Don't pause WebMs with audio when off screen.

src/General/lib/$.coffee

@@ -296,6 +296,9 @@ $.minmax = (value, min, max) ->
         value
     )
 
+$.hasAudio = (video) ->
+  video.mozHasAudio or !!video.webkitAudioDecodedByteCount
+
 $.item = (key, val) ->
   item = {}
   item[key] = val

src/Images/ImageExpand.coffee

@@ -76,6 +76,7 @@ ImageExpand =
       g.posts.forEach (post) ->
         for post in [post, post.clones...] when post.file and post.file.isVideo and post.file.isExpanded
           video = post.file.fullImage
+          continue if $.hasAudio video
           visible = Header.isNodeVisible video
           if visible and post.file.wasPlaying
             delete post.file.wasPlaying

src/Posting/QR.coffee

@@ -404,7 +404,7 @@ QR =
         else if duration > QR.max_duration_video
           QR.error "#{file.name}: Video too long (video: #{duration}s, max: #{QR.max_duration_video}s)"
           pass = false
-        if g.BOARD.ID not in ['gif', 'wsg'] and (video.mozHasAudio or video.webkitAudioDecodedByteCount)
+        if g.BOARD.ID not in ['gif', 'wsg'] and $.hasAudio video
           QR.error "#{file.name}: Audio not allowed"
           pass = false
         cb pass, video