- Click the Menu button and choose Options:
- Select Advanced.
- Click on Network.
- In the Cached Web Content section, click Clear Now:
- Close the about: preferences. Any changes you've made will automatically be saved.
For more information on how to clear Firefox cache, see https://support.mozilla.org/en-US/kb/how-clear-firefox-cache.
For more information on how to delete cookies on Firefox, see https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored.