Firefox Locks My MacBook Keyboard

I posted this comment in the following thread:
http://discussions.apple.com/thread.jspa?messageID=6056426#6056426
But I though maybe it would get more feedback in its own thread. Here is what I have found with the keyboard locking issue.
My wife had this issue on her MacBook. She would use it for a while and then suddenly the keyboard was dead. I then found that sometimes it was a hard numlock. If I turned numlock on, I got partial keyboard activity, sometimes being in all caps and no numeric keys would work. In other words, it was as if the numlock was set, even though it wasn't. Turning it on, actually turned it off. At any rate, I got suspicious since it seemed to always happen when she was using Firefox. I told her to switch to Safari, and since she has done that it has not happened again. It has been about a month now with no problems. I firmly believe this is a third party application issue, and Firefox seems to be the common denominator (at least for us). As I frequently tell people when they are testing my code, write down what you were doing/running when it froze (in this case the keyboard) and see what your common denominator is. Maybe you can post it to this list so we can get closer to a real resolution. Hope this helps everyone else.
I should clarify what I mean by third party software issue. I am not blaming bad third party software. I think it is very possible that all the software built by Apple on Leopard (or for Leopard using the expected compilers) will work just fine without causing this issue. I would even hazard a guess that third party apps built the same way would not cause the problem. But having an application built prior to Leopard with another compiler may be the problem. Perhaps Apple has not protected something correctly which is causing the problem. Maybe it is a compiler issue, or something in the Kernel that gets hit just so or in memory (now I am stretching). Maybe the fix will come in the form of locking something down that they missed. At any rate, I hope I clarified my opinion. For what it is worth.
Does anyone else notice this happening when Firefox is running? Or any other specific application?

firefox has serious leopard issues. i can't keep it running for more than 2 hours straight without it becoming unresponsive... i've not had the keyboard issues you've described... but, yeah. mozilla needs to get on top of the game!

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MY MACBOOK KEYBOARD ONLY TYPES IN CAPITAL LETTERS

my macbook keyboard only types in capial letters

And you posted here with a different computer?
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and if so, was the Shift key locked on it? You can
choose to set Keyboard settings to ignore input from
the internal keyboard or trackpad, not sure on external.
{Or have you posted with a USB external keyboard?}
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'Caps Lock key' that shifts this function on/off. There
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