Check to see if Javascript is enabled.<br> # Go to <code>about:config</code> # Click the button that says you'll be careful # Search for <b>javascript.enabled</b> and see if it is set to <code>true</code> # If it isn't, right click it and click <code>Toggle</code> ---- 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 ---- If you use extensions (Firefox/Tools > Add-ons > Extensions) that can block content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions aren't blocking content. ---- You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files. *Hold down the Shift key and left-click the Reload button *Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux) *Press "Command + Shift + R" (Mac)