Bug: Intermittent unknown test url | uncaught exception - NS_NOINTERFACE: Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIObserverService.addObserver] at construct@chrome://global/content/elements/browser-custom-element.js:1034:24
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2023-07-08 05:13:50+00:00
Resolved: 2023-08-07 12:03:32+00:00

**Filed by:** smolnar [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=421960333&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/MuMB53g9Ry6S78kHkEvX2w/runs/0/artifacts/public/logs/live_backing.log

---
```
TEST-OK | toolkit/components/normandy/test/browser/browser_actions_AddonRollbackAction.js | took 371ms
[task 2023-07-08T04:35:38.212Z] 04:35:38    ERROR - GECKO(7624) | TEST-UNEXPECTED-FAIL | unknown test url | uncaught exception - NS_NOINTERFACE: Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIObserverService.addObserver] at construct@chrome://global/content/elements/browser-custom-element.js:1034:24
[task 2023-07-08T04:35:38.212Z] 04:35:38     INFO - GECKO(7624) | connectedCallback@chrome://global/content/elements/browser-custom-element.js:330:12
[task 2023-07-08T04:35:38.213Z] 04:35:38     INFO - GECKO(7624) | _insertBrowser@chrome://browser/content/tabbrowser.js:2380:24
[task 2023-07-08T04:35:38.213Z] 04:35:38     INFO - GECKO(7624) | addTab@chrome://browser/content/tabbrowser.js:2780:16
[task 2023-07-08T04:35:38.213Z] 04:35:38     INFO - GECKO(7624) | Tester_waitForWindowsState@chrome://mochikit/content/browser-test.js:460:16
[task 2023-07-08T04:35:38.214Z] 04:35:38     INFO - GECKO(7624) | nextTest@chrome://mochikit/content/browser-test.js:1007:10
[task 2023-07-08T04:35:38.214Z] 04:35:38     INFO - GECKO(7624) | async*testScope/test_finish/<@chrome://mochikit/content/browser-test.js:1794:25
[task 2023-07-08T04:35:38.215Z] 04:35:38     INFO - GECKO(7624) | run@chrome://mochikit/content/browser-test.js:1714:9
[task 2023-07-08T04:35:38.216Z] 04:35:38     INFO - GECKO(7624) | JavaScript error: chrome://global/content/elements/browser-custom-element.js, line 1034: NS_NOINTERFACE: Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIObserverService.addObserver]
[task 2023-07-08T04:35:38.219Z] 04:35:38     INFO - checking window state
[task 2023-07-08T04:35:38.229Z] 04:35:38     INFO - Console message: [JavaScript Error: "NS_NOINTERFACE: Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIObserverService.addObserver]" {file: "chrome://global/content/elements/browser-custom-element.js" line: 1034}]
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - construct@chrome://global/content/elements/browser-custom-element.js:1034:24
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - connectedCallback@chrome://global/content/elements/browser-custom-element.js:330:12
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - _insertBrowser@chrome://browser/content/tabbrowser.js:2380:24
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - addTab@chrome://browser/content/tabbrowser.js:2780:16
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - Tester_waitForWindowsState@chrome://mochikit/content/browser-test.js:460:16
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - nextTest@chrome://mochikit/content/browser-test.js:1007:10
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - async*testScope/test_finish/<@chrome://mochikit/content/browser-test.js:1794:25
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - run@chrome://mochikit/content/browser-test.js:1714:9
[task 2023-07-08T04:35:38.230Z] 04:35:38     INFO - 
[task 2023-07-08T04:35:38.235Z] 04:35:38     INFO - TEST-START | toolkit/components/normandy/test/browser/browser_actions_AddonRolloutAction.js
```