Firefox does not quit automatically after logging out of my computer

Hey, everyone.
Just curious if anyone has experienced a similar problem as me.
I am working on a G5, running Mac OS X (10.4.8) using the newest verson of Firefox 1.5.07.
Intermittently, I cannot log out of my computer without first closing Firefox.
Shouldn't the computer automatically quit out all programs and complete the log out without giving me an error message saying Firefox is still running?
If anyone can help, I'd really appreciate the input.
Thanks,
boneyo

Do you have multiple tabs open at the time, with the option to "confirm multiple tab close on exit"?
Because that would halt something trying to quit Firefox - Firefox itself won't quit without that input, and logging out won't Force Quit.
If this sounds like the problem, try not confirming multiple tab closure on exit, and then logging out and see?
Intel C2D 2.16GHz iMac 24" w/ 2GB RAM   Mac OS X (10.4.8)  

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