Filed by: apavel [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=283614076&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/GCw3wSnDQx-LYUcf7J5oRA/runs/0/artifacts/public/logs/live_backing.log

[task 2020-01-06T14:07:48.879Z] 14:07:48 INFO - TEST-START | /mixed-content/gen/top.http-rp/opt-in/beacon/same-https.keep-scheme.https.html
[task 2020-01-06T14:07:48.879Z] 14:07:48 INFO - Closing window 30
[task 2020-01-06T14:07:51.137Z] 14:07:51 INFO -
[task 2020-01-06T14:07:51.137Z] 14:07:51 INFO - TEST-UNEXPECTED-FAIL | /mixed-content/gen/top.http-rp/opt-in/beacon/same-https.keep-scheme.https.html | Mixed-Content: Expects allowed for beacon to same-https origin and keep-scheme redirection from https context. - assert_equals: The resource request should be 'allowed'. expected "allowed" but got "blocked"
[task 2020-01-06T14:07:51.137Z] 14:07:51 INFO - checkResult/<@https://web-platform.test:8443/mixed-content/generic/test-case.sub.js:30:24
[task 2020-01-06T14:07:51.466Z] 14:07:51 INFO - TEST-OK | /mixed-content/gen/top.http-rp/opt-in/beacon/same-https.keep-scheme.https.html | took 2591ms
[task 2020-01-06T14:07:52.671Z] 14:07:52 INFO - Closing logging queue
[task 2020-01-06T14:07:52.671Z] 14:07:52 INFO - queue closed
[task 2020-01-06T14:07:52.678Z] 14:07:52 INFO - Setting up ssl
[task 2020-01-06T14:07:52.754Z] 14:07:52 INFO - certutil |
[task 2020-01-06T14:07:52.830Z] 14:07:52 INFO - certutil |
[task 2020-01-06T14:07:52.846Z] 14:07:52 INFO - certutil |
[task 2020-01-06T14:07:52.846Z] 14:07:52 INFO - Certificate Nickname Trust Attributes
[task 2020-01-06T14:07:52.846Z] 14:07:52 INFO - SSL,S/MIME,JAR/XPI
[task 2020-01-06T14:07:52.846Z] 14:07:52 INFO -
[task 2020-01-06T14:07:52.846Z] 14:07:52 INFO - web-platform-tests CT,,
[task 2020-01-06T14:07:52.846Z] 14:07:52 INFO -
[task 2020-01-06T14:07:55.604Z] 14:07:55 INFO - adb Granting important runtime permissions to org.mozilla.geckoview.test
[task 2020-01-06T14:07:57.190Z] 14:07:57 INFO - adb launch_application: am start -W -n org.mozilla.geckoview.test/org.mozilla.geckoview.test.TestRunnerActivity -a android.intent.action.MAIN --es env9 MOZ_DISABLE_NONLOCAL_CONNECTIONS=1 --es env8 R_LOG_DESTINATION=stderr --es args "-no-remote -profile /sdcard/tests/profile --marionette about:blank" --es env3 MOZ_HIDE_RESULTS_TABLE=1 --es env2 R_LOG_VERBOSE=1 --es env1 MOZ_WEBRENDER=0 --es env0 MOZ_CRASHREPORTER=1 --es env7 MOZ_CRASHREPORTER_SHUTDOWN=1 --es env6 MOZ_IN_AUTOMATION=1 --es env5 MOZ_LOG=signaling:3,mtransport:4,DataChannel:4,jsep:4 --es env4 STYLO_THREADS=4 --ez use_multiprocess True --es env12 R_LOG_LEVEL=6 --es env11 MOZ_PROCESS_LOG=/tmp/tmpLFpXGxpidlog --es env10 MOZ_CRASHREPORTER_NO_REPORT=1
[task 2020-01-06T14:07:58.788Z] 14:07:58 INFO - Starting runner

This probably is related to bug 1606865.