Completely useless. Does not stay on top of the screen.

Simple and efficient - Love it !

Best Pop out/ Picture in picture player. Thanks Dev.

this app does not work, i need to get to the firefox asian website to comment on this, because on the french version i am not even able to leave a comment, that s a shame. App not working at all for me rebooted my firefox, add one enable, does not work. very sad

For anyone missing ALWAYS ON TOP feature. There is small utility which I run automatically with Windows startup. Hitting CTRL+SPACE will make any window to be ALWAYS ON TOP. It is useful not only for video popup but also if I need Excel, terminal or anything to be always on my screen. Download here, no install needed:
http://img.labnol.org/di/always-on-top.zip

Coming from Opera I missed the popout video feature. I tried few add-ons that did not work at all before I found this one. This one works flawlessly, and the setting to chose pop-out video size makes it better than anything I tried so far. The only thing that can get better is the icon used, but this is nitpicking.

this needs ALWAYS ON TOP feature to be truely great

Very good but not wow as "InstantView for YouTube" on chrome store...