Like other browsers, Firefox also stores the login details such as username, password for every website visited by the user at the user consent. All these secret details are stored in Firefox sign-on database securely in an encrypted format.

FirePasswordViewer can instantly decrypt and recover these secrets even if they are protected with master password.

Also it can be used to recover passwords from different profile (for other users on the same system) as well as from the different Operating system (such as Linux, Mac etc). This greatly helps Forensic Investigators who can copy the Firefox profile data from the target system to different machine and recover the passwords offline without affecting the target environment.