-{"bugs":[{"status":"ASSIGNED","id":1852924,"creation_time":"2023-09-13T10:36:04Z","op_sys":"Unspecified","component":"Networking: HTTP","severity":"S2","keywords":["leave-open","perf:responsiveness","reproducible","top50","webcompat:platform-bug"],"last_change_time":"2025-09-22T17:43:02Z","priority":"P1","summary":"H3 upload Speed still slow. Three times slower than other browsers."},{"id":1963814,"status":"ASSIGNED","summary":"Browser UI hang in sqlite3PagerSharedLock during LoginManagerCrypto decryption (via sqlite usage during NSC_DecryptInit for SDR crypto)","priority":"--","severity":"--","last_change_time":"2025-07-03T16:42:57Z","keywords":[],"component":"Password Manager","op_sys":"All","creation_time":"2025-05-01T13:52:50Z"},{"status":"NEW","id":1602842,"creation_time":"2019-12-10T17:22:25Z","op_sys":"Unspecified","component":"Widget: Cocoa","keywords":["perf:responsiveness"],"last_change_time":"2025-07-01T19:28:26Z","severity":"S3","priority":"P3","summary":"OSXDisplay::EnableVsync hangs in CVDisplayLinkCreateWithActiveCGDisplays"},{"severity":"S3","keywords":["perf:responsiveness"],"last_change_time":"2025-05-28T19:20:30Z","priority":"--","summary":"SendReceiveMouseInputEvent often blocks the main thread of the parent process","creation_time":"2020-11-16T15:30:13Z","op_sys":"Unspecified","component":"Panning and Zooming","id":1677509,"status":"NEW"},{"creation_time":"2021-01-26T19:14:50Z","op_sys":"Windows","component":"Layout: Text and Fonts","keywords":["perf:responsiveness"],"severity":"S3","last_change_time":"2025-08-22T20:22:21Z","priority":"--","summary":"Lazy font loading can still hang the main thread on Windows","status":"NEW","id":1688951},{"id":1689392,"status":"NEW","priority":"--","last_change_time":"2025-03-11T08:41:57Z","severity":"--","keywords":["meta"],"summary":"[Meta] investigate performance issues on Reddit.","creation_time":"2021-01-28T16:03:57Z","component":"Performance: General","op_sys":"Unspecified"},{"last_change_time":"2025-11-26T06:43:39Z","keywords":["perf:resource-use","reproducible"],"severity":"S3","priority":"P2","summary":"AudioContext power optimizations","creation_time":"2022-05-25T16:56:04Z","op_sys":"Unspecified","component":"Web Audio","id":1771179,"status":"NEW"},{"status":"NEW","id":1788530,"component":"Performance","op_sys":"Unspecified","creation_time":"2022-08-31T21:19:22Z","summary":"Fenix hangs and memory usage jumps on theguardian.com when opening headlines in new tab","priority":"P2","last_change_time":"2025-03-10T23:42:15Z","severity":"S2","keywords":["perf:resource-use","perf:responsiveness","reproducible"]},{"status":"NEW","id":1826576,"creation_time":"2023-04-05T14:45:37Z","op_sys":"Android","component":"Graphics: WebRender","last_change_time":"2025-10-30T20:58:10Z","keywords":["webcompat:platform-bug"],"severity":"S3","priority":"--","summary":"CSS filter() with invert() and hue-rotate() results in sluggish scrolling on Wikipedia"},{"status":"NEW","id":1849393,"keywords":["perf","perf:responsiveness"],"last_change_time":"2025-10-13T08:56:16Z","severity":"S3","priority":"P3","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","creation_time":"2023-08-18T17:52:57Z","op_sys":"Unspecified","component":"Session Restore"},{"id":1903530,"status":"NEW","priority":"P2","keywords":[],"severity":"S2","last_change_time":"2025-11-05T15:23:53Z","summary":"Frequent long janks on Android on loading certain pages","creation_time":"2024-06-19T11:50:31Z","component":"Storage: Quota Manager","op_sys":"Unspecified"},{"summary":"vizzy.io - The browser is slowed down and eventually stops responding","severity":"S2","keywords":["webcompat:needs-contact","webcompat:site-report"],"last_change_time":"2025-03-20T03:11:36Z","priority":"P2","op_sys":"Windows 10","component":"Site Reports","creation_time":"2024-11-04T09:34:27Z","status":"NEW","id":1928948},{"summary":"ChatGPT on clean Firefox install - \"This page is slowing down Firefox.\"","priority":"P1","severity":"S2","last_change_time":"2025-11-30T05:45:09Z","keywords":[],"component":"JavaScript Engine","op_sys":"Unspecified","creation_time":"2025-04-30T12:23:32Z","status":"NEW","id":1963578},{"status":"NEW","id":1971873,"summary":"m.facebook.com live site loads 100-200ms slower in Fenix than Chrome","priority":"P3","keywords":["perf:pageload"],"last_change_time":"2025-07-04T18:23:19Z","severity":"S3","component":"Performance: Navigation","op_sys":"Android","creation_time":"2025-06-12T19:54:27Z"},{"creation_time":"2025-10-22T15:48:12Z","op_sys":"Unspecified","component":"Performance Engineering","keywords":[],"severity":"S2","last_change_time":"2025-11-19T22:29:16Z","priority":"P3","summary":"Fenix cold start applink navigation performance ~1500ms slower than warm, hot scenarios, p75","status":"NEW","id":1995805},{"status":"REOPENED","id":1550754,"creation_time":"2019-05-10T14:52:25Z","component":"Crash Reporting","op_sys":"Unspecified","priority":"--","severity":"S3","keywords":["perf:responsiveness","perf:startup","reproducible"],"last_change_time":"2025-07-01T14:09:09Z","summary":"ContentParent::KillHard janks the main thread"}]}
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