Note for Future Dan: if you want Firefox’s picture-in-picture (popout video) mode to be available for videos of less than 45 seconds, the setting you need is media.videocontrols.picture-in-picture.video-toggle.min-video-secs. This is useful if you’ve got a playlist of multiple short clips (which reuse the same <video> element) that you want to treat as a single long video for the purpose of picture-in-picture.

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