Issues have been previously linked to the McAfee Site Advisor extension. Try to disable it and see if the problem persists. http://service.mcafee.com/faqdocument.aspx?id=TS100162 How to uninstall SiteAdvisor To disable it: Type "about:addons" in the Location bar Find the extension and click on its "Disable" button ----------------- If you log out of any site, you must log back in. If you are not logging out yourself, then the browser (or disk cleaner or . . .) is removing the cookies that have your login data. Check your anti-virus and disk cleaners and tell them to leave the browsers alone. ---------------- Type '''about:preferences#privacy'''<enter> in the address bar. Under '''History,''' select '''Use Custom Settings.''' Turn on '''Clear history when Firefox closes.''' To its right, press the '''Settings''' button. Make sure '''Active Logins''' is off.