Delete site storage for individual website
- Click the menu button and select Options
- In the Cookies and Site Data section, click Manage Data…. You'll see a list of sites and how much information each site is storing on your computer.
- Click the site you want to remove and click Remove Selected (or click Remove All to remove all stored cookies and site data).
- Click Save Changes to finish.
(For more information about clearing cookies for individual (or all) websites, see Clear cookies and site data in Firefox.)