Firefox 3.6 suddenly won't open in Mac OS 10.6.4

I suddenly can't open Firefox 3.6. This is my main browser. I keep getting a Mac error message asking me if this is the correct version of Firefox, then it tells me tomupdate it. It has always worked fine. I just did some scheduled OS security update that Apple recc'ed. Could this be the cause?

You can try to trash the current Firefox version and reinstall Firefox from http://www.mozilla.com/firefox/all.html

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    01/01/2013 21:58:52.431 com.apple.launchd.peruser.501[473]: (com.apple.photostream-agent) Throttling respawn: Will start in 10 seconds
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