Go to Firefox > Preferences > Content. Beside "Load images automatically", click on Exceptions. If Facebook appears in the list, select it, and click Remove Site.

It is possible that you do not recognize the server that Facebook is using to store the images.

Another way to see which images are blocked is to click the favicon (Site Identification icon) on the left side of the location bar and click the "More Information" button.
This will open the Security tab of the Page Info window (also accessible via Tools > Page Info).
Go to the Media tab of that Page Info window.
Select the first image and scroll down though the list with the Down arrow.
If an image link is grayed and there is a check-mark in the box Block Images from... just above the "Media Preview" area then remove that mark to unblock the images from that domain.

I'm running Vista and I can't display some Facebook images and enlarge no images in Firefox. I can go to Explorer and view them fine. I have tried Tools/Options/Exceptions. The only real cure that I've found is to use Internet Explorer every time I want to use Facebook.

Hi I've been trying for weeks to restore my photos, but to no avail, thank you so much it was simple and effective. Thank you Have a wonderful day