1 files changed, 10 insertions, 7 deletions
diff --git a/chrome/common/extensions/docs/examples/api/messaging/timer/page.js b/chrome/common/extensions/docs/examples/api/messaging/timer/page.js
index 8d0178f..4914aab 100644
--- a/chrome/common/extensions/docs/examples/api/messaging/timer/page.js
+++ b/chrome/common/extensions/docs/examples/api/messaging/timer/page.js
@@ -1,9 +1,12 @@
-chrome.extension.onConnect.addListener(function(port) {
-  port.onMessage.addListener(function(msg) {
-    port.postMessage({counter: msg.counter+1});
+if (window == top) {
+  chrome.extension.onConnect.addListener(function(port) {
+    port.onMessage.addListener(function(msg) {
+      port.postMessage({counter: msg.counter+1});
+    });
   });
-});
 
-chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
-  sendResponse({counter: request.counter+1});
-});
+  chrome.extension.onRequest.addListener(
+    function(request, sender, sendResponse) {
+      sendResponse({counter: request.counter+1});
+    });
+}