Hi, Go to http://coub.com/ with Advanced Layers enabled (default on recent nightly) video will not work or will render only 1/4 of the image. Tell me if you need more info, but it is instantly reproducible. So you should be able to see whats going on.
Created attachment 8886778 [details] aboutsupport.txt I can repro the "Quarter video" part on Win10x64 with Intel graphics. Attached is my about:support
And with todays nightly update https://hg.mozilla.org/mozilla-central/rev/bd1b6a4e5d8e1184a89ae60a74fd86d3d4a9e95c the "quarter video" part no longer reproduces
This is strange, because Advance Layers were blacklisted for Intel before in previous nightly. Anyway the issue was fixed in bug 1380744.
Status: UNCONFIRMED → RESOLVED
Last Resolved: a year ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1380744
FWIW, the Intel block has been lifted in the most recently Nightly, since we were able to work around it.
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