By visiting the Privacy Settings, you can able to delete all cookies stored by the Firefox browser, how about removing cookies for a single website, have you found this quite new or don’t know about it, here is how you can do that.
Removing Cookies for a single site in Firefox browser
1. Click on Firefox Menu and select Options
2. Click on Privacy and under History, click on down arrow for ‘Firefox will’ and choose ‘ Use custom settings for history‘
3. Click on ‘Show Cookies‘,
4. In the Search field, type the site name for which you want to remove cookies
5. Select the first cookie and press Shift+End to select all cookies in the list and click on Remove Selected.
Caution: Don’t click on ‘Remove All’ because doing so will delete all cookies from Firefox browser.