Clear the cache and the cookies from sites that cause problems. "Clear the Cache": * Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now" "Remove Cookies" from sites causing problems: * Tools > Options > Privacy > Cookies: "Show Cookies" ---- * https://support.mozilla.com/kb/Cookies * https://support.mozilla.com/kb/Enabling+and+disabling+cookies ---- Also check the date and time in the clock on your computer: (double) click the clock icon on the Windows Taskbar.