-{"bugs":[{"op_sys":"Unspecified","severity":"S2","priority":"P1","keywords":["leave-open","perf:responsiveness","reproducible","top50","webcompat:platform-bug"],"id":1852924,"creation_time":"2023-09-13T10:36:04Z","component":"Networking: HTTP","status":"ASSIGNED","last_change_time":"2025-09-22T17:43:02Z","summary":"H3 upload Speed still slow. Three times slower than other browsers."},{"keywords":[],"id":1963814,"creation_time":"2025-05-01T13:52:50Z","severity":"--","op_sys":"All","priority":"--","summary":"Browser UI hang in sqlite3PagerSharedLock during LoginManagerCrypto decryption (via sqlite usage during NSC_DecryptInit for SDR crypto)","last_change_time":"2025-07-03T16:42:57Z","status":"ASSIGNED","component":"Password Manager"},{"component":"Widget: Cocoa","status":"NEW","last_change_time":"2025-07-01T19:28:26Z","summary":"OSXDisplay::EnableVsync hangs in CVDisplayLinkCreateWithActiveCGDisplays","severity":"S3","op_sys":"Unspecified","priority":"P3","id":1602842,"creation_time":"2019-12-10T17:22:25Z","keywords":["perf:responsiveness"]},{"component":"Panning and Zooming","status":"NEW","summary":"SendReceiveMouseInputEvent often blocks the main thread of the parent process","last_change_time":"2025-05-28T19:20:30Z","priority":"--","severity":"S3","op_sys":"Unspecified","id":1677509,"creation_time":"2020-11-16T15:30:13Z","keywords":["perf:responsiveness"]},{"status":"NEW","component":"Layout: Text and Fonts","summary":"Lazy font loading can still hang the main thread on Windows","last_change_time":"2025-08-22T20:22:21Z","priority":"--","severity":"S3","op_sys":"Windows","keywords":["perf:responsiveness"],"creation_time":"2021-01-26T19:14:50Z","id":1688951},{"creation_time":"2021-01-28T16:03:57Z","id":1689392,"keywords":["meta"],"op_sys":"Unspecified","priority":"--","severity":"--","last_change_time":"2025-03-11T08:41:57Z","summary":"[Meta] investigate performance issues on Reddit.","component":"Performance: General","status":"NEW"},{"severity":"S3","priority":"P2","op_sys":"Unspecified","id":1771179,"creation_time":"2022-05-25T16:56:04Z","keywords":["perf:resource-use","reproducible"],"status":"NEW","component":"Web Audio","last_change_time":"2025-11-26T06:43:39Z","summary":"AudioContext power optimizations"},{"severity":"S2","op_sys":"Unspecified","priority":"P2","keywords":["perf:resource-use","perf:responsiveness","reproducible"],"creation_time":"2022-08-31T21:19:22Z","id":1788530,"component":"Performance","status":"NEW","summary":"Fenix hangs and memory usage jumps on theguardian.com when opening headlines in new tab","last_change_time":"2025-03-10T23:42:15Z"},{"id":1826576,"creation_time":"2023-04-05T14:45:37Z","keywords":["webcompat:platform-bug"],"op_sys":"Android","priority":"--","severity":"S3","last_change_time":"2025-10-30T20:58:10Z","summary":"CSS filter() with invert() and hue-rotate() results in sluggish scrolling on Wikipedia","component":"Graphics: WebRender","status":"NEW"},{"keywords":["perf","perf:responsiveness"],"creation_time":"2023-08-18T17:52:57Z","id":1849393,"priority":"P3","severity":"S3","op_sys":"Unspecified","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","last_change_time":"2025-10-13T08:56:16Z","status":"NEW","component":"Session Restore"},{"component":"Storage: Quota Manager","status":"NEW","summary":"Frequent long janks on Android on loading certain pages","last_change_time":"2025-11-05T15:23:53Z","op_sys":"Unspecified","priority":"P2","severity":"S2","id":1903530,"creation_time":"2024-06-19T11:50:31Z","keywords":[]},{"keywords":["webcompat:needs-contact","webcompat:site-report"],"creation_time":"2024-11-04T09:34:27Z","id":1928948,"severity":"S2","priority":"P2","op_sys":"Windows 10","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"},{"priority":"P1","op_sys":"Unspecified","severity":"S2","creation_time":"2025-04-30T12:23:32Z","id":1963578,"keywords":[],"status":"NEW","component":"JavaScript Engine","summary":"ChatGPT on clean Firefox install - \"This page is slowing down Firefox.\"","last_change_time":"2025-11-21T22:45:42Z"},{"severity":"S3","op_sys":"Android","priority":"P3","creation_time":"2025-06-12T19:54:27Z","id":1971873,"keywords":["perf:pageload"],"component":"Performance: Navigation","status":"NEW","summary":"m.facebook.com live site loads 100-200ms slower in Fenix than Chrome","last_change_time":"2025-07-04T18:23:19Z"},{"creation_time":"2025-10-22T15:48:12Z","id":1995805,"keywords":[],"severity":"S2","priority":"P3","op_sys":"Unspecified","last_change_time":"2025-11-19T22:29:16Z","summary":"Fenix cold start applink navigation performance ~1500ms slower than warm, hot scenarios, p75","component":"Performance Engineering","status":"NEW"},{"status":"REOPENED","component":"Crash Reporting","summary":"ContentParent::KillHard janks the main thread","last_change_time":"2025-07-01T14:09:09Z","op_sys":"Unspecified","severity":"S3","priority":"--","keywords":["perf:responsiveness","perf:startup","reproducible"],"creation_time":"2019-05-10T14:52:25Z","id":1550754}]}
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