If you have a dual monitor setup, you’ve probably tried to watch a flash video on one screen while working on the other. As you likely know by now, it doesn’t work – as soon as you click the mouse on the other screen, the Flash video snaps back to regular size. Pretty annoying, I know.

Fortunately, there’s a way around this. Polish blogger D.I.Z. has created a patch that will allow you to watch a full screen video on one monitor while working on another. The patch, a single DLL file, is available at his blog.

To install the patch, you simply download a single DLL file & replace the version on your system.

This hack should work in Windows XP, Windows Vista, and Windows 7.  And of course, if you upgrade your flash player, you will lose the changes.  Bookmark this page so you check back for new versions of the DLL file needed for future releases.

Link to D.I.Z.’s blog.

Found at  Lifehacker.

A Reddit thread on the matter.