Clear the cache
- Click the menu button
and choose Preferences.
- Select the Advanced panel.
- Click on the Network tab.
- In the Cached Web Content section, click Clear Now.
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- 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:
- Click the menu button
and choose Preferences.
- Select the Privacy panel.
- In the History section, set Firefox will: to Use custom settings for history.
- Select the check box for Clear history when Firefox closes.
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- Beside Clear history when Firefox closes, click the Settings… button. The Settings for Clearing History window will open.
- In the Settings for Clearing History window, put a check mark next to Cache.
- For more information on the other preferences, see Delete browsing, search and download history on Firefox.
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- Click OK to close the Settings for Clearing History window.
- Close the about:preferences page. Any changes you've made will automatically be saved.