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Your directions don't work. I need to install a profile.Please tell me how

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I can't open Firefox. I keep getting the message that my profile is either missing or inaccessible. It worked fine for many years then all of a sudden it stopped. Please help!!!!

I can't open Firefox. I keep getting the message that my profile is either missing or inaccessible. It worked fine for many years then all of a sudden it stopped. Please help!!!!

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If the instructions in the How to run Firefox when your profile is missing or inaccessible support article don’t help, please see if the solution in this question does.