Filed by: rgurzau [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=268718256&repo=mozilla-central
Full log: https://queue.taskcluster.net/v1/task/QEOgQeXqTjOeUJz-oNJ6Hw/runs/0/artifacts/public/logs/live_backing.log

[task 2019-09-27T05:25:18.454Z] 05:25:18 INFO - TEST-INFO | started process screentopng
[task 2019-09-27T05:25:19.372Z] 05:25:19 INFO - TEST-INFO | screentopng: exit 0
[task 2019-09-27T05:25:19.374Z] 05:25:19 INFO - Buffered messages logged at 05:25:14
[task 2019-09-27T05:25:19.374Z] 05:25:19 INFO - add_task | Entering test test_contentscript_about_blank
[task 2019-09-27T05:25:19.375Z] 05:25:19 INFO - Extension loaded
[task 2019-09-27T05:25:19.376Z] 05:25:19 INFO - Buffered messages logged at 05:25:17
[task 2019-09-27T05:25:19.377Z] 05:25:19 INFO - script ran: all,about:blank,about:blank
[task 2019-09-27T05:25:19.377Z] 05:25:19 INFO - script ran: all,about:srcdoc,about:srcdoc
[task 2019-09-27T05:25:19.378Z] 05:25:19 INFO - script ran: all,top,http://example.com/tests/toolkit/components/extensions/test/mochitest/file_with_about_blank.html
[task 2019-09-27T05:25:19.386Z] 05:25:19 INFO - TEST-PASS | toolkit/components/extensions/test/mochitest/test_ext_contentscript_about_blank.html | exactly 3 scripts ran
[task 2019-09-27T05:25:19.387Z] 05:25:19 INFO - Buffered messages logged at 05:25:18
[task 2019-09-27T05:25:19.388Z] 05:25:19 INFO - script ran: all,about:blank,about:blank
[task 2019-09-27T05:25:19.388Z] 05:25:19 INFO - script ran: all,about:srcdoc,about:srcdoc
[task 2019-09-27T05:25:19.389Z] 05:25:19 INFO - script ran: all,top,http://mochi.test:8888/tests/toolkit/components/extensions/test/mochitest/file_with_about_blank.html
[task 2019-09-27T05:25:19.390Z] 05:25:19 INFO - script ran: mochi_with,about:blank,about:blank
[task 2019-09-27T05:25:19.391Z] 05:25:19 INFO - script ran: mochi_with,about:srcdoc,about:srcdoc
[task 2019-09-27T05:25:19.391Z] 05:25:19 INFO - script ran: mochi_with,top,http://mochi.test:8888/tests/toolkit/components/extensions/test/mochitest/file_with_about_blank.html
[task 2019-09-27T05:25:19.392Z] 05:25:19 INFO - script ran: mochi_without,top,http://mochi.test:8888/tests/toolkit/components/extensions/test/mochitest/file_with_about_blank.html
[task 2019-09-27T05:25:19.393Z] 05:25:19 INFO - TEST-PASS | toolkit/components/extensions/test/mochitest/test_ext_contentscript_about_blank.html | top window text color is red
[task 2019-09-27T05:25:19.394Z] 05:25:19 INFO - Buffered messages finished
[task 2019-09-27T05:25:19.395Z] 05:25:19 INFO - TEST-UNEXPECTED-FAIL | toolkit/components/extensions/test/mochitest/test_ext_contentscript_about_blank.html | top window background is yellow - got "rgba(0, 0, 0, 0)", expected "rgb(255, 255, 0)"
[task 2019-09-27T05:25:19.395Z] 05:25:19 INFO - SimpleTest.is@SimpleTest/SimpleTest.js:322:16
[task 2019-09-27T05:25:19.396Z] 05:25:19 INFO - test_contentscript_about_blank@toolkit/components/extensions/test/mochitest/test_ext_contentscript_about_blank.html:99:5
[task 2019-09-27T05:25:19.397Z] 05:25:19 INFO - asyncnextTick/<@SimpleTest/SimpleTest.js:1795:34
[task 2019-09-27T05:25:19.398Z] 05:25:19 INFO - nextTick@SimpleTest/SimpleTest.js:1811:11
[task 2019-09-27T05:25:19.399Z] 05:25:19 INFO - setTimeout handlerSimpleTest_setTimeoutShim@SimpleTest/SimpleTest.js:686:43
[task 2019-09-27T05:25:19.399Z] 05:25:19 INFO - add_task@SimpleTest/SimpleTest.js:1755:17
[task 2019-09-27T05:25:19.400Z] 05:25:19 INFO - @toolkit/components/extensions/test/mochitest/test_ext_contentscript_about_blank.html:14:9
[task 2019-09-27T05:25:19.401Z] 05:25:19 INFO - Not taking screenshot here: see the one that was previously logged

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