Filed by: csabou [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=259521128&repo=mozilla-central
Full log: https://queue.taskcluster.net/v1/task/TFa9wxVBR5ihwaEGO5Gr8Q/runs/0/artifacts/public/logs/live_backing.log

[task 2019-08-02T05:15:42.733Z] 05:15:42 INFO - TEST-PASS | toolkit/components/antitracking/test/browser/browser_urlDecorationStripping.js | callbackAfterRemoval must be passed when accessRemoval is non-null -
[task 2019-08-02T05:15:42.733Z] 05:15:42 INFO - Creating a new tab
[task 2019-08-02T05:15:42.734Z] 05:15:42 INFO - Creating a 3rd party content
[task 2019-08-02T05:15:42.735Z] 05:15:42 INFO - Console message: [JavaScript Error: "The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol." {file: "https://sub1.xn--hxajbheg2az3al.xn--jxalpdlp/browser/toolkit/components/antitracking/test/browser/page.html" line: 0}]
[task 2019-08-02T05:15:42.737Z] 05:15:42 INFO - Console message: [JavaScript Warning: "Request to access cookie or storage on “https://tracking.example.org/browser/toolkit/components/antitracking/test/browser/3rdParty.html” was blocked because it came from a tracker and content blocking is enabled." {file: "https://sub1.xn--hxajbheg2az3al.xn--jxalpdlp/browser/toolkit/components/antitracking/test/browser/page.html" line: 0}]
[task 2019-08-02T05:15:42.737Z] 05:15:42 INFO - Buffered messages logged at 05:13:28
[task 2019-08-02T05:15:42.739Z] 05:15:42 INFO - Console message: [JavaScript Warning: "Request to access cookie or storage on “https://tracking.example.org/browser/toolkit/components/antitracking/test/browser/3rdParty.html” was blocked because it came from a tracker and content blocking is enabled." {file: "about:blank" line: 0}]
[task 2019-08-02T05:15:42.741Z] 05:15:42 INFO - Console message: [JavaScript Error: "The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol." {file: "https://tracking.example.org/browser/toolkit/components/antitracking/test/browser/3rdParty.html" line: 0}]
[task 2019-08-02T05:15:42.742Z] 05:15:42 INFO - Sending code to the 3rd party content
[task 2019-08-02T05:15:42.743Z] 05:15:42 INFO - Console message: [JavaScript Error: "TypeError: is not a valid URL." {file: "https://tracking.example.org/browser/toolkit/components/antitracking/test/browser/3rdParty.html line 37 > eval" line: 2}]
[task 2019-08-02T05:15:42.747Z] 05:15:42 INFO - Buffered messages logged at 05:14:12
[task 2019-08-02T05:15:42.748Z] 05:15:42 INFO - Longer timeout required, waiting longer... Remaining timeouts: 2
[task 2019-08-02T05:15:42.749Z] 05:15:42 INFO - Buffered messages logged at 05:14:57
[task 2019-08-02T05:15:42.750Z] 05:15:42 INFO - Longer timeout required, waiting longer... Remaining timeouts: 1
[task 2019-08-02T05:15:42.751Z] 05:15:42 INFO - Buffered messages finished
[task 2019-08-02T05:15:42.752Z] 05:15:42 INFO - TEST-UNEXPECTED-FAIL | toolkit/components/antitracking/test/browser/browser_urlDecorationStripping.js | Test timed out -
[task 2019-08-02T05:15:42.753Z] 05:15:42 INFO - GECKO(15793) | MEMORY STAT | vsize 3299MB | residentFast 329MB | heapAllocated 88MB
[task 2019-08-02T05:15:42.753Z] 05:15:42 INFO - TEST-OK | toolkit/components/antitracking/test/browser/browser_urlDecorationStripping.js | took 135071ms

Looks to be from bug 1568341. Ehsan, please take a look over it. It fails on central on fission jobs after Bug 1569832. https://hg.mozilla.org/mozilla-central/rev/20c6bad5230d891c7b5bdadb24522aa9c80b513a

I'm disabling the test on Fission.

https://hg.mozilla.org/mozilla-central/rev/edd358b57922