diff --git a/lib/loader.js b/lib/loader.js
index 972fa8f..38404c0 100644
--- a/lib/loader.js
+++ b/lib/loader.js
@@ -42,10 +42,18 @@ function importLib(file) {
   }
 }());
 
+var navigator = {
+  get mozTCPSocket() {
+    delete navigator.mozTCPSocket;
+    return navigator.mozTCPSocket = window.TCPSocket;
+  }
+};
+
 var window = this.window = {
   xpcDump: dump,
   xpcComponents: Components,
   xpcArgv: args,
+  navigator: navigator,
 
   get XMLHttpRequest() {
     var comp = Components.Constructor(
diff --git a/test/tcp-socket-test.js b/test/tcp-socket-test.js
index 6a34947..429e451 100644
--- a/test/tcp-socket-test.js
+++ b/test/tcp-socket-test.js
@@ -7,6 +7,8 @@ describe('tcp socket', function() {
     it('should work under xpcom', function(done) {
       this.timeout(5000);
 
+			expect(window.navigator.mozTCPSocket).to.be.ok();
+
       subject = window.TCPSocket.open('localhost', 80, {
         verifyCert: false
       });