If images are missing then check that you aren't blocking images from some domains. See: * http://kb.mozillazine.org/Images_or_animations_do_not_load * Check the permissions for the domain in the current tab in Tools > Page Info > Permissions * Check that images are enabled: Firefox > Preferences > Content: [X] Load images automatically * Check the exceptions in Firefox > Preferences > Content: Load Images > Exceptions * Check the "Tools > Page Info > Media" tab for blocked images (scroll through all the images) There are also extensions (Tools > Add-ons > Extensions) and security software (firewall, anti-virus) that can block images. * https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes