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diff --git a/dom/security/test/csp/test_ignore_xfo.html b/dom/security/test/csp/test_ignore_xfo.html
new file mode 100644
index 0000000000..73c0dea44f
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+++ b/dom/security/test/csp/test_ignore_xfo.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1024557: Ignore x-frame-options if CSP with frame-ancestors exists</title>
+  <!-- Including SimpleTest.js so we can use waitForExplicitFinish !-->
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<iframe style="width:100%;" id="csp_testframe"></iframe>
+<iframe style="width:100%;" id="csp_testframe_no_xfo"></iframe>
+<iframe style="width:100%;" id="csp_ro_testframe"></iframe>
+
+<script class="testbody" type="text/javascript">
+
+/*
+ * We load two frames using:
+ *   x-frame-options: deny
+ * where the first frame uses a csp and the second a csp_ro including frame-ancestors.
+ * We make sure that xfo is ignored for regular csp but not for csp_ro.
+ */
+
+SimpleTest.waitForExplicitFinish();
+
+var script = SpecialPowers.loadChromeScript(() => {
+/* eslint-env mozilla/chrome-script */
+  let ignoreCount = 0;
+  function listener(msg) {
+    if(msg.message.includes("Content Security Policy: Ignoring ‘x-frame-options’ because of ‘frame-ancestors’ directive.")) {
+      ignoreCount++;
+      if(ignoreCount == 2) {
+        ok(false, 'The "Content Security Policy: Ignoring ‘x-frame-options’ because of ‘frame-ancestors’ directive." warning should only appear once for the csp_testframe.');
+      }
+    }
+  }
+  Services.console.registerListener(listener);
+
+  addMessageListener("cleanup", () => {
+    Services.console.unregisterListener(listener);
+  });
+});
+
+SimpleTest.registerCleanupFunction(async () => {
+  await script.sendQuery("cleanup");
+});
+
+var testcounter = 0;
+function checkFinished() {
+  testcounter++;
+  if (testcounter < 4) {
+    return;
+  }
+  // remove the listener and we are done.
+  window.examiner.remove();
+  SimpleTest.finish();
+}
+
+// X-Frame-Options checks happen in the parent, hence we have to
+// proxy the xfo violation notifications.
+SpecialPowers.registerObservers("xfo-on-violate-policy");
+
+function examiner() {
+  SpecialPowers.addObserver(this, "specialpowers-xfo-on-violate-policy");
+}
+examiner.prototype  = {
+  observe(subject, topic, data) {
+    var asciiSpec = SpecialPowers.getPrivilegedProps(SpecialPowers.do_QueryInterface(subject, "nsIURI"), "asciiSpec");
+
+    is(asciiSpec, "http://mochi.test:8888/tests/dom/security/test/csp/file_ro_ignore_xfo.html", "correct subject");  
+    ok(topic.endsWith("xfo-on-violate-policy"), "correct topic");
+    is(data, "deny", "correct data");
+    checkFinished();
+  },
+  remove() {
+    SpecialPowers.removeObserver(this, "specialpowers-xfo-on-violate-policy");
+  }
+}
+window.examiner = new examiner();
+
+// 1) test XFO with CSP
+var csp_testframe = document.getElementById("csp_testframe");
+csp_testframe.onload = function() {
+  var msg = csp_testframe.contentDocument.getElementById("cspmessage");
+  is(msg.innerHTML, "Ignoring XFO because of CSP", "Loading frame with with XFO and CSP");
+  checkFinished();
+}
+csp_testframe.onerror = function() {
+  ok(false, "sanity: should not fire onerror for csp_testframe");
+  checkFinished();
+}
+csp_testframe.src = "file_ignore_xfo.html";
+
+// 2) test XFO with CSP_RO
+var csp_ro_testframe = document.getElementById("csp_ro_testframe");
+// If XFO denies framing then the onload event should fire.
+csp_ro_testframe.onload = function() {
+  ok(true, "sanity: should fire onload for csp_ro_testframe");
+  checkFinished();
+}
+csp_ro_testframe.onerror = function() {
+  ok(false, "sanity: should not fire onerror for csp_ro_testframe");
+  checkFinished();
+}
+csp_ro_testframe.src = "file_ro_ignore_xfo.html";
+
+var csp_testframe_no_xfo = document.getElementById("csp_testframe_no_xfo");
+csp_testframe_no_xfo.onload = function() {
+  var msg = csp_testframe_no_xfo.contentDocument.getElementById("cspmessage");
+  is(msg.innerHTML, "Do not log xfo ignore warning when no xfo is set.", "Loading frame with with no XFO and CSP");
+  checkFinished();
+}
+csp_testframe_no_xfo.onerror = function() {
+  ok(false, "sanity: should not fire onerror for csp_testframe_no_xfo");
+  checkFinished();
+}
+csp_testframe_no_xfo.src = "file_no_log_ignore_xfo.html";
+
+</script>
+</body>
+</html>