The following layout test is flaky on GTK http/tests/security/video-cross-origin-accessfailure.html It does not seem flaky when run individually on my computer, but it has a flaky behavior in the bots.
*** Bug 176108 has been marked as a duplicate of this bug. ***
This test, or group of tests, was marked as flaky but the test(s) has been consistenly failing for the last 4000 revisions. Baseline of test was updated and removed from test expectations in r278604. Closing bug.