Exit gallery on fullscreen exit.

src/General/lib/$.coffee

@@ -197,6 +197,12 @@ $.off = (el, events, handler) ->
     el.removeEventListener event, handler, false
   return
 
+$.one = (el, events, handler) ->
+  cb = (e) ->
+    $.off el, events, cb
+    handler.call @, e
+  $.on el, events, cb
+
 $.event = (event, detail, root=d) ->
   <% if (type === 'userscript') { %>
   if detail? and typeof cloneInto is 'function'

src/Images/Gallery.coffee

@@ -79,6 +79,8 @@ Gallery =
         if Header.getTopOf(candidate) + candidate.getBoundingClientRect().height >= 0
           image = candidate
     if Conf['Fullscreen Gallery']
+      $.one d, 'fullscreenchange mozfullscreenchange webkitfullscreenchange', ->
+        $.on d, 'fullscreenchange mozfullscreenchange webkitfullscreenchange', cb.close
       doc.mozRequestFullScreen?()
       doc.webkitRequestFullScreen?(Element.ALLOW_KEYBOARD_INPUT)
     $.addClass doc, 'gallery-open'
@@ -265,6 +267,7 @@ Gallery =
       $.rm Gallery.nodes.el
       $.rmClass doc, 'gallery-open'
       if Conf['Fullscreen Gallery']
+        $.off d, 'fullscreenchange mozfullscreenchange webkitfullscreenchange', Gallery.cb.close
         d.mozCancelFullScreen?()
         d.webkitExitFullscreen?()
       delete Gallery.nodes