OS Vista Fire-Fox
I have sorted this problem out.
Open Face-book Next click on the site identity button the button is located to the left of the Web address bar (http://facebook.
Click on it and it will open a panel then on more information.
Select Permissions, make sure that "Load Images" is set to allow or selecting Default which I set instead allow.
Secondly select Media, then click on the first item in the list. Use the down arrow key to scroll down the list. If any item has a tick in the box un-tick and save and continue to the end of the list.
This resolved my problem, I found this useful for more info on the identity button.click here.