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diff --git a/dom/security/test/csp/test_frameancestors_userpass.html b/dom/security/test/csp/test_frameancestors_userpass.html
new file mode 100644
index 0000000000..332318fe17
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+++ b/dom/security/test/csp/test_frameancestors_userpass.html
@@ -0,0 +1,148 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Userpass in Frame Ancestors directive</title>
+  <script 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>
+<iframe style="width:100%;height:300px;" id='cspframe'></iframe>
+<script class="testbody" type="text/javascript">
+
+// These are test results: -1 means it hasn't run,
+// true/false is the pass/fail result.
+var framesThatShouldLoad = {
+  frame_a: -1,    /* frame a allowed */
+  frame_b: -1,    /* frame b allowed */
+};
+
+// Number of tests that pass for this file should be 1
+var expectedViolationsLeft = 1;
+
+// CSP frame-ancestor checks happen in the parent, hence we have to
+// proxy the csp violation notifications.
+SpecialPowers.registerObservers("csp-on-violate-policy");
+
+// This is used to watch the blocked data bounce off CSP and allowed data
+// get sent out to the wire.
+function examiner() {
+  SpecialPowers.addObserver(this, "specialpowers-csp-on-violate-policy");
+}
+examiner.prototype  = {
+  observe(subject, topic, data) {
+    // subject should be an nsURI... though could be null since CSP
+    // prohibits cross-origin URI reporting during frame ancestors checks.
+    if (subject && !SpecialPowers.can_QI(subject))
+      return;
+
+    var asciiSpec = subject;
+
+    try {
+      asciiSpec = SpecialPowers.getPrivilegedProps(
+                    SpecialPowers.do_QueryInterface(subject, "nsIURI"),
+                    "asciiSpec");
+
+      // skip checks on the test harness -- can't do this skipping for
+      // cross-origin blocking since the observer doesn't get the URI.  This
+      // can cause this test to over-succeed (but only in specific cases).
+      if (asciiSpec.includes("test_frameancestors_userpass.html")) {
+        return;
+      }
+    } catch (ex) {
+      // was not an nsIURI, so it was probably a cross-origin report.
+    }
+
+    if (topic === "specialpowers-csp-on-violate-policy") {
+      //these were blocked... record that they were blocked
+      window.frameBlocked(asciiSpec, data);
+    }
+  },
+
+  // must eventually call this to remove the listener,
+  // or mochitests might get borked.
+  remove() {
+    SpecialPowers.removeObserver(this, "specialpowers-csp-on-violate-policy");
+  }
+}
+
+// called when a frame is loaded
+// -- if it's not enumerated above, it should not load!
+var frameLoaded = function(testname, uri) {
+  //test already complete.... forget it... remember the first result.
+  if (window.framesThatShouldLoad[testname] != -1)
+    return;
+
+  if (typeof window.framesThatShouldLoad[testname] === 'undefined') {
+    // uh-oh, we're not expecting this frame to load!
+    ok(false, testname + ' framed site should not have loaded: ' + uri);
+  } else {
+    //Check if @ symbol is there in URI.
+    if (uri.includes('@')) {
+      ok(false, ' URI contains userpass. Fetched URI is ' + uri);
+    } else {
+      framesThatShouldLoad[testname] = true;
+      ok(true, ' URI doesn\'t contain userpass. Fetched URI is ' + uri);
+    }
+  }
+  checkTestResults();
+}
+
+// called when a frame is blocked
+// -- we can't determine *which* frame was blocked, but at least we can count them
+var frameBlocked = function(uri, policy) {
+
+  //Check if @ symbol is there in URI or in csp policy.
+  // Bug 1557712: Intermittent failure -> not sure why the 'uri' might ever
+  // be non existing at this point, however if there is no uri, there can
+  // also be no userpass!
+  if (policy.includes('@') ||
+      (typeof uri === 'string' && uri.includes('@'))) {
+    ok(false, ' a CSP policy blocked frame from being loaded. But contains' +
+      ' userpass. Policy is: ' + policy + ';URI is: ' + uri );
+  } else {
+    ok(true, ' a CSP policy blocked frame from being loaded. Doesn\'t contain'+
+      ' userpass. Policy is: ' + policy + ';URI is: ' + uri );
+  }
+  expectedViolationsLeft--;
+  checkTestResults();
+}
+
+
+// Check to see if all the tests have run
+var checkTestResults = function() {
+  // if any test is incomplete, keep waiting
+  for (var v in framesThatShouldLoad)
+    if(window.framesThatShouldLoad[v] == -1)
+      return;
+
+  if (window.expectedViolationsLeft > 0)
+    return;
+
+  // ... otherwise, finish
+  window.examiner.remove();
+  SimpleTest.finish();
+}
+
+window.addEventListener("message", receiveMessage);
+
+function receiveMessage(event) {
+  if (event.data.call && event.data.call == 'frameLoaded')
+    frameLoaded(event.data.testname, event.data.uri);
+}
+
+//////////////////////////////////////////////////////////////////////
+// set up and go
+window.examiner = new examiner();
+SimpleTest.waitForExplicitFinish();
+
+// save this for last so that our listeners are registered.
+// ... this loads the testbed of good and bad requests.
+document.getElementById('cspframe').src = 'file_frameancestors_userpass.html';
+
+</script>
+</pre>
+</body>
+</html>