diff --git a/4chan_x.user.js b/4chan_x.user.js
index 095b903af..4d3b4036b 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -1807,7 +1807,7 @@
         if (QR.spoiler) {
           $('label', this.el).hidden = false;
         }
-        if (file.type === 'application/pdf') {
+        if (!/^image/.test(file.type)) {
           this.el.style.backgroundImage = null;
           return;
         }
@@ -2074,6 +2074,8 @@
             return 'image/jpeg';
           case 'pdf':
             return 'application/pdf';
+          case 'swf':
+            return 'application/x-shockwave-flash';
           default:
             return "image/" + type;
         }
diff --git a/script.coffee b/script.coffee
index 0a29a954e..eaf950afb 100644
--- a/script.coffee
+++ b/script.coffee
@@ -1351,7 +1351,7 @@ QR =
     setFile: (@file) ->
       @el.title = "#{file.name} (#{$.bytesToString file.size})"
       $('label', @el).hidden = false if QR.spoiler
-      if file.type is 'application/pdf'
+      unless /^image/.test file.type
         @el.style.backgroundImage = null
         return
       url = window.URL or window.webkitURL
@@ -1475,8 +1475,8 @@ QR =
       $.after $('.captchaimg', QR.el), $.el 'div',
         className: 'captchainput'
         innerHTML: '<input title=Verification class=field autocomplete=off size=1>'
-      @img       = $ '.captchaimg > img', QR.el
-      @input     = $ '.captchainput > input', QR.el
+      @img   = $ '.captchaimg > img', QR.el
+      @input = $ '.captchainput > input', QR.el
       $.on @img.parentNode, 'click',              @reload
       $.on @input,          'keydown',            @keydown
       $.on @challenge,      'DOMNodeInserted', => @load()
@@ -1556,6 +1556,8 @@ QR =
           'image/jpeg'
         when 'pdf'
           'application/pdf'
+        when 'swf'
+          'application/x-shockwave-flash'
         else
           "image/#{type}"
     QR.mimeTypes = mimeTypes.split ', '
@@ -2547,7 +2549,6 @@ Get =
       ]
     {capcode} = data
     if capcode isnt 'N' # 'A'dmin or 'M'od
-      # XXX not sure if this is correct for mods
       $.addClass br.parentNode, if capcode is 'A' then 'capcodeAdmin' else 'capcodeMod'
       $.before br, [
         $.tn(' '),