Bug 1208316 landed with a hack to when we make MediaStreams go inactive when they originate from HTMLMediaElement.mozCaptureStream where the media element is playing a non-MediaStream source. Because such a mozCaptureStream MediaStream recreates all its tracks on seek (bug 1172394) it would cause a HTMLMediaElement playing the stream to end unintentionally - bug 1208316 was partially about making this change to HTMLMediaElement. When bug 1172394 gets fixed we should remove this hack.
Mass change P3->P4 to align with new Mozilla triage process.
Priority: P3 → P4
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