If you use firefox and facebook, you may notice (or may not actually) that the navigation buttons and added functionality options by way of “buttons” dont show up. These are the Nav buttons next to the facebook logo for Friend requests, messages and notifications. Then the button for settings on posts on your wall and even the forward and back buttons for the photos.
To get these back, while you have facebook up, just
1. Right click screen
2. go to “view page info”
3. select “media” tab
4. uncheck “block images from static.ak.fbcdn.net”
(Source: A helpful post in the FB forums from M.Delhie)