-{"bugs":[{"severity":"S2","status":"ASSIGNED","op_sys":"Unspecified","id":1852924,"keywords":["leave-open","perf:responsiveness","reproducible","top50","webcompat:platform-bug"],"priority":"P1","last_change_time":"2025-09-22T17:43:02Z","creation_time":"2023-09-13T10:36:04Z","summary":"H3 upload Speed still slow. Three times slower than other browsers.","component":"Networking: HTTP"},{"id":1963814,"op_sys":"All","status":"ASSIGNED","severity":"--","component":"Password Manager","summary":"Browser UI hang in sqlite3PagerSharedLock during LoginManagerCrypto decryption (via sqlite usage during NSC_DecryptInit for SDR crypto)","creation_time":"2025-05-01T13:52:50Z","priority":"--","last_change_time":"2025-07-03T16:42:57Z","keywords":[]},{"keywords":["perf:responsiveness"],"priority":"P3","last_change_time":"2025-07-01T19:28:26Z","creation_time":"2019-12-10T17:22:25Z","component":"Widget: Cocoa","summary":"OSXDisplay::EnableVsync hangs in CVDisplayLinkCreateWithActiveCGDisplays","status":"NEW","severity":"S3","op_sys":"Unspecified","id":1602842},{"keywords":["perf:responsiveness"],"priority":"--","last_change_time":"2025-05-28T19:20:30Z","creation_time":"2020-11-16T15:30:13Z","component":"Panning and Zooming","summary":"SendReceiveMouseInputEvent often blocks the main thread of the parent process","status":"NEW","severity":"S3","op_sys":"Unspecified","id":1677509},{"op_sys":"Windows","status":"NEW","severity":"S3","id":1688951,"keywords":["perf:responsiveness"],"priority":"--","last_change_time":"2025-08-22T20:22:21Z","summary":"Lazy font loading can still hang the main thread on Windows","component":"Layout: Text and Fonts","creation_time":"2021-01-26T19:14:50Z"},{"keywords":["meta"],"last_change_time":"2025-03-11T08:41:57Z","priority":"--","summary":"[Meta] investigate performance issues on Reddit.","component":"Performance: General","creation_time":"2021-01-28T16:03:57Z","op_sys":"Unspecified","status":"NEW","severity":"--","id":1689392},{"op_sys":"Unspecified","status":"NEW","severity":"S3","id":1771179,"keywords":["perf:resource-use","reproducible"],"priority":"P2","last_change_time":"2025-09-17T01:08:29Z","component":"Web Audio","summary":"AudioContext power optimizations","creation_time":"2022-05-25T16:56:04Z"},{"op_sys":"Unspecified","severity":"S2","status":"NEW","id":1788530,"keywords":["perf:resource-use","perf:responsiveness","reproducible"],"last_change_time":"2025-03-10T23:42:15Z","priority":"P2","component":"Performance","summary":"Fenix hangs and memory usage jumps on theguardian.com when opening headlines in new tab","creation_time":"2022-08-31T21:19:22Z"},{"op_sys":"Android","status":"NEW","severity":"S3","id":1826576,"priority":"--","last_change_time":"2025-10-30T20:58:10Z","keywords":["webcompat:platform-bug"],"summary":"CSS filter() with invert() and hue-rotate() results in sluggish scrolling on Wikipedia","component":"Graphics: WebRender","creation_time":"2023-04-05T14:45:37Z"},{"id":1849393,"op_sys":"Unspecified","status":"NEW","severity":"S3","summary":"Firefox regularly hangs for over half a second in SessionWriter.sys.mjs calling IOUtils.writeJSON serializing a massive JS object when saving tab state","component":"Session Restore","creation_time":"2023-08-18T17:52:57Z","priority":"P3","last_change_time":"2025-10-13T08:56:16Z","keywords":["perf","perf:responsiveness"]},{"keywords":[],"priority":"P2","last_change_time":"2025-11-05T15:23:53Z","creation_time":"2024-06-19T11:50:31Z","component":"Storage: Quota Manager","summary":"Frequent long janks on Android on loading certain pages","severity":"S2","status":"NEW","op_sys":"Unspecified","id":1903530},{"severity":"S2","status":"NEW","op_sys":"Windows 10","id":1928948,"last_change_time":"2025-03-20T03:11:36Z","priority":"P2","keywords":["webcompat:needs-contact","webcompat:site-report"],"creation_time":"2024-11-04T09:34:27Z","component":"Site Reports","summary":"vizzy.io - The browser is slowed down and eventually stops responding"},{"severity":"S2","status":"NEW","op_sys":"Unspecified","id":1963578,"last_change_time":"2025-11-11T17:40:36Z","priority":"P1","keywords":[],"creation_time":"2025-04-30T12:23:32Z","summary":"ChatGPT on clean Firefox install - \"This page is slowing down Firefox.\"","component":"JavaScript Engine"},{"id":1971873,"severity":"S3","status":"NEW","op_sys":"Android","creation_time":"2025-06-12T19:54:27Z","component":"Performance: Navigation","summary":"m.facebook.com live site loads 100-200ms slower in Fenix than Chrome","keywords":["perf:pageload"],"priority":"P3","last_change_time":"2025-07-04T18:23:19Z"},{"id":1995805,"op_sys":"Unspecified","status":"NEW","severity":"S2","component":"Performance Engineering","summary":"Fenix cold start applink navigation performance ~1500ms slower than warm, hot scenarios, p75","creation_time":"2025-10-22T15:48:12Z","keywords":[],"last_change_time":"2025-11-07T06:59:32Z","priority":"P3"},{"last_change_time":"2025-07-01T14:09:09Z","priority":"--","keywords":["perf:responsiveness","perf:startup","reproducible"],"summary":"ContentParent::KillHard janks the main thread","component":"Crash Reporting","creation_time":"2019-05-10T14:52:25Z","op_sys":"Unspecified","severity":"S3","status":"REOPENED","id":1550754}]}
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