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Re:Firefox Picture-in-Picture by apetresc on Wednesday July 08, 2020 @02:17PM (#23772688)
Sorry, which extension is this? The only one I was able to find named "Open With" is pretty clearly not what you were referring to.
Re:Firefox Picture-in-Picture by ubercow13 on Wednesday July 08, 2020 @02:47PM (#23773000)
I prefer this one as it is potentially more secure than some of the other ones

https://github.com/grmat/play-with

Re:Firefox Picture-in-Picture by catalogia on Wednesday July 08, 2020 @02:48PM (#23773019)
This is the one I currently use: https://github.com/darktrojan/openwith Perhaps play-with is a better choice.
Re:Firefox Picture-in-Picture by vezycash on Wednesday July 08, 2020 @02:26PM (#23772787)
MPV is a player. https://mpv.io/
Re:Firefox Picture-in-Picture by apetresc on Wednesday July 08, 2020 @02:56PM (#23773097)
Oh, I know all about MPV. Invoking it cleanly from within Firefox is the part I was asking about (and which has been answered :)