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Firefox 79 update - now hyperlinks from Outlook emails won't work at all

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Our computer did an automatic Mozilla update a few days and now the hyperlinks within emails in Outlook will not open in Firefox - an error message comes up saying Application not found.

We have repeatedly updated default programs in Outlook, Firefox and Microsoft Control Panel default applications - they keep reverting to Unknown Application upon restart.

We had a problem with pdf's not opening at all after the update as well and similar problem with it reverting after restart, however have fixed that (we think) through Adobe's settings.

Any idea what else we can try re hyperlinks?


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