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1. Close all open Firefox windows and tabs. Open a new Firefox window.
2. Click the Menu button in the top right
3. Select the "Options" button (Marked by a gear icon) - On Mac the button will say "Preferences" like below
   
   
   
   
4. On the left select the Privacy & Security tab
5. Click "clear your recent history"
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6. A dialogue box will appear, select the items to delete - make sure that "Cache" is selected - and verify that the time range to clear is set to "Everything"
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7. Now click the "Clear Now" button

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