Try to exclude the cookies to see if that helps. Let all cookies expire when you close Firefox. *Firefox/Tools > Options > Privacy > Cookies: Keep until: I close Firefox Create an Allow exception for cookies that you want to keep. *Firefox/Tools > Options > Privacy > Cookies: Exceptions Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords. Clearing cookies will remove all specified (selected) cookies including cookies that have an allow exception and cookies from plugins.