May have been tricked to accepting false update yesterday 8-20-11 how do I find determine whether false update was installed?

While working today on our old XP, I was told Firefox update failed because it was a trick. Yesterday a Firefox updated was okayed on our laptop (Vista). How can I tell if we have infected ourselves? Thanks.

This issue can be caused by the presence of leftover files in the Firefox program folder (defaults\pref) like a file firefox.js that overrides the update URL with a wrong link.
Do a clean reinstall and be sure to remove the Firefox program folder to remove the file(s) that cause the problem.
See:
*[[/questions/826858]]
See also comment 36:
*[https://bugzilla.mozilla.org/show_bug.cgi?id=653830#c36 Bug 653830] - Popup notice Software Update - Update Failed - Something is trying to trick Firefox into accepting an insecure

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