Sorry to dig out such an old bug, but I just ran into this and wonder if it should be re-evaluated. IE and classic Edge are no more, so on Windows Firefox is probably the only browser not playing these videos, similar on Linux, potentially MacOS as well. Further more the current approach seems to also block downloads, which prevents people to use local players - that's certainly a bug. Jean, do you mind having another look if it's still useful? If so, I'll create a bug for the download issue, but I'd prefer to see it fully removed.
Bug 1291742 Comment 39 Edit History
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Sorry to dig out such an old bug, but I just ran into this and wonder if it should be re-evaluated. IE and classic Edge are no more, so on Windows Firefox is probably the only browser not playing these videos, similar on Linux, potentially MacOS as well. Further more the current approach seems to also block downloads, which prevents people to use local players - that's certainly a bug. Jean, do you mind having another look if it's still useful? If so, I'll create a bug for the download issue, but I'd prefer to see it fully removed. P.S.: here is a link, might get updated at some point though: https://upload.video.fosdem.org/r/b8d0d06522d1da2c161222db7ac65deeb4e92c19d0e2f2aa622ebf0a2cd2acd5