Sometimes when I quit Firefox, it makes my Mac screen turn solid blue. The computer does not crash, but I can't see anything. Help please!

Sometimes when I quit Firefox, it makes my Mac screen display solid blue color. The computer does not crash, but I can't see anything. Opening programs, nor hitting any shortkey makes the display work again, so I have to shut down.
I am using Macbook pro, OS 10.6.8, 4 GB memory, 2 ghz intel processors i7. This has happened about 6 times in the last 3 months. Seems to be getting more frequent. Sometimes happens after using Netflix streaming video, sometimes after browsing sites that don't play video. I frequently use Pandora, but have Firefox set to dump cache, memory, etc. after each use.

Have you tried a safe start by holding the shift key when you boot? If that works, and it can take a while to complete, see if a regular boot now works. If it does, you need to free up space on your hard drive.
If a safe boot doesn't work, you need to either boot from an OS X DVD or go into target disk mode to connect via firewire cable to another mac to free up space on your hard drive. You need 5GB min, with 10% to 15%, or more, better, for systems usage.  If you have a backup, move some data files to it, erase them and empty the trash.

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