Firefox and DownloadHelper: Getting some video let screen go all black!

Sometimes when I use Firefox 3.5.6 with DownloadHelper to get some Youtube flash vids, the screen of my MBP (or iMac as well) goes black and the only thing I see is my mouse pointer.
Then I try to go on sleep mode but when it doesn't work i have to quit my macs and get a fresh start.
What happened?

Both programs are third party. Contact their developers. There may be a conflict with the combination of their software. Do you really need DownloadHelper?

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