Clear the cache and remove cookies only from websites that cause problems. "Clear the Cache": *Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now" "Remove Cookies" from sites causing problems: *Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies" You can inspect and manage permissions for the domain in the currently selected tab via these steps: *Click the "[[Site Identity Button|Site Identity Button]]" (globe/padlock) on the location/address bar *Click "More Information" to open "Tools > Page Info" with the Security tab selected *Go to the Permissions tab (Tools > Page Info > Permissions) to check the permissions for the domain in the currently selected tab ---- See also: *https://support.mozilla.org/kb/Deleting+cookies *http://kb.mozillazine.org/Cookies