If images are missing then check that you aren't blocking images from some domains. *Check the permissions for the domain in the current tab in "Tools > Page Info > Permissions" *Check that images are enabled: Tools > Options > Content: [X] Load images automatically *Check the exceptions in "Tools > Options > Content: Load Images > Exceptions" *Check the "Tools > Page Info > Media" tab for blocked images (scroll through all the images with the cursor Down key). If an image in the list is grayed and there is a check-mark in the box "<i>Block Images from...</i>" then remove that mark to unblock the images from that domain. Make sure that you do not block third-party images, the permissions.default.images pref should be 1. *http://kb.mozillazine.org/Images_or_animations_do_not_load *http://kb.mozillazine.org/about:config There are also extensions (Tools > Add-ons > Extensions) and security software (firewall, anti-virus) that can block images. *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes