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diff --git a/toolkit/components/url-classifier/tests/mochitest/test_privatebrowsing_trackingprotection.html b/toolkit/components/url-classifier/tests/mochitest/test_privatebrowsing_trackingprotection.html
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@@ -0,0 +1,153 @@
+<!DOCTYPE HTML>
+<!-- Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/ -->
+<html>
+<head>
+  <title>Test Tracking Protection in Private Browsing mode</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+</head>
+
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+
+<script class="testbody" type="text/javascript">
+
+var mainWindow = window.browsingContext.topChromeWindow;
+var contentPage = "https://www.itisatrap.org/chrome/toolkit/components/url-classifier/tests/mochitest/classifiedAnnotatedPBFrame.html";
+
+const {UrlClassifierTestUtils} = ChromeUtils.importESModule(
+  "resource://testing-common/UrlClassifierTestUtils.sys.mjs"
+);
+const {TestUtils} = ChromeUtils.importESModule(
+  "resource://testing-common/TestUtils.sys.mjs"
+);
+
+function testOnWindow(aPrivate) {
+  return new Promise((resolve, reject) => {
+    let win = mainWindow.OpenBrowserWindow({private: aPrivate});
+    win.addEventListener("load", function() {
+      TestUtils.topicObserved("browser-delayed-startup-finished",
+                              subject => subject == win).then(() => {
+        win.addEventListener("DOMContentLoaded", function onInnerLoad() {
+          if (win.content.location.href != contentPage) {
+            win.gBrowser.loadURI(Services.io.newURI(contentPage), {
+              triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal({}),
+            });
+            return;
+          }
+          win.removeEventListener("DOMContentLoaded", onInnerLoad, true);
+
+          win.content.addEventListener("load", function innerLoad2() {
+            win.content.removeEventListener("load", innerLoad2);
+            SimpleTest.executeSoon(function() {
+              resolve(win);
+            });
+          }, false, true);
+        }, true);
+        SimpleTest.executeSoon(function() {
+          win.gBrowser.loadURI(Services.io.newURI(contentPage), {
+            triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal({}),
+          });
+        });
+      });
+    }, {capture: true, once: true});
+  });
+}
+
+var badids = [
+  "badscript",
+  "badimage",
+  "badcss",
+];
+
+function checkLoads(aWindow, aBlocked) {
+  var win = aWindow.content;
+  is(win.document.getElementById("badscript").dataset.touched, aBlocked ? "no" : "yes", "Should not load tracking javascript");
+  is(win.document.getElementById("badimage").dataset.touched, aBlocked ? "no" : "yes", "Should not load tracking images");
+  is(win.document.getElementById("goodscript").dataset.touched, "yes", "Should load entitylisted tracking javascript");
+  is(win.document.getElementById("goodimage").dataset.touched, "yes", "Should load non-blocklisted image");
+
+  var elt = win.document.getElementById("styleCheck");
+  var style = win.document.defaultView.getComputedStyle(elt);
+  isnot(style.visibility, aBlocked ? "hidden" : "", "Should not load tracking css");
+
+  is(win.document.blockedNodeByClassifierCount, aBlocked ? badids.length : 0, "Should identify all tracking elements");
+
+  var blockedNodes = win.document.blockedNodesByClassifier;
+
+  // Make sure that every node in blockedNodes exists in the tree
+  // (that may not always be the case but do not expect any nodes to disappear
+  // from the tree here)
+  var allNodeMatch = true;
+  for (let i = 0; i < blockedNodes.length; i++) {
+    let nodeMatch = false;
+    for (let j = 0; j < badids.length && !nodeMatch; j++) {
+      nodeMatch = nodeMatch ||
+        (blockedNodes[i] == win.document.getElementById(badids[j]));
+    }
+
+    allNodeMatch = allNodeMatch && nodeMatch;
+  }
+  is(allNodeMatch, true, "All annotated nodes are expected in the tree");
+
+  // Make sure that every node with a badid (see badids) is found in the
+  // blockedNodes. This tells us if we are neglecting to annotate
+  // some nodes
+  allNodeMatch = true;
+  for (let j = 0; j < badids.length; j++) {
+    let nodeMatch = false;
+    for (let i = 0; i < blockedNodes.length && !nodeMatch; i++) {
+      nodeMatch = nodeMatch ||
+        (blockedNodes[i] == win.document.getElementById(badids[j]));
+    }
+
+    allNodeMatch = allNodeMatch && nodeMatch;
+  }
+  is(allNodeMatch, aBlocked, "All tracking nodes are expected to be annotated as such");
+}
+
+SpecialPowers.pushPrefEnv(
+  {"set": [
+      ["privacy.trackingprotection.enabled", false],
+      ["privacy.trackingprotection.pbmode.enabled", true],
+      ["privacy.trackingprotection.testing.report_blocked_node", true],
+  ]}, test);
+
+async function test() {
+  SimpleTest.registerCleanupFunction(UrlClassifierTestUtils.cleanupTestTrackers);
+  await UrlClassifierTestUtils.addTestTrackers();
+
+  // Normal mode, with the pref (trackers should be loaded)
+  await testOnWindow(false).then(function(aWindow) {
+    checkLoads(aWindow, false);
+    aWindow.close();
+  });
+
+  // Private Browsing, with the pref (trackers should be blocked)
+  await testOnWindow(true).then(function(aWindow) {
+    checkLoads(aWindow, true);
+    aWindow.close();
+  });
+
+  // Private Browsing, without the pref (trackers should be loaded)
+  await SpecialPowers.setBoolPref("privacy.trackingprotection.pbmode.enabled", false);
+  await testOnWindow(true).then(function(aWindow) {
+    checkLoads(aWindow, false);
+    aWindow.close();
+  });
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+
+</script>
+
+</pre>
+<iframe id="testFrame" width="100%" height="100%" onload=""></iframe>
+</body>
+</html>