Bug: Permanent failure line (even for successful tasks) JavaScript error: resource://gre/modules/PrivateBrowsingUtils.jsm, line 54: TypeError: can't access property "docShell", aWindow is null
Status: RESOLVED
Priority: P5
Resolution: FIXED
Created: 2021-11-25 13:14:26+00:00
Resolved: 2021-11-29 06:31:07+00:00

**Filed by:** archaeopteryx [at] coole-files.de
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=359208115&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/XyeAOnAkT_-t1uGT2yKU-w/runs/0/artifacts/public/logs/live_backing.log

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```
Since bug 1725354 landed, may talos (= older performance test suite) tasks log these failures as errors. Treeherder's log parsing picks them up as errors which complicates the identification if the tasks actually fail. People might think this error message is causing the failure.

[task 2021-11-25T10:45:43.318Z] 10:45:43     INFO -  Installing Webextensions:
[task 2021-11-25T10:45:43.319Z] 10:45:43     INFO -  Application command: /home/cltbld/tasks/task_163782797333103/build/application/firefox/firefox http://127.0.0.1:46577/getInfo.html -profile /tmp/tmpvv8y299t/profile
[task 2021-11-25T10:45:43.321Z] 10:45:43     INFO -  TEST-INFO | started process 2991 (/home/cltbld/tasks/task_163782797333103/build/application/firefox/firefox http://127.0.0.1:46577/getInfo.html)
[task 2021-11-25T10:45:44.182Z] 10:45:44     INFO -  console.warn: SearchSettings: "get: No settings file exists, new profile?" (new NotFoundError("Could not open the file at /tmp/tmpvv8y299t/profile/search.json.mozlz4", (void 0)))
[task 2021-11-25T10:45:44.434Z] 10:45:44     INFO -  __metrics
[task 2021-11-25T10:45:44.434Z] 10:45:44     INFO -  	Screen width/height: 1600/1200
[task 2021-11-25T10:45:44.434Z] 10:45:44     INFO -  	colorDepth: 24
[task 2021-11-25T10:45:44.434Z] 10:45:44     INFO -  	Browser inner width/height: 1280/955
[task 2021-11-25T10:45:44.434Z] 10:45:44     INFO -  __metrics
[task 2021-11-25T10:45:44.526Z] 10:45:44     INFO -  JavaScript warning: resource://gre/modules/Troubleshoot.jsm, line 694: WebGL context was lost.
[task 2021-11-25T10:45:44.529Z] 10:45:44     INFO -  JavaScript warning: resource://gre/modules/Troubleshoot.jsm, line 694: WebGL context was lost.
[task 2021-11-25T10:45:44.595Z] 10:45:44     INFO -  about:support	{"application":{"name":"Firefox","osVersion":"Linux 4.15.0-162-generic #170-Ubuntu SMP Mon Oct 18 11:38:05 UTC 2021","version":"96.0a1","buildID":"20211123173009","distributionID":"","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:96.0) Gecko/20100101 Firefox/96.0","safeMode":false,"updateChannel":"nightly-autoland","supportURL":"https://support.mozilla.org/1/firefox/96.0a1/Linux/en-US/","osTheme":"Adwaita / 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[task 2021-11-25T10:45:45.339Z] 10:45:45    ERROR -  JavaScript error: resource://gre/modules/PrivateBrowsingUtils.jsm, line 54: TypeError: can't access property "docShell", aWindow is null
[task 2021-11-25T10:45:45.367Z] 10:45:45     INFO -  ###!!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost
[task 2021-11-25T10:45:45.388Z] 10:45:45     INFO -  TEST-INFO | 2991: exit 0
```