My sign in to mozilla/firefox online from a pc ask for my username, not my email associated with mozilla/firefox and I can sign in fine, but when I try to sign in to my firefox acct from my android phone, it asks for my email, not my username so I can't sign in to sync my phone with my firefox acct. It keeps telling me "password incorrect" when I KNOW it is correct. How do I fix this? And there is NO option to sync from my phone while in firefox settings. Does mozilla/firefox website have different sign in accts, one for mozilla support with user name and one for firefox that asks for email address?