Recently when I click on a link from an email, Firefox started opening a new Firefox instead of a tab. I have checked and my option is set to open a new tab

This happens in e-mail and also from other browser windows

Firefox includes options of how to handle different content types, in your case the mailto links are probably set to "Use Firefox". For details of how to fix this see [[Firefox keeps opening many tabs or windows]], in particular the section "Change the action for a content type".

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