Clear Cookies and Cache in Firefox
The controls to clear your Cookies, Browsing history, cache and other data in Firefox are all stored in the same screen. To get to these controls and choose what you want to clear, follow these instructions.
These screenshots are taken in Firefox on Windows but the process is identical on Mac and Linux computers.
Click the Firefox menu button
Click the button that looks like three horizontal lines in the top right corner of the Firefox window.
Click the "Library" menu item
In the menu which just appeared, find the Library menu item and click it.
Click the "History" menu item
The interface now shows the contents of the Library menu; one of the items is History. Click it.
Click "Clear Recent History..."
You'll now see the contents of Firefox's browsing history, showing all the sites that you've visited since the last time you cleared your cache.
At the top of the History menu, there will be an option called Clear Recent History.... Click it to get some options about what exactly you will clear from your history and cache.
Choose what to clear
Firefox gives you a very straight-forward interface for clearing your browsing data.
However if you want more control over exactly what you want to clear, click the arrow labelled Details (highlighted by the blue circle in the screenshot below).
Clicking "Details" gives you more options
If you click the arrow next to the Details label, Firefox will give you more details about what you're about to delete.
You then have the chance to delete only the types of data you want to.
Note that in both the default and the Detailed view, you also have the option of choosing the time range to clear. You can clear data from various time periods.
Click "Clear Now"
Once you've selected what you'd like to clear from your internet history (either with the default view or the Detailed view), simply click the Clear Now button and Firefox will delete it.
Congratulations, you have now cleared your selected browsing data from your computer. You can simply close this window and continue to use Firefox.