This is a tracking bug for issues that don't necessarily block turning MSE on for Nightly (which is depends mostly on DASHIF and YouTube compat), but block shipping it to the Web. See the discussion in bug 1086525 comment 5.
Maybe this one ? https://bugzilla.mozilla.org/show_bug.cgi?id=1089525
Component: Audio/Video → Audio/Video: Playback
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → WORKSFORME
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