Okay, so if you read my last post, I have been reading the Limewire blog. And I read a very interesting and important entry. Basically it amounts to an easy way for someone to look at your passwords for all of your saved passwords on firefox.
Go to Tools and then Options. Pick the Privacy tab. (Your menu may look a little different from mine.) Some smaller tabs will come up. Third from the left is "Passwords". Click on that. Click on "Set Master Password..." put in your password that you're going to remember. Until you have that set, anyone can go to the "View Saved Passwords" and view all the of the sites that you have told Firefox to save the passwords for. You can also look at all the sites you told it not to save for. Anyway, this protects you from an easy breach of privacy. They would just have to sit down at your computer. Well, I hope that helps out.
PS - So I did this myself today. Well, it puts up a password entry window about every time you start Firefox. Annoying! So, I guess you could take your chances, or you could erase all the sites there and not have Firefox remember your passwords, or just deal with the annoyance.