diff --git a/spec/fixtures/graphs/Clock.json b/spec/fixtures/graphs/Clock.json
index a592275..c6b4d9f 100644
--- a/spec/fixtures/graphs/Clock.json
+++ b/spec/fixtures/graphs/Clock.json
@@ -1,7 +1,7 @@
 {
   "properties": {
     "environment": {
-      "runtime": "noflo-browser",
+      "type": "noflo-browser",
       "content": "<div class='area' title='.area'>\n  <img id='clock' src='https://i.imgur.com/0S7R8OU.png' style='position:absolute; width:300px; height:300px; top:0; left:0;' />\n  <img id='hours' src='https://i.imgur.com/Fw8L3L1.png' style='position:absolute; top:50px; left:130px; height:200px;' />\n  <img id='minutes' src='https://i.imgur.com/WtSz99Q.png' style='position:absolute; top:0; left:140px; height:300px;' />\n  <img id='seconds' src='https://i.imgur.com/m2PQs6E.png' style='position:absolute; top:0; left:145px; height:300px;' />\n</div>",
       "width": 300,
       "height": 300,
diff --git a/spec/fixtures/package.json b/spec/fixtures/package.json
index beb6073..f1da3d7 100644
--- a/spec/fixtures/package.json
+++ b/spec/fixtures/package.json
@@ -21,8 +21,7 @@
     "noflo-css": "^0.0.2"
   },
   "devDependencies": {
-    "noflo-runtime-iframe": "^0.8.0",
-    "noflo-runtime-webrtc": "^0.8.0"
+    "noflo-runtime-postmessage": "^0.8.0"
   },
   "keywords": [
     "noflo"
diff --git a/tasks/noflo_browser.js b/tasks/noflo_browser.js
index def3555..2b180a0 100644
--- a/tasks/noflo_browser.js
+++ b/tasks/noflo_browser.js
@@ -72,11 +72,8 @@ module.exports = function(grunt) {
       signalserver: 'https://api.flowhub.io'
     });
 
-    if (options.debug && !options.exposed_modules['noflo-runtime-webrtc']) {
-      options.exposed_modules['noflo-runtime-webrtc'] = 'noflo-runtime-webrtc';
-    }
-    if (options.debug && !options.exposed_modules['noflo-runtime-iframe']) {
-      options.exposed_modules['noflo-runtime-iframe'] = 'noflo-runtime-iframe';
+    if (options.debug && !options.exposed_modules['noflo-runtime-postmessage']) {
+      options.exposed_modules['noflo-runtime-postmessage'] = 'noflo-runtime-postmessage';
     }
 
     // Force task to async mode
diff --git a/templates/graphDebug.html b/templates/graphDebug.html
index 7d88af8..ded122e 100644
--- a/templates/graphDebug.html
+++ b/templates/graphDebug.html
@@ -4,7 +4,6 @@
     <meta charset="utf-8">
     <title><%= name %></title><% _.forEach(scripts, function (path) { %>
     <script src="<%= path %>"></script><% }); %>
-    <script src="https://app.flowhub.io/node_modules/rtc/dist/rtc.js"></script>
     <script src="<%= noflo %>"></script>
     <style>
     #flowhub_debug_url.nodebug {
@@ -53,7 +52,6 @@
           var graph = instance.network.graph;
 
           var queryProtocol = getParameterByName('fbp_protocol');
-          var queryAddress = getParameterByName('fbp_address');
           var queryNoLoad = getParameterByName('fbp_noload');
 
           var runtimeOptions = {
@@ -71,29 +69,20 @@
             runtimeOptions.defaultGraph = graph;
           };
           if (!queryProtocol) {
-              queryProtocol = 'webrtc';
+            queryProtocol = 'opener';
           }
 
           var rt = null;
-          if (queryProtocol == 'webrtc') {
-            var webrtcRuntime = require('noflo-runtime-webrtc');
-            if (queryAddress) {
-              // ID to use specified from outside, normally by Flowhub IDE
-              rt = webrtcRuntime(queryAddress, runtimeOptions, true);
-            } else {
-              // Generate new ID
-              rt = webrtcRuntime(null, runtimeOptions, true);
-              rt.signaller = '<%= signalServer %>';
-            }
+          var postMessageRuntime = require('noflo-runtime-postmessage');
+          if (queryProtocol == 'opener') {
             var ide = '<%= ideUrl %>';
-            var debugUrl = ide+'#runtime/endpoint?'+encodeURIComponent('protocol=webrtc&address='+rt.signaller+'#'+rt.id);
+            var debugUrl = ide+'#runtime/endpoint?'+encodeURIComponent('protocol=opener&address='+window.location.href);
             var debugButton = document.getElementById('flowhub_debug_url');
-            console.log('Debug URL', debugUrl);
             debugButton.className = "debug";
             debugButton.href = debugUrl;
+            rt = postMessageRuntime.opener(runtimeOptions, debugButton);
           } else if (queryProtocol == 'iframe') {
-            var iframeRuntime = require('noflo-runtime-iframe');
-            rt = iframeRuntime(runtimeOptions);
+            rt = postMessageRuntime.iframe(runtimeOptions);
           }
 
           if (rt) {