Fix occasional twitter.js crash due to it loading too early

Resources/Scripts/twitter.js

@@ -1,7 +1,13 @@
-//
-// Block: Inject custom CSS and layout into the page.
-//
-setTimeout(function(){
+(function(){
+  //
+  // Function: Inject custom CSS into the page.
+  //
+  var injectCSS = function(){
+    if (!document.head){
+      setTimeout(injectCSS, 25);
+      return;
+    }
+    
     var style = document.createElement("style");
     document.head.appendChild(style);
 
@@ -22,4 +28,7 @@ setTimeout(function(){
       style.sheet.insertRule(".btn.cancel { border: 1px solid #bbc1c5 !important; }", 0); // add border to cancel button
       style.sheet.insertRule(".aside p { display: none; }", 0); // hide text below the logout dialog
     }
-}, 1);
+  };
+  
+  setTimeout(injectCSS, 1);
+})();