Completely useless. Does not keep window on top.

This has some issues to begin with. First, it doesnt work on youtube since it shows it works while right clicking on video. Second, it reloads the video and doesnt take it exactly with same time frame and video settings to a pop-up window. Third, it doesnt work as pop-up fully if you are working on another browser and watching videos from youtube from firefox or firefox forks like floorp browser or librewolf browser or waterfox browser or iceraven browser. Needs work.

DOES NOT WORK!
The same old story: it works with the authors system.
And the author believes, that it must work everywhere.