diff --git a/b2g/chrome/content/devtools.js b/b2g/chrome/content/devtools.js
index 5cdc449f6013..d917ec00f53e 100644
--- a/b2g/chrome/content/devtools.js
+++ b/b2g/chrome/content/devtools.js
@@ -69,8 +69,12 @@ let devtoolsWidgetPanel = {
         Services.obs.addObserver(this, 'in-process-browser-or-app-frame-shown', false);
         Services.obs.addObserver(this, 'message-manager-disconnect', false);
 
-        let systemapp = document.querySelector('#systemapp').contentWindow;
-        let frames = systemapp.document.querySelectorAll('iframe[mozapp]');
+        let systemapp = document.querySelector('#systemapp');
+        let manifestURL = systemapp.getAttribute("mozapp");
+        this.trackApp(manifestURL);
+
+        let frames =
+          systemapp.contentWindow.document.querySelectorAll('iframe[mozapp]');
         for (let frame of frames) {
           let manifestURL = frame.getAttribute("mozapp");
           this.trackApp(manifestURL);