How to Remove Mozilla cookies

Mozilla

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.


Mozilla Firebird

Click on Tools, then Options
Select the Privacy icon in the left-hand panel
Click on Cookies
Click on Stored Cookies
To remove a single cookie click on the entry in the list and click on the Remove Cookie button
To remove all cookies click on the Remove All Cookies button

Mozilla Firefox

Click on Tools, then Options (or Edit | Preferences on Linux)
Select Privacy
In the Cookies panel, click on Show Cookies
To remove a single cookie click on the entry in the list and click on the Remove Cookie button
To remove all cookies click on the Remove All Cookies button

http://www.aboutcookies.org/page-2