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Firefox 80.10.1 on WIN 10 cannot be used as default browser because it is not included in the list of browsers proposed by the selection procedure

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Firefox 80.10.1 on WIN 10 cannot be used as default browser because it is not included in the list of browsers proposed by the selection procedure of choice del browser

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Some users had this issue after the Windows 10 Microsoft Edge update. If you reinstall Firefox, it should reappear on the list of browsers.

If it doesn't, there's a manual way to add it, but generally it will come back if you reinstall.

You shouldn't lose any Firefox data, but it's always best to back up your data BEFORE reinstalling Firefox, just to be on the safe side. If your data (bookmarks, etc) doesn't appear in Firefox after reinstalling, the Recover user data missing after Firefox update will have the steps you need to fix it.

Hope this helps.