Why did Firefox suddenly stop working after an update?

I installed the most recent Firefox update and it now refuses to work. The message I get is: Firefox cannot be opened because of a problem. Check with the developer to make sure Firefox works with this version of Mac OS X.........
I installed the most recent update for OS X. According to Mozilla, it should run on the version I have; 10.6.4
I tried opening the system profiler and it won't even do that. Help!

Mac OS X 10.4 and later - [http://www.mozilla.com/en-US/firefox/system-requirements.html OK].
1) Please take a screenshot of the issue and attach the image to your post.
2) Please explain how you tried to start the profile manager (see also [[Managing profiles]]).

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