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‘Firefox froze while updating generating a XUL Runner Error Message "Error:Platorm version '121.0' is not compatible with minVersion>=120.0.1 maxVersion<+120.0.1’
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An error message like XPCOM missing or about platform version or entry points not found can happen because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox installation 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.
Reinstall Firefox: