Issue 1843 - Deactivate "Block element" dialog when extension is disabled/uninstalled/reloaded

chrome/ext/content.js

 chrome.runtime.onMessage.addListener(function(message, sender, sendResponse)
 {
   return ext.onMessage._dispatch(message, {}, sendResponse).indexOf(true) != -1;
 });
+
+ext.onExtensionUnloaded = (function()
+{
+  var port = null;
+
+  return {
+    addListener: function(listener)
+    {
+      if (!port)
+        port = chrome.runtime.connect();
+
+      // When the extension is reloaded, disabled or uninstalled the
+      // background page dies and automatically disconnects all ports
+      port.onDisconnect.addListener(listener);
+    },
+    removeListener: function(listener)
+    {
+      if (port)
+      {
+        port.onDisconnect.removeListener(listener)
+
+        if (!port.onDisconnect.hasListeners())
+        {
+          port.disconnect();
+          port = null;
+        }
+      }
+    }
+  };
+})();