See:

• http://kb.mozillazine.org/Images_or_animations_do_not_load

• You can see the permissions for the domain in the current tab in Tools > Page Info > Permissions
• You can check the exceptions in Tools > Options > Content: Load Images > Exceptions
• You can check the Tools > Page Info > Media tab for blocked images (scroll through all the images)

There are also extensions (Tools > Add-ons > Extensions) that can block images.

You can use these steps to check if images are blocked:

• Open the web page that has the images missing in a browser tab.
• Click the website favicon (How do I tell if my connection to a website is secure?) on the left end of the location bar.

• Click the "More Information" button to open the "Page Info" window with the Security tab selected (also accessible via "Tools > Page Info").
• Go to the Media tab of the "Tools > Page Info" window.

• Select the first image link and scroll down through the list with the Down arrow key.
• If an image in the list is grayed and there is a check-mark in the box "Block Images from..." then remove that mark to unblock the images from that domain.

to solve this problem install the Flash plug - in ... dead easy should be there on auto when you update, but it wasn't ... took me ages to work it out