Firefox icon has a white "no" symbol (circle with diagonal line from top left to bottom right) superimposed over it. Clicking it yields: "The application 'Firefox' cannot be launched" followed by: "-10661"

I’m a novice and a Mac user. Don’t know computer lingo. About a week ago, while working at computer, I received repeated unsolicited messages, presumably from Firefox, to update to Firefox 4.0. I attempted to comply by clicking, but maybe clicked something wrong and now can’t open Firefox. Hope I don’t lose all my bookmarks. Advice welcome.
Possibly unrelated - highlighting the icon then clicking “Get Info” yields “Kind: Application (Intel)”. Only mentioning this because, being an “iMac G5 / PowerMac8,2 / PowerPC G5 (3.0) / Version 10.4.11”, this computer doesn’t have Intel processors.
Thanks

You're welcome.
Please click the '''Helpful''' button next to the answer that solved your Firefox support issue, '''when you are logged in''', so this thread gets marked as '''Solved''' to help other users who may have this same problem.

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