Your User Agent show that you have Ask Toolbar installed. This extension has been reported as causing various malfunctioning problems in Firefox. So Uninstall it. Uninstalling Add-ons * https://support.mozilla.com/en-US/kb/Uninstalling%20add-ons Cannot Uninstall an Add-on * https://support.mozilla.com/en-US/kb/Cannot%20uninstall%20an%20add-on After that, see this - Troubleshooting extensions and themes * https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Websites look wrong * https://support.mozilla.com/en-US/kb/Websites%20look%20wrong Problems using Facebook in Firefox * https://support.mozilla.com/en-US/kb/Problems%20using%20Facebook%20in%20Firefox Check and tell if its working.