Clearing Your Cache in FireFox 3
How Do I Clear My Cache?
Open your browser. You don’t have to go to a site as cool as this, but it helps 😉
Hit Control + Shift + Delete to bring up the menu that we want.
In the window that pops up, click the dropdown box at the top and select “Everything” if it is not already selected. Then deselect all the boxes except the ones next to “Browsing and Download History,” “Cookies,” “Cache” and “Active Logins.” Hit “Clear Now.”