When I tried opening Firefox this morning it doesn't open and this is what I see in "Applications?


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Several possible explanations. Simplest fix however is to just delete Firefox from your applications folder, go download it again, then re-open. That should solve it. If not, then that would mean other support files (like preferences) would be bad but that's doubtful.

Be sure to drag the newly downloaded application into the applications folder before opening it. I encounter lots of people that download apps to their desktops or downloads folder then only launch them from there. The App wants to live in the Applications folder. Otherwise, permissions issues will arise over time.