Flash Player External Add-On for Watching Movies

Is there any add-on program that I can use in a web browser such as Mozilla Firefox, Google Chrome etc. where for example if I'm watching a video clip on YouTube via Flash Player, I can make the video pop-out and place it anywhere on my desktop while I'm working. So this way, I can resize the movie in the corner of my screen and work at the same time without the movie going in the background. I know there was an add-on for the Opera browser but not sure about the others.
 
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