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I cannot open Firefox.
I cannot open Firefox. It says "Error platform version '101.1' is not compatible with mini version = 101.0 maxi version 101.0" Please tell me how to get back into Firefox. Susan Peckitt
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An error message about XPCOM missing or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files. You need to do a clean reinstall and remove the Firefox program folder to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.