Firefox 3.5 - 20 (Mac) - Clearing Cache and Cookies
This document explains how to clear the cache and cookies in Mozilla Firefox versions 3.5 through 20. For instructions on clearing the cache and cookies in newer versions of Firefox, please see Firefox 21+ (Mac) - Clearing Cache and Cookies.
Click on Tools > Clear Recent History....
Click on the drop down box to the right of Time range to clear and select Everything. Then, click on Details and check both Cookies and Cache. Click on Clear Now.