Add $.queueTask.

4chan_x.user.js

@@ -480,6 +480,30 @@
     open: function(url) {
       return (GM_openInTab || window.open)(url, '_blank');
     },
+    queueTask: (function() {
+      var execTask, taskChannel, taskQueue;
+      taskQueue = [];
+      execTask = function() {
+        var args, func, task;
+        task = taskQueue.shift();
+        func = task[0];
+        args = Array.prototype.slice.call(task, 1);
+        return func.apply(func, args);
+      };
+      if (window.MessageChannel) {
+        taskChannel = new MessageChannel();
+        taskChannel.port1.onmessage = execTask;
+        return function() {
+          taskQueue.push(arguments);
+          return taskChannel.port2.postMessage(null);
+        };
+      } else {
+        return function() {
+          taskQueue.push(arguments);
+          return setTimeout(execTask, 0);
+        };
+      }
+    })(),
     globalEval: function(code) {
       var script;
       script = $.el('script', {
@@ -489,9 +513,10 @@
       return $.rm(script);
     },
     unsafeWindow: window.opera && window || unsafeWindow || (function() {
-      d.createElement('p');
+      var p;
+      p = d.createElement('p');
       p.setAttribute('onclick', 'return window');
-      return el.onclick();
+      return p.onclick();
     })(),
     shortenFilename: function(filename, isOP) {
       var threshold;

script.coffee

@@ -366,6 +366,26 @@ $.extend $,
     return
   open: (url) ->
     (GM_openInTab or window.open) url, '_blank'
+  queueTask:
+    # inspired by https://www.w3.org/Bugs/Public/show_bug.cgi?id=15007
+    (->
+      taskQueue = []
+      execTask = ->
+        task = taskQueue.shift()
+        func = task[0]
+        args = Array::slice.call task, 1
+        func.apply func, args
+      if window.MessageChannel
+        taskChannel = new MessageChannel()
+        taskChannel.port1.onmessage = execTask
+        ->
+          taskQueue.push arguments
+          taskChannel.port2.postMessage null
+      else # XXX Firefox
+        ->
+          taskQueue.push arguments
+          setTimeout execTask, 0
+    )()
   globalEval: (code) ->
     script = $.el 'script',
       textContent: code
@@ -373,9 +393,9 @@ $.extend $,
     $.rm script
   # http://mths.be/unsafewindow
   unsafeWindow: window.opera and window or unsafeWindow or (->
-    d.createElement 'p'
+    p = d.createElement 'p'
     p.setAttribute 'onclick', 'return window'
-    el.onclick()
+    p.onclick()
   )()
   shortenFilename: (filename, isOP) ->
     # FILENAME SHORTENING SCIENCE: