Start the Mozilla Firefox program (if not open).
Click on TOOLS on the menu bar, then click on OPTIONS, see fig 1.1 below:
You will then see the Firefox Options dialogue box, click on the PRIVACY icon (labeled A in fig 1.2) and you will be presented with the Firefox Privacy settings (fig 1.2) below.
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You can change the amount of days that Firefox will remember your browsing history, alter if required.
To clear your history click the CLEAR BROWSING HISTORY NOW button.
When done, click the OK button (as shown in fig 1.2).