Bug: Intermittent unknown test url | uncaught exception - TypeError: Return value of LifecycleGetCustomInterfaceCallback is not an object. at _insertBrowser@chrome://browser/content/tabbrowser.js:2380:24
Status: RESOLVED
Priority: P5
Resolution: FIXED
Created: 2023-07-07 20:17:53+00:00
Resolved: 2023-07-17 06:12:38+00:00

**Filed by:** imoraru [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=421931921&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/JvpaccAIRgKNRCyvwCTAgw/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2023-07-07T19:42:40.351Z] 19:42:40     INFO - TEST-OK | dom/ipc/tests/browser_wpi_isolate_everything.js | took 41801ms
[task 2023-07-07T19:42:40.366Z] 19:42:40    ERROR - GECKO(1593) | TEST-UNEXPECTED-FAIL | unknown test url | uncaught exception - TypeError: Return value of LifecycleGetCustomInterfaceCallback is not an object. at _insertBrowser@chrome://browser/content/tabbrowser.js:2380:24
[task 2023-07-07T19:42:40.367Z] 19:42:40     INFO - GECKO(1593) | addTab@chrome://browser/content/tabbrowser.js:2780:16
[task 2023-07-07T19:42:40.368Z] 19:42:40     INFO - GECKO(1593) | Tester_waitForWindowsState@chrome://mochikit/content/browser-test.js:460:16
[task 2023-07-07T19:42:40.369Z] 19:42:40     INFO - GECKO(1593) | nextTest@chrome://mochikit/content/browser-test.js:1007:10
[task 2023-07-07T19:42:40.369Z] 19:42:40     INFO - GECKO(1593) | async*testScope/test_finish/<@chrome://mochikit/content/browser-test.js:1794:25
[task 2023-07-07T19:42:40.370Z] 19:42:40     INFO - GECKO(1593) | run@chrome://mochikit/content/browser-test.js:1714:9
[task 2023-07-07T19:42:40.371Z] 19:42:40     INFO - GECKO(1593) | JavaScript error: chrome://browser/content/tabbrowser.js, line 2380: TypeError: Return value of LifecycleGetCustomInterfaceCallback is not an object.
[task 2023-07-07T19:42:40.386Z] 19:42:40    ERROR - GECKO(1593) | TEST-UNEXPECTED-FAIL | unknown test url | uncaught exception - TypeError: Return value of LifecycleGetCustomInterfaceCallback is not an object. at _insertBrowser@chrome://browser/content/tabbrowser.js:2380:24
[task 2023-07-07T19:42:40.386Z] 19:42:40     INFO - GECKO(1593) | addTab@chrome://browser/content/tabbrowser.js:2780:16
[task 2023-07-07T19:42:40.386Z] 19:42:40     INFO - GECKO(1593) | Tester_waitForWindowsState@chrome://mochikit/content/browser-test.js:460:16
[task 2023-07-07T19:42:40.386Z] 19:42:40     INFO - GECKO(1593) | nextTest@chrome://mochikit/content/browser-test.js:1007:10
[task 2023-07-07T19:42:40.386Z] 19:42:40     INFO - GECKO(1593) | async*testScope/test_finish/<@chrome://mochikit/content/browser-test.js:1794:25
[task 2023-07-07T19:42:40.386Z] 19:42:40     INFO - GECKO(1593) | run@chrome://mochikit/content/browser-test.js:1714:9
[task 2023-07-07T19:42:40.388Z] 19:42:40     INFO - GECKO(1593) | JavaScript error: chrome://browser/content/tabbrowser.js, line 2380: TypeError: Return value of LifecycleGetCustomInterfaceCallback is not an object.
[task 2023-07-07T19:42:40.452Z] 19:42:40     INFO - checking window state
[task 2023-07-07T19:42:40.474Z] 19:42:40     INFO - Console message: [JavaScript Error: "TypeError: Return value of LifecycleGetCustomInterfaceCallback is not an object." {file: "chrome://browser/content/tabbrowser.js" line: 2380}]
[task 2023-07-07T19:42:40.474Z] 19:42:40     INFO - _insertBrowser@chrome://browser/content/tabbrowser.js:2380:24
[task 2023-07-07T19:42:40.474Z] 19:42:40     INFO - addTab@chrome://browser/content/tabbrowser.js:2780:16
[task 2023-07-07T19:42:40.477Z] 19:42:40     INFO - Tester_waitForWindowsState@chrome://mochikit/content/browser-test.js:460:16
[task 2023-07-07T19:42:40.478Z] 19:42:40     INFO - nextTest@chrome://mochikit/content/browser-test.js:1007:10
[task 2023-07-07T19:42:40.479Z] 19:42:40     INFO - async*testScope/test_finish/<@chrome://mochikit/content/browser-test.js:1794:25
[task 2023-07-07T19:42:40.479Z] 19:42:40     INFO - run@chrome://mochikit/content/browser-test.js:1714:9
[task 2023-07-07T19:42:40.480Z] 19:42:40     INFO - 
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - Console message: [JavaScript Error: "TypeError: Return value of LifecycleGetCustomInterfaceCallback is not an object." {file: "chrome://browser/content/tabbrowser.js" line: 2380}]
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - _insertBrowser@chrome://browser/content/tabbrowser.js:2380:24
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - addTab@chrome://browser/content/tabbrowser.js:2780:16
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - Tester_waitForWindowsState@chrome://mochikit/content/browser-test.js:460:16
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - nextTest@chrome://mochikit/content/browser-test.js:1007:10
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - async*testScope/test_finish/<@chrome://mochikit/content/browser-test.js:1794:25
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - run@chrome://mochikit/content/browser-test.js:1714:9
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - 
[task 2023-07-07T19:42:40.482Z] 19:42:40     INFO - TEST-START | dom/ipc/tests/browser_wpi_isolate_high_value.js
```