How to Clear Firefox Browsing Cache and Cookies
Here Danny Beales shows you how to quickly clear your Firefox cache and cookies. To clear your Firefox cache, do the following: Go to Tools Clear Private Data Select which data you would like to have cleared, and click on Clear Private Data. Your cookies and/or cache has been cleared. Remember to do this from time to time, because it will help speed up your browser's performance as well as keep harmful cookies from tracking your browsing.
For help on clearing the web cache on other platforms and browsers, see "How to Clear Your Cache on Any Web Browser" for details.