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Even though I have selected Firefox as my default browser, when I click on links in emails or other sources, the actions continue to open in Microsoft Edge. This is a recent phenomena, starting within the past couple of months. I have repeatedly checked my settings, but Firefox always shows as my default browser.What can I do to stop this nuisance? It's a pain to have to copy and paste the web address from Edge to Firefox. Is this an MS hack? Please advise.

Even though I have selected Firefox as my default browser, when I click on links in emails or other sources, the actions continue to open in Microsoft Edge. This is a recent phenomena, starting within the past couple of months. I have repeatedly checked my settings, but Firefox always shows as my default browser.What can I do to stop this nuisance? It's a pain to have to copy and paste the web address from Edge to Firefox. Is this an MS hack? Please advise.

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If the problem is links in the Outlook 365 application, it has its own setting. There's a section on how to change it toward the end of this article:

Setting Firefox as the default browser does not work - What to do

If there are problems in other places, where are they?