Facebook’s new lightbox photo viewer is quite irritating. It certainly saves time, but its altogether a different viewing experience and users like me who are used to the earlier version of viewing photos will definitely find the lightbox viewer irritating and useless.
Facebook doesn’t allow users to disable this feature and allow users to revert back to the earlier version. However, there are ways by which you can disable the lightbox viewer.
The easiest and probably the quickest way to overcome this viewer is to refresh your page by pressing F5 (or the refresh button in the browser). Refreshing the page will allow you to view photos in the old style. This is effective until you switch to another album.
Switching to another album will bring back the lightbox again. To avoid refreshing your page for every album and to permanently disable the lightbox feature, you can install the available browser extensions.
Alternatively, removing &type=1&theater from the address bar and pressing enter will close the lightbox. However, this method worked only in Google Chrome for me.