Just to be clear - so if I go into my saved usernames/passwords section of firefox and tell it not to remember the IJ ones it means I can change the userpic when I post without a problem?

Cool, thank you for that, that's really helpful to know. It was bugging me yesterday when I'm trying to move all my stuff from LJ over to here and some posts (ie fic challenges) I want to have specific userpics with. I was having to post and then edit.