Issue 3880 - Improve behavior of Safari content blocker option

messageResponder.js

Index: messageResponder.js
===================================================================
--- a/messageResponder.js
+++ b/messageResponder.js
@@ -71,6 +71,7 @@
   var changeListeners = new global.ext.PageMap();
   var listenedPreferences = Object.create(null);
   var listenedFilterChanges = Object.create(null);
+  var safariRestartRequired = null;
   var messageTypes = {
     "app": "app.respond",
     "filter": "filters.respond",
@@ -189,6 +190,24 @@
         break;
       case "app.listen":
         getListenerFilters(sender.page).app = message.filter;
+        if (message.filter.indexOf("safariRestartRequired") != -1)
+        {
+          if (safariRestartRequired == null)
+          {
+            safariRestartRequired = false;
+            Prefs.on("safari_contentblocker", function()
+            {
+              safariRestartRequired = !Prefs.safari_contentblocker;
+              sendMessage("app", "safariRestartRequired", safariRestartRequired);
+            });
+          }
+
+          sender.page.sendMessage({
+            type: messageTypes.app,
+            action: "safariRestartRequired",
+            args: [safariRestartRequired]
+          });
+        }
         break;
       case "app.open":
         if (message.what == "options")