If my analysis from comment 6 was correct then this affected software decoded video, so doesn't depend on 1526207. Though it's fair to say these tests won't do much if we're now hardware decoding video again, until bug 1526207 is fixed. I also wrote at the time (comment 12) that I consistently saw the test failures in the non-fission test variants too, but that treeherder wasn't reporting them as failures. It would be interesting to know whether that is still the case
Bug 1780687 Comment 27 Edit History
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If my analysis from comment 6 was correct then this affected software decoded video, so doesn't depend on 1526207. Though it's fair to say these tests won't work anyway if we're now hardware decoding video again, until bug 1526207 is fixed. I also wrote at the time (comment 12) that I consistently saw the test failures in the non-fission test variants too, but that treeherder wasn't reporting them as failures. It would be interesting to know whether that is still the case