Both Internet Explorer and Firefox offer to save a password every time you type one in. If you think about it, you probably realize it isn't a great idea, but it's SO convenient.
Remember this: For the browser to type the password, it needs to be readable, so anyone with access to your computer can see the passwords under certain conditions.
1. Firefox: All your remembered passwords can be viewed unless you set a master password. Go to Tools->Options-> Security and set a master password. This will encrypt the passwords. It isn't perfect, but it's a start.
2. Internet Explorer. Don't let it remember passwords. It's too easy for another person on your machine or a piece of malware to get them. If you don't believe me, go to nirsoft and see IE Passview
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