FIrefox used to save usernames and passwords and enter them in the appropriate places - I installed Google Tool bar (now deleted) and this stopped the saving and entering of UNs and PWs - what did Google change?
Typical example, I have 4 Google email accounts. I used to be able to click on the login username and it would give me the 4 choices - when I selected one, it would fill in the username and password for that email account. After Google Toolbar installation, it no longer does that. I tried to use auto-fill-in from the toolbar if that helps. I am now using FireFill to do the auto fill-in of data in forms.
GMail is not hte only place it does not offer suggestion for login info, it is everywhere that a login is required.
All usernames and passwords are saved and show up in the OPTIONS > SAVED PASSWORDS Tab.