Can't login using Firefox

I can’t login to this forum using Firefox.

When I click the login/register it says

"You have chose to open <blank> which is a wireless markup language".

I can login using Google Chrome.

Tried clearing FF cache / cookies but didn’t work.

Try a new .mozilla folder (backup the old one)

This is how from a terminal:

mv .mozilla .mozilla-backup

When you launch FF it will be completely like a first launch. Can you login now?

I had created a test user account. So I logged in using that & yes I can login from there.

So just backup the bookmarks & delete the .mozilla folder ?

Backed up the bookmarks a deleted the .mozilla folder.

I can login without any problem.

Thanks.

We lead you down the right path anyway.