Filed by: nfay [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=397530122&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Pz6Dii4XQHqDH1qkS7qqkQ/runs/0/artifacts/public/logs/live_backing.log

[task 2022-11-24T00:45:42.059Z] 00:45:42     INFO - TEST-PASS | devtools/client/framework/test/browser_toolbox_hosts.js | host type is bottom - 
[task 2022-11-24T00:45:42.064Z] 00:45:42     INFO - TEST-PASS | devtools/client/framework/test/browser_toolbox_hosts.js | host pref is bottom - 
[task 2022-11-24T00:45:42.068Z] 00:45:42     INFO - TEST-PASS | devtools/client/framework/test/browser_toolbox_hosts.js | The previous host is correct - 
[task 2022-11-24T00:45:42.072Z] 00:45:42     INFO - Buffered messages logged at 00:45:39
[task 2022-11-24T00:45:42.076Z] 00:45:42     INFO - Console message: [JavaScript Error: "NotFoundError: No such JSWindowActor 'DevToolsFrame'"]
[task 2022-11-24T00:45:42.080Z] 00:45:42     INFO - Leaving test bound runNonFissionWindowTest
[task 2022-11-24T00:45:42.085Z] 00:45:42     INFO - TEST-PASS | devtools/client/framework/test/browser_toolbox_hosts.js | The main process DevToolsServer has no pending connection when the test ends - 
[task 2022-11-24T00:45:42.088Z] 00:45:42     INFO - Buffered messages finished
[task 2022-11-24T00:45:42.094Z] 00:45:42     INFO - TEST-UNEXPECTED-FAIL | devtools/client/framework/test/browser_toolbox_hosts.js | This test exceeded the timeout threshold. It should be rewritten or split up. If that's not possible, use requestLongerTimeout(N), but only as a last resort. - 
[task 2022-11-24T00:45:42.098Z] 00:45:42     INFO - GECKO(1641) | MEMORY STAT | vsize 3957MB | residentFast 669MB | heapAllocated 331MB
[task 2022-11-24T00:45:42.102Z] 00:45:42     INFO - TEST-OK | devtools/client/framework/test/browser_toolbox_hosts.js | took 128613ms
[task 2022-11-24T00:45:42.106Z] 00:45:42     INFO - checking window state
[task 2022-11-24T00:45:42.110Z] 00:45:42     INFO - TEST-START | devtools/client/framework/test/browser_toolbox_hosts_size.js

First occurrence so far: https://treeherder.mozilla.org/jobs?repo=autoland&searchStr=Linux%2C18.04%2Cx64%2CWebRender%2Copt%2CDevTools%2CMochitests%2Cwith%2CEFT%2Cwithout%2Cfission%2Cenabled%2Ctest-linux1804-64-qr%2Fopt-mochitest-devtools-chrome-dt-no-eft-nofis%2Cdt3&tochange=1a567e4b4bd7c398064d70d1278cf3e8817cfb3b&fromchange=b12f89a6bbffe2c243b664c4a4f60cd8a7b1c65c&group_state=expanded&selectedTaskRun=Pz6Dii4XQHqDH1qkS7qqkQ.0

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.

New failure instance: https://treeherder.mozilla.org/logviewer?job_id=466376111&repo=autoland