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by shadowgovt 1907 days ago
> They should have it all working flawlessly at their scale

Insufficient economic incentives.

Firefox is ~4% of the installed base for web browsers (as per externally-visible metrics). The priority for bug fixing is going to look something like Chrome -> Chrome (mobile devices) -> Safari -> Safari (mobile devices) -> Edge -> Firefox.

... additionally, if the same behavior works correctly in Chrome, Safari, and Edge, it unfortunately indicates it's more likely to be a standards-noncompliance bug on Mozilla's side than an error in the YouTube implementation.

EDIT: Specifically, it might be this bug. https://bugzilla.mozilla.org/show_bug.cgi?id=1487102