Facebook recently launched their new interface for viewing photos, albums through a lightbox gallery (Theater view ) type photo viewer which loads on clicking any picture on the wall, album.
Or If you uses Chrome Browser then you can permanently disable theater mode by installing a extension form here
( Click on image to Enlarge )
some people like this some don't so if you want to disable lightbox gallery view From browsers, once the lightbox gallery view (theatre mode) pops up simple hit refresh [F5] or open the image link in a new tab. You can also remove &theater at the end of the url in the address bar and press enter to show the old facebook photo viewer.Or If you uses Chrome Browser then you can permanently disable theater mode by installing a extension form here