"Passwords Cleaner" is the easiest way to clear your browser stored passwords for a specified period. You can define a custom period on the options page. Also, you can define the area (zone) in which you want the data to be cleared.
Using this extension it is possible to wipe cookies of three different zones: 1. Normal websites, 2. Protected websites (not supported in Firefox yet), 3. Extension zone (not supported in Firefox yet)
Definitions: -> Extensions zone: Extensions and packaged applications a user has installed -> Protected websites zone: Websites that have been installed as hosted applications
