If you use a shared computer, you may want to make some changes in your Firefox Browser Options..Firefox will "store" passwords and you can change that setting to "off" -As I recall, it is set to "on" as it's default--so every time you reinstall firefox--you will want to go back and turn it "off."
-If you use the "form fill" feature, then your passwords will be there.
-It will show the site, username, and password.
-For privacy, it is best to set it to "off" to keep the data away from other user's of the computer and from outsider intruders.
-Also, for numerous reasons, it isn't wise to have websites remember your passwords in the first place.
To turn it "off"
Click Tools->Options->Security Tab->Uncheck "remember passwords"
**Of course, this could be used to obtain
other people's data
