1. Open Mozilla Firefox.
2. Click the 3-bar menu button (≡) in the top right corner.
3. Click Settings.

4. Click Privacy & Security in the left navigation pane.

5. Scroll down on the Privacy & Security page and look for the History section. Next, click the 'Clear History…' button.

6. Click the drop-down arrow for Time range to clear.

7. Click the time period you want clear. We recommend that you select the 'Everything' option.

8. Tick the boxes of the history type you would like to clear. Make sure that the Cache option is selected. Click the OK button.

Note: You do not need to clear Cookies, but if you choose to do so, please be aware that you will have to sign in again on websites that you were previously logged into.