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