Clear all cookies, site data and cache in Firefox
https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
1Click the menu button and select Options. 2Select the Privacy & Security panel and go to the Cookies and Site Data section. 3 Click the Clear Data…button. The Clear Data dialog will appear. Cookies and Site Data (to remove login status and site preferences) and Cached Web Content (to remove stored images, scripts and other cached content) should both be check marked. 4Click Clear.
1Click the menu button and select Options.
2Select the Privacy & Security panel and go to the Cookies and Site Data section.
3 Click the Clear Data…button. The Clear Data dialog will appear. Cookies and Site Data (to remove login status and site preferences) and Cached Web Content (to remove stored images, scripts and other cached content) should both be check marked.
4Click Clear.
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