Facebook has got with the photo viewer which appear in a dark pop-up window. This new layout of photos is live for most Facebook users though it looks a bit ugly and doesn't seem to get with other users.
Switch to the Old Layout of Facebook Photos:
While viewing a photo in Facebook, to switch to the classic layout - where photos are displayed without a pop-up - just press the F5 key on your keyboard.
This will refresh the current Facebook page and displays in Previous Photo Viewer.
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