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diff --git a/browser/base/content/test/referrer/head.js b/browser/base/content/test/referrer/head.js
new file mode 100644
index 0000000000..c812d73e80
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+++ b/browser/base/content/test/referrer/head.js
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+const REFERRER_URL_BASE = "/browser/browser/base/content/test/referrer/";
+const REFERRER_POLICYSERVER_URL =
+  "test1.example.com" + REFERRER_URL_BASE + "file_referrer_policyserver.sjs";
+const REFERRER_POLICYSERVER_URL_ATTRIBUTE =
+  "test1.example.com" +
+  REFERRER_URL_BASE +
+  "file_referrer_policyserver_attr.sjs";
+
+var gTestWindow = null;
+var rounds = 0;
+
+// We test that the UI code propagates three pieces of state - the referrer URI
+// itself, the referrer policy, and the triggering principal. After that, we
+// trust nsIWebNavigation to do the right thing with the info it's given, which
+// is covered more exhaustively by dom/base/test/test_bug704320.html (which is
+// a faster content-only test). So, here, we limit ourselves to cases that
+// would break when the UI code drops either of these pieces; we don't try to
+// duplicate the entire cross-product test in bug 704320 - that would be slow,
+// especially when we're opening a new window for each case.
+var _referrerTests = [
+  // 1. Normal cases - no referrer policy, no special attributes.
+  //    We expect a full referrer normally, and no referrer on downgrade.
+  {
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    fromScheme: "http://",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    toScheme: "http://",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    result: "http://test1.example.com/browser", // full referrer
+  },
+  {
+    fromScheme: "https://",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    toScheme: "http://",
+    result: "", // no referrer when downgrade
+  },
+  // 2. Origin referrer policy - we expect an origin referrer,
+  //    even on downgrade.  But rel=noreferrer trumps this.
+  {
+    fromScheme: "https://",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    toScheme: "http://",
+    policy: "origin",
+    result: "https://test1.example.com/", // origin, even on downgrade
+  },
+  {
+    fromScheme: "https://",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    toScheme: "http://",
+    policy: "origin",
+    rel: "noreferrer",
+    result: "", // rel=noreferrer trumps meta-referrer
+  },
+  // 3. XXX: using no-referrer here until we support all attribute values (bug 1178337)
+  //    Origin-when-cross-origin policy - this depends on the triggering
+  //    principal.  We expect full referrer for same-origin requests,
+  //    and origin referrer for cross-origin requests.
+  {
+    fromScheme: "https://",
+    toScheme: "https://",
+    policy: "no-referrer",
+    result: "", // same origin https://test1.example.com/browser
+  },
+  {
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    fromScheme: "http://",
+    toScheme: "https://",
+    policy: "no-referrer",
+    result: "", // cross origin http://test1.example.com
+  },
+];
+
+/**
+ * Returns the test object for a given test number.
+ * @param aTestNumber The test number - 0, 1, 2, ...
+ * @return The test object, or undefined if the number is out of range.
+ */
+function getReferrerTest(aTestNumber) {
+  return _referrerTests[aTestNumber];
+}
+
+/**
+ * Returns shimmed test object for a given test number.
+ *
+ * @param aTestNumber The test number - 0, 1, 2, ...
+ * @return The test object with result hard-coded to "",
+ *          or undefined if the number is out of range.
+ */
+function getRemovedReferrerTest(aTestNumber) {
+  let testCase = _referrerTests[aTestNumber];
+  if (testCase) {
+    // We want all the referrer tests to fail!
+    testCase.result = "";
+  }
+
+  return testCase;
+}
+
+/**
+ * Returns a brief summary of the test, for logging.
+ * @param aTestNumber The test number - 0, 1, 2...
+ * @return The test description.
+ */
+function getReferrerTestDescription(aTestNumber) {
+  let test = getReferrerTest(aTestNumber);
+  return (
+    "policy=[" +
+    test.policy +
+    "] " +
+    "rel=[" +
+    test.rel +
+    "] " +
+    test.fromScheme +
+    " -> " +
+    test.toScheme
+  );
+}
+
+/**
+ * Clicks the link.
+ * @param aWindow The window to click the link in.
+ * @param aLinkId The id of the link element.
+ * @param aOptions The options for synthesizeMouseAtCenter.
+ */
+function clickTheLink(aWindow, aLinkId, aOptions) {
+  return BrowserTestUtils.synthesizeMouseAtCenter(
+    "#" + aLinkId,
+    aOptions,
+    aWindow.gBrowser.selectedBrowser
+  );
+}
+
+/**
+ * Extracts the referrer result from the target window.
+ * @param aWindow The window where the referrer target has loaded.
+ * @return {Promise}
+ * @resolves When extacted, with the text of the (trimmed) referrer.
+ */
+function referrerResultExtracted(aWindow) {
+  return SpecialPowers.spawn(aWindow.gBrowser.selectedBrowser, [], function () {
+    return content.document.getElementById("testdiv").textContent;
+  });
+}
+
+/**
+ * Waits for browser delayed startup to finish.
+ * @param aWindow The window to wait for.
+ * @return {Promise}
+ * @resolves When the window is loaded.
+ */
+function delayedStartupFinished(aWindow) {
+  return new Promise(function (resolve) {
+    Services.obs.addObserver(function observer(aSubject, aTopic) {
+      if (aWindow == aSubject) {
+        Services.obs.removeObserver(observer, aTopic);
+        resolve();
+      }
+    }, "browser-delayed-startup-finished");
+  });
+}
+
+/**
+ * Waits for some (any) tab to load. The caller triggers the load.
+ * @param aWindow The window where to wait for a tab to load.
+ * @return {Promise}
+ * @resolves With the tab once it's loaded.
+ */
+function someTabLoaded(aWindow) {
+  return BrowserTestUtils.waitForNewTab(gTestWindow.gBrowser, null, true);
+}
+
+/**
+ * Waits for a new window to open and load. The caller triggers the open.
+ * @return {Promise}
+ * @resolves With the new window once it's open and loaded.
+ */
+function newWindowOpened() {
+  return TestUtils.topicObserved("browser-delayed-startup-finished").then(
+    ([win]) => win
+  );
+}
+
+/**
+ * Opens the context menu.
+ * @param aWindow The window to open the context menu in.
+ * @param aLinkId The id of the link to open the context menu on.
+ * @return {Promise}
+ * @resolves With the menu popup when the context menu is open.
+ */
+function contextMenuOpened(aWindow, aLinkId) {
+  let popupShownPromise = BrowserTestUtils.waitForEvent(
+    aWindow.document,
+    "popupshown"
+  );
+  // Simulate right-click.
+  clickTheLink(aWindow, aLinkId, { type: "contextmenu", button: 2 });
+  return popupShownPromise.then(e => e.target);
+}
+
+/**
+ * Performs a context menu command.
+ * @param aWindow The window with the already open context menu.
+ * @param aMenu The menu popup to hide.
+ * @param aItemId The id of the menu item to activate.
+ */
+function doContextMenuCommand(aWindow, aMenu, aItemId) {
+  let command = aWindow.document.getElementById(aItemId);
+  command.doCommand();
+  aMenu.hidePopup();
+}
+
+/**
+ * Loads a single test case, i.e., a source url into gTestWindow.
+ * @param aTestNumber The test case number - 0, 1, 2...
+ * @return {Promise}
+ * @resolves When the source url for this test case is loaded.
+ */
+function referrerTestCaseLoaded(aTestNumber, aParams) {
+  let test = getReferrerTest(aTestNumber);
+  let server =
+    rounds == 0
+      ? REFERRER_POLICYSERVER_URL
+      : REFERRER_POLICYSERVER_URL_ATTRIBUTE;
+  let url =
+    test.fromScheme +
+    server +
+    "?scheme=" +
+    escape(test.toScheme) +
+    "&policy=" +
+    escape(test.policy || "") +
+    "&rel=" +
+    escape(test.rel || "") +
+    "&cross=" +
+    escape(test.cross || "");
+  let browser = gTestWindow.gBrowser;
+  return BrowserTestUtils.openNewForegroundTab(
+    browser,
+    () => {
+      browser.selectedTab = BrowserTestUtils.addTab(browser, url, aParams);
+    },
+    false,
+    true
+  );
+}
+
+/**
+ * Checks the result of the referrer test, and moves on to the next test.
+ * @param aTestNumber The test number - 0, 1, 2, ...
+ * @param aNewWindow The new window where the referrer target opened, or null.
+ * @param aNewTab The new tab where the referrer target opened, or null.
+ * @param aStartTestCase The callback to start the next test, aTestNumber + 1.
+ */
+function checkReferrerAndStartNextTest(
+  aTestNumber,
+  aNewWindow,
+  aNewTab,
+  aStartTestCase,
+  aParams = {}
+) {
+  referrerResultExtracted(aNewWindow || gTestWindow).then(function (result) {
+    // Compare the actual result against the expected one.
+    let test = getReferrerTest(aTestNumber);
+    let desc = getReferrerTestDescription(aTestNumber);
+    is(result, test.result, desc);
+
+    // Clean up - close new tab / window, and then the source tab.
+    aNewTab && (aNewWindow || gTestWindow).gBrowser.removeTab(aNewTab);
+    aNewWindow && aNewWindow.close();
+    is(gTestWindow.gBrowser.tabs.length, 2, "two tabs open");
+    gTestWindow.gBrowser.removeTab(gTestWindow.gBrowser.tabs[1]);
+
+    // Move on to the next test.  Or finish if we're done.
+    var nextTestNumber = aTestNumber + 1;
+    if (getReferrerTest(nextTestNumber)) {
+      referrerTestCaseLoaded(nextTestNumber, aParams).then(function () {
+        aStartTestCase(nextTestNumber);
+      });
+    } else if (rounds == 0) {
+      nextTestNumber = 0;
+      rounds = 1;
+      referrerTestCaseLoaded(nextTestNumber, aParams).then(function () {
+        aStartTestCase(nextTestNumber);
+      });
+    } else {
+      finish();
+    }
+  });
+}
+
+/**
+ * Fires up the complete referrer test.
+ * @param aStartTestCase The callback to start a single test case, called with
+ * the test number - 0, 1, 2... Needs to trigger the navigation from the source
+ * page, and call checkReferrerAndStartNextTest() when the target is loaded.
+ */
+function startReferrerTest(aStartTestCase, params = {}) {
+  waitForExplicitFinish();
+
+  // Open the window where we'll load the source URLs.
+  gTestWindow = openDialog(location, "", "chrome,all,dialog=no", "about:blank");
+  registerCleanupFunction(function () {
+    gTestWindow && gTestWindow.close();
+  });
+
+  // Load and start the first test.
+  delayedStartupFinished(gTestWindow).then(function () {
+    referrerTestCaseLoaded(0, params).then(function () {
+      aStartTestCase(0);
+    });
+  });
+}