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"Missing Profile" cannot even open Firefox
I am on Mac OS 10.13.6 and I cannot open Firefox and it says Profile Missing, and will not open. I don't care about any bookmarks or anything I just want to use Firefox as an alternative browser to Safari.
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Could you try the steps in the following article: How to run Firefox when your profile is missing or inaccessible.
Does that work on your Mac?
@actionimages, I'm a bit late to the party. But i've had this happen twice now on OS. I've add success by doing the following: 1. uninstall firefox 2. Go to ~\Library\Cache.txt and delete this file (you can access Library from finder and holding the option key while clicking on "Go") 3. reinstall firefox.