Some pages disable the auto fill capabilities of Firefox notably Yahoo and MS Live/Hotmail. If you can tell us specific pages you are having problems with we can take a look and see if there is anything that can be done.

So far I've only found one website that autofilled the password after I manually entered the username. Otherwise I can't find any websites that autofill on Android - and they all do on desktop. Should they just fill when they load or do I need to do something?

Working much better with today's update. Unfortunately one of my most common sites still doesn't work but it behaves a little oddly on the desktop too. They are IE-centric. http://flica.net I have contacts there if anyone sees any obvious issues I can pass on to them.

They specify in the code not to remember usernames and passwords.

line 306, 319, and 467 autocomplete="off"

Thanks!