Filed by: nbeleuzu [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=336570942&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/TtmUau4rR1mXT_mqysS_6w/runs/0/artifacts/public/logs/live_backing.log
Reftest URL: https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/TtmUau4rR1mXT_mqysS_6w/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2021-04-14T23:55:06.175Z] 23:55:06     INFO - TEST-PASS | browser/components/newtab/test/browser/browser_topsites_section.js | Should find a context menu button - {} == true - 
[task 2021-04-14T23:55:06.179Z] 23:55:06     INFO - Leaving test bound topsites_pin_unpin
[task 2021-04-14T23:55:06.179Z] 23:55:06     INFO - Entering test bound topsites_add
[task 2021-04-14T23:55:06.179Z] 23:55:06     INFO - Buffered messages finished
[task 2021-04-14T23:55:06.179Z] 23:55:06     INFO - TEST-UNEXPECTED-FAIL | browser/components/newtab/test/browser/browser_topsites_section.js | Uncaught exception - No overlay found - timed out after 50 tries.
[task 2021-04-14T23:55:06.179Z] 23:55:06     INFO - Leaving test bound topsites_add
[task 2021-04-14T23:55:06.179Z] 23:55:06     INFO - Entering test bound test_search_topsite_keyword```

@Amy, could you please take a look at these failures? they started to appear on Tier1

Failure log

https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&fromchange=5632c59062ad3ef74b3d6a8b32ea7d8577d63212&searchStr=os%2Cx%2C10.14%2Cwebrender%2Copt%2Cmochitests%2Ctest-macosx1014-64-qr%2Fopt-mochitest-browser-chrome-e10s%2Cbc1&tochange=2007f7ca1ecd8077a6c84e0ba1fec5ca5a4164d1

Set release status flags based on info from the regressing bug 1703941

I will make a followup patch to address these failures, thank you for your help.

https://hg.mozilla.org/mozilla-central/rev/d26e6241a273