I know YouTube does that nicely when you are logged into Google, but I'd love to understand if this could also be possible via Firefox Accounts. You watch a video on Desktop, and want to continue watching it when you open it on another device, remember playback time, for any video player, e.g. embedded Vimeo, other propriety players.
I think this would be really hard to implement, I don't know that it's worth trying to do this.
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