05T20:54:42Z","severity":"S2","priority":"--","id":2008619,"component":"Graphics: Text","keywords":["meta"],"summary":"[meta] Text shaping word cache affects performance on several SP3 tests (particularly TipTap)","status":"ASSIGNED","op_sys":"Unspecified","last_change_time":"2026-07-21T18:25:48Z"},{"status":"NEW","op_sys":"Windows Vista","keywords":["blocked-ux","perf"],"summary":"Poor performance using bookmarks menu with large amounts of bookmarks.","last_change_time":"2023-05-16T02:23:47Z","priority":"P3","id":486378,"creation_time":"2009-04-01T20:00:41Z","severity":"S3","component":"Bookmarks & History"},{"last_change_time":"2025-03-11T07:58:22Z","keywords":["main-thread-io","meta","perf","perf:frontend","perf:responsiveness"],"summary":"[meta] Implement an Asynchronous API for opening container query nodes","status":"NEW","op_sys":"All","component":"Places","creation_time":"2009-04-29T22:35:30Z","severity":"N/A","priority":"P3","id":490714},{"component":"Layout: Columns","creation_time":"2010-06-29T14:36:04Z","severity":"S3","priority":"--","id":575614,"last_change_time":"2022-10-10T22:59:55Z","keywords":["perf","perf:responsiveness","testcase"],"summary":"{inc} Resizing window is slow for long list with multicol (from \"-moz-column-count: 3\" or \"column-width: 20em;\")","status":"NEW","op_sys":"All"},{"creation_time":"2010-11-19T15:34:28Z","severity":"S3","priority":"--","id":613498,"component":"XPConnect","summary":"Very slow chrome to content DOM access","keywords":["perf","perf:pageload"],"status":"NEW","op_sys":"macOS","last_change_time":"2025-03-11T08:46:07Z"},{"last_change_time":"2022-10-10T23:24:13Z","keywords":["perf","perf:resource-use"],"summary":"throttle animation in completely obscured windows (virtual desktop, minimised, hidden behind other fullscreened windows)","op_sys":"Linux","status":"NEW","component":"Widget","severity":"S3","creation_time":"2011-03-31T18:37:55Z","id":646937,"priority":"P3"},{"last_change_time":"2025-09-29T14:01:38Z","op_sys":"All","status":"NEW","keywords":["perf","perf:responsiveness"],"summary":"Repeated calls to location.hash = \"#foo\" cause large amounts of disk activity","component":"Places","id":661590,"priority":"P3","severity":"S3","creation_time":"2011-06-02T18:09:59Z"},{"component":"Graphics: WebRender","creation_time":"2011-12-19T09:05:20Z","severity":"S3","id":711924,"priority":"--","last_change_time":"2024-04-08T16:58:41Z","keywords":["perf","perf:resource-use"],"summary":"Compositing/present still hapens when the only changing parts are out of the viewport","op_sys":"All","status":"NEW"},{"last_change_time":"2024-04-05T11:37:58Z","summary":"IE10 Test Drive: ParticleAcceleration Canvas 2D demo is slow","keywords":["perf"],"op_sys":"All","status":"NEW","component":"Graphics: Canvas2D","severity":"S3","creation_time":"2012-06-03T03:18:54Z","id":760888,"priority":"--"},{"last_change_time":"2023-06-05T16:31:57Z","status":"NEW","op_sys":"All","keywords":["perf:resource-use"],"summary":"We appear to be copying large data URIs over and over in nsSimpleURI.","component":"Networking","priority":"P3","id":803709,"severity":"S3","creation_time":"2012-10-19T21:25:22Z"},{"status":"NEW","op_sys":"Linux","keywords":["perf:responsiveness"],"summary":"Processing http://lib.tkk.fi/Dipl/2002/urn007413.pdf is slow, and its text layer is all messed up","last_change_time":"2025-03-31T14:05:54Z","priority":"P3","id":810214,"severity":"S3","creation_time":"2012-11-09T08:29:30Z","component":"PDF Viewer"},{"keywords":["perf","perf:responsiveness"],"summary":"janky Scrolling on smartsheet.com Sheets","status":"NEW","op_sys":"Windows 7","last_change_time":"2023-03-01T12:04:23Z","severity":"S3","creation_time":"2012-12-14T13:46:12Z","priority":"--","id":821693,"component":"CSS Parsing and Computation"},{"last_change_time":"2022-11-24T06:34:31Z","keywords":["perf"],"summary":"nsIconChannel::AsyncOpen can block","status":"NEW","op_sys":"Windows 7","component":"Graphics: ImageLib","creation_time":"2013-01-07T19:06:03Z","severity":"S3","priority":"--","id":827440},{"op_sys":"Windows 8","status":"NEW","keywords":["perf"],"summary":"Opening huge mercurial long commit page freezing Firefox","last_change_time":"2022-10-29T12:12:42Z","id":827937,"priority":"--","creation_time":"2013-01-08T19:17:33Z","severity":"S3","component":"Layout"},{"status":"NEW","op_sys":"All","summary":"Firefox should abort on tryserver when executing SQL on the main thread","keywords":["perf:frontend","perf:responsiveness"],"last_change_time":"2024-08-20T19:28:43Z","priority":"P3","id":830504,"creation_time":"2013-01-14T22:07:19Z","severity":"S3","component":"SQLite and Embedded Database Bindings"},{"id":837989,"priority":"--","creation_time":"2013-02-05T02:16:08Z","severity":"S3","component":"General","op_sys":"All","status":"NEW","keywords":["main-thread-io","perf:frontend"],"summary":"Use IOUtils for gLastOpenDirectory","last_change_time":"2023-05-16T02:22:53Z"},{"id":862383,"priority":"P3","severity":"S3","creation_time":"2013-04-16T15:29:21Z","component":"Networking: File","op_sys":"macOS","status":"NEW","summary":"nsFileChannel::nsFileChannel causes expensive lstats","keywords":["main-thread-io","perf:responsiveness"],"last_change_time":"2024-03-27T16:10:09Z"},{"priority":"P3","id":890712,"creation_time":"2013-07-07T15:57:11Z","severity":"S3","component":"Networking","status":"NEW","op_sys":"All","keywords":["main-thread-io","perf","perf:frontend"],"summary":"nsIOService::NewFileURI is doing main thread IO and causes jank","last_change_time":"2024-04-01T16:26:36Z"},{"keywords":["perf"],"summary":"Polygon.com page scrolling becomes extremely slow after a while","status":"NEW","op_sys":"All","last_change_time":"2023-07-27T07:06:57Z","severity":"S3","creation_time":"2013-09-10T12:49:00Z","priority":"--","id":914595,"component":"Layout"},{"last_change_time":"2022-10-11T01:07:35Z","op_sys":"All","status":"NEW","keywords":["perf:resource-use"],"summary":"Visibility state is not updated when the browser window is obscured or on another workspace","component":"General","id":917090,"priority":"--","severity":"S3","creation_time":"2013-09-17T02:34:03Z"},{"op_sys":"Linux","status":"NEW","summary":"Optimize GetRootPresContext() to avoid going through the viewmanager / view tree","keywords":["perf"],"last_change_time":"2025-12-02T04:57:52Z","id":984690,"priority":"--","creation_time":"2014-03-18T00:14:52Z","severity":"S3","component":"Layout"},{"severity":"S3","creation_time":"2014-06-10T10:02:00Z","priority":"--","id":1023152,"component":"Toolbars and Customization","summary":"Preload panel contents on hover of toolbar button","keywords":["perf:frontend"],"status":"NEW","op_sys":"All","last_change_time":"2023-07-19T04:52:40Z"},{"last_change_time":"2026-05-29T15:38:01Z","summary":"Make bookmarks toolbar view use async openContainer","keywords":["perf:frontend"],"status":"NEW","op_sys":"All","component":"Places","severity":"S3","creation_time":"2014-08-02T09:50:40Z","priority":"P3","id":1047817},{"component":"JavaScript Engine","creation_time":"2014-11-12T00:22:19Z","severity":"S3","id":1097376,"priority":"--","last_change_time":"2022-10-11T15:57:30Z","keywords":["perf"],"summary":"Poor performance in Ember app Discourse","op_sys":"Android","status":"NEW"},{"component":"Layout: Form Controls","severity":"S3","creation_time":"2015-01-06T01:55:10Z","priority":"P5","id":1118086,"last_change_time":"2025-12-05T02:06:49Z","keywords":["multiprocess","perf","perf:responsiveness","testcase"],"summary":"[e10s] There is a delay for about 1 seconds to display <select> drop-down list with 1600+ 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CanvasWebGL","keywords":["perf","regression","testcase"],"summary":"Low performance of texImage2D with canvas2d and WebGL","op_sys":"Unspecified","status":"NEW","last_change_time":"2025-04-05T10:12:20Z"},{"op_sys":"Unspecified","status":"NEW","keywords":["perf:responsiveness","reproducible"],"summary":"Firefox hangs with 100% CPU usage when scrolling on specific page","last_change_time":"2025-03-17T20:05:29Z","id":1257910,"priority":"--","severity":"S3","creation_time":"2016-03-18T17:34:07Z","component":"Graphics: WebRender"},{"last_change_time":"2022-10-11T18:13:31Z","summary":"Running jasmine is slower than Safari and Chrome","keywords":["perf"],"status":"NEW","op_sys":"Unspecified","component":"JavaScript Engine","severity":"S3","creation_time":"2016-04-20T07:12:37Z","priority":"--","id":1265980},{"creation_time":"2016-06-07T13:45:20Z","severity":"S3","id":1278554,"priority":"--","component":"Graphics: Canvas2D","summary":"CanvasRenderingContext2D::DrawImage takes lots of time when scrolling Google Spreadsheet","keywords":["perf"],"op_sys":"Unspecified","status":"NEW","last_change_time":"2022-11-08T00:01:53Z"},{"component":"JavaScript: GC","id":1280802,"priority":"P3","severity":"S3","creation_time":"2016-06-19T13:43:03Z","last_change_time":"2024-08-11T09:37:57Z","op_sys":"Unspecified","status":"NEW","keywords":["perf"],"summary":"Angular framework performance test spends 10% in nursery GC"},{"component":"Graphics","severity":"S3","creation_time":"2016-06-29T13:06:59Z","id":1283089,"priority":"P3","last_change_time":"2022-12-08T15:45:06Z","summary":"Firefox 40+ are very sluggish through x2go","keywords":["perf:responsiveness","regression"],"op_sys":"Linux","status":"NEW"},{"severity":"S3","creation_time":"2016-08-12T05:51:58Z","id":1294625,"priority":"P3","component":"Layout","summary":"Try to tick refresh driver during html parsing","keywords":["perf"],"op_sys":"Unspecified","status":"NEW","last_change_time":"2026-06-10T12:53:35Z"},{"creation_time":"2016-08-18T03:04:45Z","severity":"S3","id":1296161,"priority":"P3","component":"Layout","keywords":["perf"],"summary":"Measure and solve sync reflow for studying gdoc performance.","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T18:31:41Z"},{"op_sys":"Windows 7","status":"NEW","keywords":["perf"],"summary":"If you set a high Polling Rate USB port of the mouse (1000 Hz), there will be noticeable performance issues while moving tabs","last_change_time":"2026-02-17T17:22:57Z","id":1306925,"priority":"--","severity":"S3","creation_time":"2016-10-01T23:51:50Z","component":"Widget: Win32"},{"component":"General","priority":"--","id":1307024,"creation_time":"2016-10-03T03:00:35Z","severity":"S3","last_change_time":"2024-08-14T04:57:13Z","status":"NEW","op_sys":"Linux","keywords":["perf"],"summary":"[Perf] [google docs] Firefox will get 3~9% faster when running gdoc test cases with chrome user agent"},{"creation_time":"2016-10-08T00:18:22Z","severity":"--","priority":"--","id":1308660,"component":"Layout","keywords":["perf","perf:responsiveness"],"summary":"for background tabs, break refresh driver tick into multiple events off the main thread's event loop","status":"NEW","op_sys":"Unspecified","last_change_time":"2025-04-16T19:29:34Z"},{"last_change_time":"2022-10-11T18:44:06Z","op_sys":"Windows 10","status":"NEW","keywords":["perf"],"summary":"Google Apps extremely slow -- scrolling, updating text, etc -- unusable","component":"JavaScript Engine","id":1316864,"priority":"P5","creation_time":"2016-11-11T14:41:11Z","severity":"S3"},{"keywords":["hang","meta","nightly-community","perf:frontend"],"summary":"[meta] Speed and performance of importing bookmarks from JSON or HTML files is 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observers","keywords":["perf"],"last_change_time":"2022-10-11T19:08:21Z","id":1350749,"priority":"--","severity":"S3","creation_time":"2017-03-26T21:54:08Z","component":"General"},{"last_change_time":"2025-03-11T08:37:03Z","summary":"Provide \"Slight/Light/Low power/Battery saving/Battery saver\" mode option","keywords":["nightly-community","perf","perf:resource-use","power"],"status":"NEW","op_sys":"All","component":"Performance: General","severity":"--","creation_time":"2017-03-29T17:44:37Z","priority":"--","id":1351755},{"creation_time":"2017-03-29T18:30:44Z","severity":"S3","id":1351789,"priority":"P3","component":"JavaScript: GC","summary":"Add Telemetry probes for measuring garbage volume per GC","keywords":["perf"],"op_sys":"Unspecified","status":"NEW","last_change_time":"2025-04-27T11:43:06Z"},{"last_change_time":"2022-10-11T19:09:06Z","summary":"Consider faster alternatives to PLDHashTable in hot Layout code 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GC"},{"last_change_time":"2025-02-10T18:11:27Z","op_sys":"All","status":"NEW","summary":"Optimize GetName TypeOfNoProperty","keywords":["perf"],"component":"JavaScript Engine: JIT","id":1353384,"priority":"P3","creation_time":"2017-04-04T14:54:51Z","severity":"S3"},{"creation_time":"2017-04-09T22:09:43Z","severity":"S3","id":1354945,"priority":"P3","component":"XPConnect","keywords":["perf"],"summary":"Initialize sandbox global properties lazily","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T19:11:14Z"},{"id":1355456,"priority":"P3","severity":"S3","creation_time":"2017-04-11T13:02:53Z","component":"Tabbed Browser","op_sys":"Unspecified","status":"NEW","summary":"Investigate preparing the next tab on mousedown on the tab close button","keywords":["perf","perf:frontend","perf:responsiveness"],"last_change_time":"2023-07-19T04:59:14Z"},{"keywords":["perf:frontend"],"summary":"The last window and the task bar item should disappear immediately on 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