What if I don't have a mobile phone?
Just downloaded/installed Mozilla/Firefox because I'm having problems with Chrome and IE. In the process, it asks for my mobile phone number. What do I do if I don't have a mobile phone? Am I out of luck?
The phone# is for if you want to install Firefox on a Android or a iPhone.
There is no need to give a phone# anywhere in order to use desktop Firefox from www.mozilla.org/firefox/all/ on Windows, Mac OSX, or Linux.