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When clicking on an external link I get a message saying "You've launched an older version of Firefox".

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When clicking on an external link I get a message saying "You've launched an older version of Firefox". My options are to Exit or create a new profile. I've created a new profile twice now, still get the same message when clicking on an external link.

When clicking on an external link I get a message saying "You've launched an older version of Firefox". My options are to Exit or create a new profile. I've created a new profile twice now, still get the same message when clicking on an external link.

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Sorry to hear about this problem. You may have more than one version of Firefox installed on your system. The one you used to post this question indicates it is the current 85.0.1 release, so external links may be triggering an older one. Let's try to sort this out.

On 64-bit Windows 10, the two most common installation folders for Firefox are:

  • C:\Program Files\Mozilla Firefox (64-bit programs)
  • C:\Program Files (x86)\Mozilla Firefox (32-bit programs, 64-bit Firefox after an in-place update from 32-bit)

If your shortcut starts one but Windows thinks your default browser is in the other, that can cause this problem.

Could you check whether you have two installations? If so, before removing anything, please set your Windows default browser to Internet Explorer or Edge temporarily to avoid possibly breaking programs like Office.