diff --git a/client/karma.js b/client/karma.js
index 37e9552e6..8bbb4858b 100644
--- a/client/karma.js
+++ b/client/karma.js
@@ -4,9 +4,10 @@ var util = require('./util');
 
 
 /* jshint unused: false */
-var Karma = function(socket, context, navigator, location) {
+var Karma = function(socket, iframe, opener, navigator, location) {
   var hasError = false;
   var startEmitted = false;
+  var reloadingContext = false;
   var store = {};
   var self = this;
   var queryParams = util.parseQueryParams(location.search);
@@ -20,6 +21,19 @@ var Karma = function(socket, context, navigator, location) {
   this.VERSION = constant.VERSION;
   this.config = {};
 
+  var childWindow = null;
+  var navigateContextTo = function(url) {
+    if (self.config.useIframe === false) {
+      if (childWindow === null || childWindow.closed === true) {
+        // If this is the first time we are opening the window, or the window is closed
+        childWindow = opener('about:blank');
+      }
+      childWindow.location = url;
+    } else {
+      iframe.src = url;
+    }
+  };
+
   this.setupContext = function(contextWindow) {
     if (hasError) {
       return;
@@ -43,7 +57,7 @@ var Karma = function(socket, context, navigator, location) {
     };
 
     contextWindow.onbeforeunload = function(e, b) {
-      if (context.src !== 'about:blank') {
+      if (!reloadingContext) {
         // TODO(vojta): show what test (with explanation about jasmine.UPDATE_INTERVAL)
         contextWindow.__karma__.error('Some of your tests did a full page reload!');
       }
@@ -90,7 +104,8 @@ var Karma = function(socket, context, navigator, location) {
 
 
   var clearContext = function() {
-    context.src = 'about:blank';
+    reloadingContext = true;
+    navigateContextTo('about:blank');
   };
 
   // error during js file loading (most likely syntax error)
@@ -190,8 +205,9 @@ var Karma = function(socket, context, navigator, location) {
     // reset hasError and reload the iframe
     hasError = false;
     startEmitted = false;
+    reloadingContext = false;
     self.config = cfg;
-    context.src = constant.CONTEXT_URL;
+    navigateContextTo(constant.CONTEXT_URL);
 
     // clear the console before run
     // works only on FF (Safari, Chrome do not allow to clear console from js source)
diff --git a/client/main.js b/client/main.js
index 4ac55548c..031ef7f67 100644
--- a/client/main.js
+++ b/client/main.js
@@ -17,5 +17,5 @@ var socket = io.connect('http://' + location.host, {
 
 // instantiate the updater of the view
 new StatusUpdater(socket, util.elm('title'), util.elm('banner'), util.elm('browsers'));
-
-window.karma = new Karma(socket, util.elm('context'), window.navigator, window.location);
+window.karma = new Karma(socket, util.elm('context'), window.open,
+	window.navigator, window.location);
\ No newline at end of file
diff --git a/docs/config/01-configuration-file.md b/docs/config/01-configuration-file.md
index 72de01beb..a95d7d716 100644
--- a/docs/config/01-configuration-file.md
+++ b/docs/config/01-configuration-file.md
@@ -343,6 +343,15 @@ on whether all tests passed or any tests failed.
 is handed off to [socket.io](https://github.com/LearnBoost/Socket.IO/wiki/Configuring-Socket.IO) (which manages the communication
 between browsers and the testing server).
 
+## client.useIframe
+**Type:** Boolean
+
+**Default:** `true`
+
+**Description:** Run the tests inside an iframe or a new window
+
+If true, Karma runs the tests inside an iframe. If false, Karma runs the tests in a new window. Some tests may not run in an iFrame and may need a new window to run.
+
 
 ## urlRoot
 **Type:** String
diff --git a/lib/config.js b/lib/config.js
index 2e6feefcb..8a4509b6f 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -210,7 +210,8 @@ var Config = function() {
   this.transports = ['websocket', 'flashsocket', 'xhr-polling', 'jsonp-polling'];
   this.plugins = ['karma-*'];
   this.client = {
-    args: []
+    args: [],
+    useIframe: true
   };
   this.browserDisconnectTimeout = 2000;
   this.browserDisconnectTolerance = 0;
diff --git a/static/context.html b/static/context.html
index a1d6cb9e6..807448646 100644
--- a/static/context.html
+++ b/static/context.html
@@ -16,7 +16,12 @@
        manner. -->
   <script type="text/javascript">
     // sets window.__karma__ and overrides console and error handling
-    window.parent.karma.setupContext(window);
+    // Use window.opener if this was opened by someone else - in a new window
+    if (window.opener) {
+      window.opener.karma.setupContext(window);
+    } else {
+      window.parent.karma.setupContext(window);
+    }
 
     // All served files with the latest timestamps
     %MAPPINGS%
diff --git a/test/client/karma.spec.js b/test/client/karma.spec.js
index b6c151d25..34559a9d9 100644
--- a/test/client/karma.spec.js
+++ b/test/client/karma.spec.js
@@ -3,7 +3,7 @@ var MockSocket = require('./mocks').Socket;
 
 
 describe('Karma', function() {
-  var socket, k, spyStart, windowNavigator, windowLocation;
+  var socket, k, spyStart, windowNavigator, windowLocation, spywindowOpener;
 
   var setTransportTo = function(transportName) {
     socket._setTransportNameTo(transportName);
@@ -15,19 +15,36 @@ describe('Karma', function() {
     socket = new MockSocket();
     windowNavigator = {};
     windowLocation = {search: ''};
-    k = new Karma(socket, {}, windowNavigator, windowLocation);
+    spywindowOpener = spyOn(window, 'open').andReturn({});
+    k = new Karma(socket, {}, window.open, windowNavigator, windowLocation);
     spyStart = spyOn(k, 'start');
+
   });
 
 
   it('should start execution when all files loaded and pass config', function() {
-    var config = {};
+    var config = {
+      useIframe: true
+    };
+
+    socket.emit('execute', config);
+    expect(spyStart).not.toHaveBeenCalled();
+
+    k.loaded();
+    expect(spyStart).toHaveBeenCalledWith(config);
+  });
+
+  it('should open a new window when useIFrame is false', function() {
+    var config = {
+      useIframe: false
+    };
 
     socket.emit('execute', config);
     expect(spyStart).not.toHaveBeenCalled();
 
     k.loaded();
     expect(spyStart).toHaveBeenCalledWith(config);
+    expect(spywindowOpener).toHaveBeenCalledWith('about:blank');
   });
 
 
@@ -79,7 +96,7 @@ describe('Karma', function() {
   it('should report browser id', function() {
     windowLocation.search = '?id=567';
     socket = new MockSocket();
-    k = new Karma(socket, {}, windowNavigator, windowLocation);
+    k = new Karma(socket, {}, window.open, windowNavigator, windowLocation);
 
     var spyInfo = jasmine.createSpy('onInfo').andCallFake(function(info) {
       expect(info.id).toBe('567');
@@ -232,7 +249,7 @@ describe('Karma', function() {
     it('should navigate the client to return_url if specified', function() {
       windowLocation.search = '?id=567&return_url=http://return.com';
       socket = new MockSocket();
-      k = new Karma(socket, {}, windowNavigator, windowLocation);
+      k = new Karma(socket, {}, window.open, windowNavigator, windowLocation);
 
       spyOn(socket, 'disconnect');