diff --git a/lib/polyfill.coffee b/lib/polyfill.coffee
index 08ce47683..e09a458b0 100644
--- a/lib/polyfill.coffee
+++ b/lib/polyfill.coffee
@@ -1,21 +1,8 @@
 Polyfill =
   init: ->
     <% if (type === 'crx') { %>
-    @notificationPermission()
     @toBlob()
-    @visibility()
     <% } %>
-  notificationPermission: ->
-    return if !window.Notification or 'permission' of Notification or !window.webkitNotifications
-    Object.defineProperty Notification, 'permission',
-      get: ->
-        switch webkitNotifications.checkPermission()
-          when 0
-            'granted'
-          when 1
-            'default'
-          when 2
-            'denied'
   toBlob: ->
     HTMLCanvasElement::toBlob or= (cb) ->
       data = atob @toDataURL()[22..]
@@ -25,12 +12,3 @@ Polyfill =
       for i in [0...l] by 1
         ui8a[i] = data.charCodeAt i
       cb new Blob [ui8a], type: 'image/png'
-  visibility: ->
-    # page visibility API
-    return if 'visibilityState' of d
-    Object.defineProperties HTMLDocument.prototype,
-      visibilityState:
-        get: -> @webkitVisibilityState
-      hidden:
-        get: -> @webkitHidden
-    $.on d, 'webkitvisibilitychange', -> $.event 'visibilitychange'