Do you mean the images on the Add-ons page itself or that you do not see them applied to Firefox when you hover an Personas image? Previewing a lightweight theme (Persona) only works on sites that are white-listed via an allow exception, so make sure to have an allow exception the addons.mozilla.org domain and possibly the getpersonas.com domain if this domain is still used. You can see the permissions for the domain in the current tab in: * Firefox/Tools > Page Info > Permissions > [X] Install Extensions or Themes * Tools > Options > Security : "Warn me when sites try to install add-ons": Exceptions ---- If images are missing then check that you aren't blocking images from some domains. *Press the F10 key or tap the Alt key to bring up the hidden "Menu Bar" temporarily. *Check the permissions for the domain in the currently selected tab in "Tools > Page Info > Permissions" *Check "Tools > Page Info > Media" for blocked images *Select the first image link and use the cursor Down key to scroll through the list. *If an image in the list is grayed and "<i>Block Images from...</i>" has a check-mark then remove this check-mark to unblock images from this domain. Make sure that you do not block (third-party) images, the permissions.default.image pref on the <b>about:config</b> page should be 1. ---- Make sure that you haven't enabled a High Contrast theme in the Windows/Mac Accessibility settings. Make sure that you allow pages to choose their own colors. *Tools > Options > Content : Fonts & Colors > Colors : [X] "Allow pages to choose their own colors, instead of my selections above" Note that these settings affect background images. See also: *http://kb.mozillazine.org/Website_colors_are_wrong ---- There are extensions like Adblock Plus (Firefox/Tools > Add-ons > Extensions) and security software (firewall, anti-virus) that can block images and other content. See also: *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes *http://kb.mozillazine.org/Images_or_animations_do_not_load *http://kb.mozillazine.org/Websites_look_wrong