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Firefox not working

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SunnyFilms
SunnyFilms
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Firefox works only in troubleshoot mode, and will not copy and paste, I tried and deleted and re-installed, no change, is there a way to run a diagnostic? . other browsers are fine.

Firefox works only in troubleshoot mode, and will not copy and paste, I tried and deleted and re-installed, no change, is there a way to run a diagnostic? . other browsers are fine.