Do you mean, for example, that if you click a link like this:

info@example.com

Firefox does not start a new message in Yahoo! mail?

I think you will need to set Firefox to use Yahoo! mail using the Options dialog. Please see this article for the steps: Change the program used to open email links.

Does that work?

Or if you can't open Yahoo! mail at all, try going in through one of these addresses:

• Yahoo home page: https://www.yahoo.com/
• My Yahoo page: https://my.yahoo.com/
• General mail redirect: https://mail.yahoo.com/

Note that many users have discovered problems with bookmarks they saved for the "old" Yahoo mail and need to update them to work with the "new" (neo) Yahoo mail.

Thank you for your assistance with this. The problem has now cleared up. It was possibly caused by a fault with Yahoo mail rather than Firefox,

cheers,