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.

You can manage the permissions for the domain in the current tab by going to Page Info > Permissions.
You can access Page Info via the right-click context menu on a web page and via the Tools menu.

You can inspect and manage the permissions for all domains on the about:permissions page via the location bar.

• http://kb.mozillazine.org/Images_or_animations_do_not_load
• https://support.mozilla.com/kb/Images+or+animations+do+not+show

Thank you for your reply.

I followed the instructions implicitly and could find nothing amiss. I followed the directions at "https://support.mozilla.com/en-US/kb/Images or animations do not show" and disabled the security software. RealPlayer is not installed.

The problem images remain blacked out.

The issue also occurs with certain images I personally upload to Facebook.

Installing the latest version of the Flash Player appeared to solve all instances of the problem. Thank you for your help.

posting my problem in a seperate thread as it is not quite related to this current thread