Firefox won't open, I get this message: XULRunner - Platform version 8.0.1 is not compatible with miniVersion =7.0.1maxVersion =7.0.1.

When I try to start up Firefox, I immediately get a samll window with the above message. It looks like this:
XULRunner
Platform version 8.0.1 is not compatible with miniVersion>=7.0.1
maxVersion<=7.0.1

Be sure to delete the Firefox program folder before (re)installing Firefox as the usual cause of this problem in that not all files got updated properly and some .ini files like application.ini and platform.ini are still older versions.

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