disable acceptable ads from first run page

lib/ui.js

Index: lib/ui.js
===================================================================
--- a/lib/ui.js
+++ b/lib/ui.js
@@ -716,7 +716,31 @@
     }
     else
     {
-      Services.ww.openWindow(null, "chrome://adblockplus/content/ui/filters.xul", "_blank", "chrome,centerscreen,resizable,dialog=no", {wrappedJSObject: filter});
+      let {application} = require("info");
+      if (application == "fennec2")
+      {
+        Cu.import("resource://gre/modules/Prompt.jsm");
+        let hasAcceptableAds = FilterStorage.subscriptions.some(function(subscription) subscription instanceof DownloadableSubscription && subscription.url == Prefs.subscriptions_exceptionsurl);
+        let promtSettings =
+        {
+          title: Utils.getString("disable_aa_promt_title"),
+          message: Utils.getString("disable_aa_promt_msg_already")
+        };
+        
+        if (hasAcceptableAds)
+        {
+          promtSettings["buttons"] = [Utils.getString("disable_aa_promt_ok"), Utils.getString("disable_aa_promt_cancel")];
+          promtSettings["message"] = Utils.getString("disable_aa_promt_msg");
+        }
+        
+        new Prompt(promtSettings).show(function(data) 
+        {
+          if (data.button == 0)
+            UI.toggleAcceptableAds();
+        });
+      }
+      else
+        Services.ww.openWindow(null, "chrome://adblockplus/content/ui/filters.xul", "_blank", "chrome,centerscreen,resizable,dialog=no", {wrappedJSObject: filter});
     }
   },