For some reason MMO Champion is the only site I use where Firefox doesn't autofill the username & password fields. I either have to right click in the username field to select it, or press login with the fields empty to get the 'failed attempt' screen where the username and password are actually filled in.
Anyone know why this might be happening? 'Fill usernames and passwords automatically' is checked. A search suggests this is a site-specific issue and not necessarily a fault with Firefox.