Since you're using Win 10, you should make whichever browser you normally use (e.g. I.E. or Edge) the default.
Reinstalling Firefox, then making I.E. or Edge the default browser before uninstalling Firefox again is another approach you might try.
Simply copying registry settings from another PC is a bad idea unless you know beforehand they're what you need.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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