A add-on i have been using for years, "imacros" does this in a cinch. Amidst other great things.

https://addons.mozilla.org/en-us/firefox/addon/imacros-for-firefox/

That's not really what I need... The website does not autocomplete my password after I typed my username... Does this has anything to do with scripts?

Hello inyrface, maybe the website using autocomplete=off to prevent Firefox from saving the name and password. BUT you can remove autocomplete=off with a bookmarklet to make Firefox save the name and the password also, see : User name and password not remembered

see also a useful add-on : Saved Password Editor

thank you

The website may be using autocomplete=off to prevent Firefox from saving and filling the name and password.

You can remove autocomplete=off with a bookmarklet to make Firefox save the name and password.

• http://kb.mozillazine.org/User_name_and_password_not_remembered

Make sure that you do not run Firefox in (permanent) Private Browsing mode.

• https://support.mozilla.org/kb/Private+Browsing

• Tools > Options > Privacy: Use custom settings for history
• Deselect: [ ] "Always use private browsing mode"

I have tried the bookmarklet and it says there are no instances of autocomplete=off, but it removed one instance of onsumbit, which is onsubmit="return dologin()". After that, I am unable to login.