Clear the cache

1. Click the menu button  and choose Preferences.
2. Select the Privacy & Security panel.
3. In the Cookies and Site Data section, click Clear Data.

   

4. Remove the check mark in front of Cookies and Site Data.
5. With Cached Web Content check marked, click the Clear button.
6. Close the about:preferences page. Any changes you've made will automatically be saved.

Automatically clear the cache

You can set Firefox to automatically clear the cache when Firefox closes:

1. Click the menu button  and choose Preferences.
2. Select the Privacy & Security panel.
3. In the History section, set Firefox will to Use custom settings for history.
4. Select the check box for Clear history when Firefox closes.
5. Beside Clear history when Firefox closes, click the Settings… button. The Settings for Clearing History window will open.
6. In the Settings for Clearing History window, put a check mark next to Cache.

   

   
   

7. Click OK to close the Settings for Clearing History window.
8. Close the about:preferences page. Any changes you've made will automatically be saved.