Please update to the current Firefox 24 release. *Help > About Firefox *https://support.mozilla.org/kb/update-firefox-latest-version. *https://support.mozilla.org/kb/Updating+Firefox The Firefox 12 version that you currently run is no longer supported with security updates. *It is important to update Firefox and add-ons to the latest version to get all security fixes. ----- Do you have a problem with the connection (proxy)? Check the connection settings. *Tools > Options > Advanced > Network : Connection > Settings *https://support.mozilla.org/kb/Options+window+-+Advanced+panel If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly. See "Firefox connection settings": *https://support.mozilla.org/kb/Firefox+cannot+load+websites+but+other+programs+can