Download Video From Youtube to play outside with Firefox Add-ons

Did you ever experience any problems When you want to watch Video Youtube and other websites Or doing something else simultaneously ? If you can see Video
Youtube and Other Sites simultaneous Is it good ?
PopVideo is an Add-on Firefox can download Video from Youtube play outside And can modify its size To put somewhere For the time you 're Open the home page .
It is easy to use , after you install it , and when you put Mouse over any video you will see a blue Video Icon in the upper right of the Video.
 
Then you just click on the Icon, then Video Pop Up When You Resize Video Resize.

 
And if you want it to go in there, you just click on the image that it has replaced our Video in..