Bug#863058: firefox-esr: can't play videos on Vimeo

[Vincent Lefevre]

Control: retitle -1 firefox-esr: can't play videos on Vimeo if media.autoplay.enabled is set to false
Control: tags -1 upstream
Control: forward -1 https://bugzilla.mozilla.org/show_bug.cgi?id=1231886

I've eventually found the cause here:
  https://askubuntu.com/questions/777489/vimeo-video-not-playing-in-firefox

(There are may pages about issues with Vimeo, it was a bit difficult
to find the right one...)

Then I've found an upstream bug...

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)