Mac shutdown will not complete if Firefox has been opened since boot

Shutdown command clears my desktop, but the spinning bars appear ad infinitum, and my G5 has to be powered off. I was using only three applications: iTunes, Safari, and Firefox. Through testing, I have determined that the problem doesn't occur after I have opened Safari by itself, or iTunes by itself. Shutdown hangs only after I have opened Firefox.
== This happened ==
Every time Firefox opened
== Every time I tried to shutdown my G5 in the past three days.

First, try upgrading Firefox to the latest version, 3.6.3. See [[Installing Firefox on Mac]] for details.
If it still happens, see if quitting Firefox before shutting down fixes it. Go to the Firefox menu and choose Quit.
If it still happens after updating to 3.6.3 and after quitting, check the Activity Monitor after quitting Firefox to see if "firefox" or "firefox-bin" is still listed. The activity monitor is located in /Applications/Utilities. In this case, let me know if it's still there after quitting.

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