Bug: Intermittent browser/base/content/test/general/browser_bug734076.js | Uncaught exception - at chrome://mochitests/content/browser/browser/base/content/test/general/browser_bug734076.js:31 - TypeError: can't access property "document", content is
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2021-11-04 08:41:10+00:00
Resolved: 2022-06-14 17:06:31+00:00

**Filed by:** ccozmuta [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=356963280&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Rp6J9XD_T6qXxXrri6VrLw/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2021-11-04T08:10:48.411Z] 08:10:48     INFO - TEST-START | browser/base/content/test/general/browser_bug734076.js
[task 2021-11-04T08:10:48.811Z] 08:10:48     INFO - GECKO(1561) | -----------------------------------------------------
[task 2021-11-04T08:10:48.813Z] 08:10:48     INFO - GECKO(1561) | Suppressions used:
[task 2021-11-04T08:10:48.813Z] 08:10:48     INFO - GECKO(1561) |   count      bytes template
[task 2021-11-04T08:10:48.814Z] 08:10:48     INFO - GECKO(1561) |      13        416 nsComponentManagerImpl
[task 2021-11-04T08:10:48.815Z] 08:10:48     INFO - GECKO(1561) |       2        288 libfontconfig.so
[task 2021-11-04T08:10:48.816Z] 08:10:48     INFO - GECKO(1561) | -----------------------------------------------------
[task 2021-11-04T08:10:49.148Z] 08:10:49     INFO - TEST-INFO | started process screentopng
[task 2021-11-04T08:10:49.784Z] 08:10:49     INFO - TEST-INFO | screentopng: exit 0
[task 2021-11-04T08:10:49.784Z] 08:10:49     INFO - Buffered messages logged at 08:10:48
[task 2021-11-04T08:10:49.784Z] 08:10:49     INFO - Entering test bound 
[task 2021-11-04T08:10:49.784Z] 08:10:49     INFO - Run subtest view image with background image
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - Buffered messages finished
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/general/browser_bug734076.js | Uncaught exception - at chrome://mochitests/content/browser/browser/base/content/test/general/browser_bug734076.js:31 - TypeError: can't access property "document", content is null
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - Stack trace:
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - @chrome://mochitests/content/browser/browser/base/content/test/general/browser_bug734076.js:31:31
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - execute@resource://specialpowers/SpecialPowersSandbox.jsm:141:12
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - _spawnTask@resource://specialpowers/SpecialPowersChild.jsm:1656:15
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - receiveMessage@resource://specialpowers/SpecialPowersChild.jsm:310:21
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - Leaving test bound 
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - GECKO(1561) | MEMORY STAT | vsize 20975823MB | residentFast 1606MB
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - TEST-OK | browser/base/content/test/general/browser_bug734076.js | took 791ms
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-11-04T08:10:49.785Z] 08:10:49     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/general/browser_bug734076.js | Found an unexpected tab at the end of test run: about:blank - 
[task 2021-11-04T08:10:49.789Z] 08:10:49     INFO - checking window state
[task 2021-11-04T08:10:49.789Z] 08:10:49     INFO - TEST-START | browser/base/content/test/general/browser_bug749738.js
```