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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=911595
+-->
+<head>
+  <title>Test for spinning the event loop inside position handlers</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="geolocation_common.js"></script>
+
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=911595 ">Mozilla Bug 911595</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/*
+ * In bug 911595 , spinning the event loop from inside position
+ * handlers could cause both success and error callbacks to be
+ * fired for the same request if that request has a small timeout.
+ */
+
+SimpleTest.waitForExplicitFinish();
+
+resume_geolocationProvider(function() {
+  force_prompt(true, test1);
+});
+
+var successCallbackCalled = false;
+function successCallback(position) {
+  successCallbackCalled = true;
+  check_geolocation(position);
+  while (!timeoutPassed) {
+    SpecialPowers.spinEventLoop(window);
+  }
+  info("TEST-INFO | successCallback called");
+  check();
+}
+
+var errorCallbackCalled = false;
+function errorCallback(error) {
+  errorCallbackCalled = true;
+  info("TEST-INFO | errorCallback called");
+  check();
+}
+
+function check() {
+  ok(successCallbackCalled != errorCallbackCalled, "Ensure only one callback is called");
+  SimpleTest.finish();
+}
+
+var timeoutPassed = false;
+var timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+function test1() {
+  SpecialPowers.pushPrefEnv({"set": [["geo.provider.network.timeToWaitBeforeSending", 10]]}, function() {
+    navigator.geolocation.getCurrentPosition(successCallback, errorCallback, {timeout: 500});
+    timer.initWithCallback(timer => {
+      timeoutPassed = true;
+    }, 600, Ci.nsITimer.TYPE_ONE_SHOT);
+  });
+}
+</script>
+</pre>
+</body>
+</html>