Filed by: btara [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=331278920&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/QcKqglh6SrWAHCL8uekBzA/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/QcKqglh6SrWAHCL8uekBzA/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2021-02-26T00:51:00.581Z] 00:51:00     INFO - TEST-START | browser/components/customizableui/test/browser_ctrl_click_panel_opening.js
[task 2021-02-26T00:51:00.642Z] 00:51:00     INFO - TEST-INFO | started process screenshot
[task 2021-02-26T00:51:00.721Z] 00:51:00     INFO - TEST-INFO | screenshot: exit 0
[task 2021-02-26T00:51:00.721Z] 00:51:00     INFO - Buffered messages logged at 00:51:00
[task 2021-02-26T00:51:00.721Z] 00:51:00     INFO - Entering test bound test_appMenu_mainView
[task 2021-02-26T00:51:00.721Z] 00:51:00     INFO - Buffered messages finished
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - TEST-UNEXPECTED-FAIL | browser/components/customizableui/test/browser_ctrl_click_panel_opening.js | Uncaught exception - at resource://testing-common/BrowserTestUtils.jsm:1203 - TypeError: can't access property "addEventListener", subject is null
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - Stack trace:
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - waitForEvent/<@resource://testing-common/BrowserTestUtils.jsm:1203:7
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - waitForEvent@resource://testing-common/BrowserTestUtils.jsm:1202:12
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - test_appMenu_mainView@chrome://mochitests/content/browser/browser/components/customizableui/test/browser_ctrl_click_panel_opening.js:21:39
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - Tester_execTest/<@chrome://mochikit/content/browser-test.js:1089:34
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - Tester_execTest@chrome://mochikit/content/browser-test.js:1129:11
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - nextTest/<@chrome://mochikit/content/browser-test.js:943:14
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:1037:23
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - Leaving test bound test_appMenu_mainView
[task 2021-02-26T00:51:00.722Z] 00:51:00     INFO - Entering test bound test_appMenu_libraryView
[task 2021-02-26T00:51:00.723Z] 00:51:00     INFO - GECKO(4908) | [Parent 800, Main Thread] WARNING: '!mPresContext', file /builds/worker/checkouts/gecko/dom/events/UIEvent.cpp:138
[task 2021-02-26T00:51:00.970Z] 00:51:00     INFO - TEST-PASS | browser/components/customizableui/test/browser_ctrl_click_panel_opening.js | Library menu shown after button pressed - 
[task 2021-02-26T00:51:00.988Z] 00:51:00     INFO - GECKO(4908) | [Parent 800, Main Thread] WARNING: NS_ENSURE_TRUE(weakFrame.IsAlive()) failed: file /builds/worker/checkouts/gecko/layout/xul/nsXULPopupManager.cpp:1068
[task 2021-02-26T00:51:01.007Z] 00:51:01     INFO - Leaving test bound test_appMenu_libraryView
[task 2021-02-26T00:51:01.076Z] 00:51:01     INFO - GECKO(4908) | MEMORY STAT | vsize 2104274MB | vsizeMaxContiguous 65390552MB | residentFast 308MB | heapAllocated 103MB
[task 2021-02-26T00:51:01.076Z] 00:51:01     INFO - TEST-OK | browser/components/customizableui/test/browser_ctrl_click_panel_opening.js | took 499ms```

Set release status flags based on info from the regressing bug 1693851