I just found out how to disable the FB's new photo viewer mode. It's called Theater mode.
Here's short post you can refer to:http://www.geekzu.com/facebook-theater-mode/
It was one of the worst things they have done on FB recently.I mousewheel click the image to open it in a new tab to get it to display on its own.
Can't agree more. I'm on my search right now looking for a permanent fix for that problem!