diff --git a/dom/workers/test/mochitest.ini b/dom/workers/test/mochitest.ini
index 9dc5dba75df3..daaed889a151 100644
--- a/dom/workers/test/mochitest.ini
+++ b/dom/workers/test/mochitest.ini
@@ -117,6 +117,8 @@ support-files =
   sharedWorker_ports.js
   sharedWorker_lifetime.js
   worker_referrer.js
+  websocket_https.html
+  websocket_https_worker.js
 
 [test_404.html]
 [test_atob.html]
@@ -210,6 +212,8 @@ skip-if = (toolkit == 'gonk' && debug) # Bug 1176223
 skip-if = buildapp == 'b2g' || toolkit == 'android' #bug 982828
 [test_websocket_basic.html]
 skip-if = buildapp == 'b2g' || toolkit == 'android' #bug 982828
+[test_websocket_https.html]
+skip-if = buildapp == 'b2g' # no https on b2g
 [test_websocket_loadgroup.html]
 skip-if = buildapp == 'b2g' || toolkit == 'android' #bug 982828
 [test_webSocket_sharedWorker.html]
diff --git a/dom/workers/test/test_websocket_https.html b/dom/workers/test/test_websocket_https.html
new file mode 100644
index 000000000000..aa94141fd46d
--- /dev/null
+++ b/dom/workers/test/test_websocket_https.html
@@ -0,0 +1,30 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test that creating insecure websockets from https workers is not possible</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" language="javascript">
+
+  onmessage = function(event) {
+    is(event.data, "not created", "WebSocket object must not be created");
+    SimpleTest.finish();
+  };
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+<iframe src="https://example.com/tests/dom/workers/test/websocket_https.html"></iframe>
+</body>
+</html>
diff --git a/dom/workers/test/websocket_https.html b/dom/workers/test/websocket_https.html
new file mode 100644
index 000000000000..549147a33279
--- /dev/null
+++ b/dom/workers/test/websocket_https.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<script>
+  var worker = new Worker("https://example.com/tests/dom/workers/test/websocket_https_worker.js");
+
+  worker.onmessage = function(event) {
+    parent.postMessage(event.data, "*");
+  };
+
+  worker.onerror = function(event) {
+    parent.postMessage("error", "*");
+  };
+
+  worker.postMessage("start");
+</script>
diff --git a/dom/workers/test/websocket_https_worker.js b/dom/workers/test/websocket_https_worker.js
new file mode 100644
index 000000000000..2592ed6d0d11
--- /dev/null
+++ b/dom/workers/test/websocket_https_worker.js
@@ -0,0 +1,9 @@
+onmessage = function() {
+  var wsCreated = true;
+  try {
+    new WebSocket("ws://mochi.test:8888/tests/dom/base/test/file_websocket_hello");
+  } catch(e) {
+    wsCreated = false;
+  }
+  postMessage(wsCreated ? "created" : "not created");
+};
