Firefox Community Forum

I am running a desktop with Win 11 pro with all the updates. I have Firefox as my web browser and Thunderbird for my email accounts, Talktalk, Aol and gmail. When I try to open a web page with a mailto link, although Firefox is set as default it will not open the link, oddly it will work with gmail. I do not have this problem with my other desktop running Win 7. How do I get it to work on Win 11. Please note I am a 80 year old and totally illiterate computerwise. Therefore I need the answer to be step by step and when you say open this or that please tell me how to open it. Geoff

When I try to open a link from a different app, e.g. from calibre to open the Updates link, firefox opens a new instance instead of opening a new tab in the current instance. This causes the browser to throw an error and never open the link.

is this fixable?

thanks