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diff --git a/toolkit/components/cookiebanners/test/browser/head.js b/toolkit/components/cookiebanners/test/browser/head.js
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+++ b/toolkit/components/cookiebanners/test/browser/head.js
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+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_DOMAIN_A = "example.com";
+const TEST_DOMAIN_B = "example.org";
+const TEST_DOMAIN_C = "example.net";
+
+const TEST_ORIGIN_A = "https://" + TEST_DOMAIN_A;
+const TEST_ORIGIN_B = "https://" + TEST_DOMAIN_B;
+const TEST_ORIGIN_C = "https://" + TEST_DOMAIN_C;
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  ""
+);
+
+const TEST_PAGE_A = TEST_ORIGIN_A + TEST_PATH + "file_banner.html";
+const TEST_PAGE_B = TEST_ORIGIN_B + TEST_PATH + "file_banner.html";
+// Page C has a different banner element ID than A and B.
+const TEST_PAGE_C = TEST_ORIGIN_C + TEST_PATH + "file_banner_b.html";
+
+function genUUID() {
+  return Services.uuid.generateUUID().number.slice(1, -1);
+}
+
+/**
+ * Common setup function for cookie banner handling tests.
+ */
+async function testSetup() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Enable debug logging.
+      ["cookiebanners.listService.logLevel", "Debug"],
+    ],
+  });
+
+  // Reset GLEAN (FOG) telemetry to avoid data bleeding over from other tests.
+  Services.fog.testResetFOG();
+
+  registerCleanupFunction(() => {
+    Services.prefs.clearUserPref("cookiebanners.service.mode");
+    Services.prefs.clearUserPref("cookiebanners.service.mode.privateBrowsing");
+    if (Services.cookieBanners.isEnabled) {
+      // Restore original rules.
+      Services.cookieBanners.resetRules(true);
+    }
+  });
+}
+
+/**
+ * Setup function for click tests.
+ */
+async function clickTestSetup() {
+  await testSetup();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Enable debug logging.
+      ["cookiebanners.bannerClicking.logLevel", "Debug"],
+      ["cookiebanners.bannerClicking.testing", true],
+      ["cookiebanners.bannerClicking.timeout", 500],
+      ["cookiebanners.bannerClicking.enabled", true],
+    ],
+  });
+}
+
+/**
+ * Setup function for cookie injector tests.
+ */
+async function cookieInjectorTestSetup() {
+  await testSetup();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["cookiebanners.cookieInjector.enabled", true],
+      // Required to dispatch cookiebanner events.
+      ["cookiebanners.bannerClicking.enabled", true],
+    ],
+  });
+}
+
+/**
+ * A helper function returns a promise which resolves when the banner clicking
+ * is finished for the given domain.
+ *
+ * @param {String} domain the domain that should run the banner clicking.
+ */
+function promiseBannerClickingFinish(domain) {
+  return new Promise(resolve => {
+    Services.obs.addObserver(function observer(subject, topic, data) {
+      if (data != domain) {
+        return;
+      }
+
+      Services.obs.removeObserver(
+        observer,
+        "cookie-banner-test-clicking-finish"
+      );
+      resolve();
+    }, "cookie-banner-test-clicking-finish");
+  });
+}
+
+/**
+ * A helper function to verify the banner state of the given browsingContext.
+ *
+ * @param {BrowsingContext} bc - the browsing context
+ * @param {boolean} visible - if the banner should be visible.
+ * @param {boolean} expected - the expected banner click state.
+ * @param {string} [bannerId] - id of the cookie banner element.
+ */
+async function verifyBannerState(bc, visible, expected, bannerId = "banner") {
+  info("Verify the cookie banner state.");
+
+  await SpecialPowers.spawn(
+    bc,
+    [visible, expected, bannerId],
+    (visible, expected, bannerId) => {
+      let banner = content.document.getElementById(bannerId);
+
+      is(
+        banner.checkVisibility({
+          checkOpacity: true,
+          checkVisibilityCSS: true,
+        }),
+        visible,
+        `The banner element should be ${visible ? "visible" : "hidden"}`
+      );
+
+      let result = content.document.getElementById("result");
+
+      is(result.textContent, expected, "The build click state is correct.");
+    }
+  );
+}
+
+/**
+ * A helper function to open the test page and verify the banner state.
+ *
+ * @param {Window} [win] - the chrome window object.
+ * @param {String} domain - the domain of the testing page.
+ * @param {String} testURL - the url of the testing page.
+ * @param {boolean} visible - if the banner should be visible.
+ * @param {boolean} expected - the expected banner click state.
+ * @param {string} [bannerId] - id of the cookie banner element.
+ * @param {boolean} [keepTabOpen] - whether to leave the tab open after the test
+ * function completed.
+ */
+async function openPageAndVerify({
+  win = window,
+  domain,
+  testURL,
+  visible,
+  expected,
+  bannerId = "banner",
+  keepTabOpen = false,
+}) {
+  info(`Opening ${testURL}`);
+
+  let promise = promiseBannerClickingFinish(domain);
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(win.gBrowser, testURL);
+
+  await promise;
+
+  await verifyBannerState(tab.linkedBrowser, visible, expected, bannerId);
+
+  if (!keepTabOpen) {
+    BrowserTestUtils.removeTab(tab);
+  }
+}
+
+/**
+ * A helper function to open the test page in an iframe and verify the banner
+ * state in the iframe.
+ *
+ * @param {Window} win - the chrome window object.
+ * @param {String} domain - the domain of the testing iframe page.
+ * @param {String} testURL - the url of the testing iframe page.
+ * @param {boolean} visible - if the banner should be visible.
+ * @param {boolean} expected - the expected banner click state.
+ */
+async function openIframeAndVerify({
+  win,
+  domain,
+  testURL,
+  visible,
+  expected,
+}) {
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    win.gBrowser,
+    TEST_ORIGIN_C
+  );
+
+  let promise = promiseBannerClickingFinish(domain);
+
+  let iframeBC = await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [testURL],
+    async testURL => {
+      let iframe = content.document.createElement("iframe");
+      iframe.src = testURL;
+      content.document.body.appendChild(iframe);
+      await ContentTaskUtils.waitForEvent(iframe, "load");
+
+      return iframe.browsingContext;
+    }
+  );
+
+  await promise;
+  await verifyBannerState(iframeBC, visible, expected);
+
+  BrowserTestUtils.removeTab(tab);
+}
+
+/**
+ * A helper function to insert testing rules.
+ */
+function insertTestClickRules() {
+  info("Clearing existing rules");
+  Services.cookieBanners.resetRules(false);
+
+  info("Inserting test rules.");
+
+  info("Add opt-out click rule for DOMAIN_A.");
+  let ruleA = Cc["@mozilla.org/cookie-banner-rule;1"].createInstance(
+    Ci.nsICookieBannerRule
+  );
+  ruleA.id = genUUID();
+  ruleA.domains = [TEST_DOMAIN_A];
+
+  ruleA.addClickRule(
+    "div#banner",
+    false,
+    Ci.nsIClickRule.RUN_ALL,
+    null,
+    "button#optOut",
+    "button#optIn"
+  );
+  Services.cookieBanners.insertRule(ruleA);
+
+  info("Add opt-in click rule for DOMAIN_B.");
+  let ruleB = Cc["@mozilla.org/cookie-banner-rule;1"].createInstance(
+    Ci.nsICookieBannerRule
+  );
+  ruleB.id = genUUID();
+  ruleB.domains = [TEST_DOMAIN_B];
+
+  ruleB.addClickRule(
+    "div#banner",
+    false,
+    Ci.nsIClickRule.RUN_ALL,
+    null,
+    null,
+    "button#optIn"
+  );
+  Services.cookieBanners.insertRule(ruleB);
+
+  info("Add global ruleC which targets a non-existing banner (presence).");
+  let ruleC = Cc["@mozilla.org/cookie-banner-rule;1"].createInstance(
+    Ci.nsICookieBannerRule
+  );
+  ruleC.id = genUUID();
+  ruleC.domains = [];
+  ruleC.addClickRule(
+    "div#nonExistingBanner",
+    false,
+    Ci.nsIClickRule.RUN_ALL,
+    null,
+    null,
+    "button#optIn"
+  );
+  Services.cookieBanners.insertRule(ruleC);
+
+  info("Add global ruleD which targets a non-existing banner (presence).");
+  let ruleD = Cc["@mozilla.org/cookie-banner-rule;1"].createInstance(
+    Ci.nsICookieBannerRule
+  );
+  ruleD.id = genUUID();
+  ruleD.domains = [];
+  ruleD.addClickRule(
+    "div#nonExistingBanner2",
+    false,
+    Ci.nsIClickRule.RUN_ALL,
+    null,
+    "button#optOut",
+    "button#optIn"
+  );
+  Services.cookieBanners.insertRule(ruleD);
+}
+
+/**
+ * Inserts cookie injection test rules for TEST_DOMAIN_A and TEST_DOMAIN_B.
+ */
+function insertTestCookieRules() {
+  info("Clearing existing rules");
+  Services.cookieBanners.resetRules(false);
+
+  info("Inserting test rules.");
+
+  let ruleA = Cc["@mozilla.org/cookie-banner-rule;1"].createInstance(
+    Ci.nsICookieBannerRule
+  );
+  ruleA.domains = [TEST_DOMAIN_A, TEST_DOMAIN_C];
+
+  Services.cookieBanners.insertRule(ruleA);
+  ruleA.addCookie(
+    true,
+    `cookieConsent_${TEST_DOMAIN_A}_1`,
+    "optOut1",
+    null, // empty host to fall back to .<domain>
+    "/",
+    3600,
+    "",
+    false,
+    false,
+    false,
+    0,
+    0
+  );
+  ruleA.addCookie(
+    true,
+    `cookieConsent_${TEST_DOMAIN_A}_2`,
+    "optOut2",
+    null,
+    "/",
+    3600,
+    "",
+    false,
+    false,
+    false,
+    0,
+    0
+  );
+
+  // An opt-in cookie rule for DOMAIN_B.
+  let ruleB = Cc["@mozilla.org/cookie-banner-rule;1"].createInstance(
+    Ci.nsICookieBannerRule
+  );
+  ruleB.domains = [TEST_DOMAIN_B];
+
+  Services.cookieBanners.insertRule(ruleB);
+  ruleB.addCookie(
+    false,
+    `cookieConsent_${TEST_DOMAIN_B}_1`,
+    "optIn1",
+    TEST_DOMAIN_B,
+    "/",
+    3600,
+    "UNSET",
+    false,
+    false,
+    true,
+    0,
+    0
+  );
+}
+
+/**
+ * Test the Glean.cookieBannersClick.result metric.
+ * @param {*} expected - Object mapping labels to counters. Omitted labels are
+ * asserted to be in initial state (undefined =^ 0)
+ * @param {boolean} [resetFOG] - Whether to reset all FOG telemetry after the
+ * method has finished.
+ */
+async function testClickResultTelemetry(expected, resetFOG = true) {
+  // TODO: Bug 1805653: Enable tests for Linux.
+  if (AppConstants.platform == "linux") {
+    ok(true, "Skip click telemetry tests on linux.");
+    return;
+  }
+
+  // Ensure we have all data from the content process.
+  await Services.fog.testFlushAllChildren();
+
+  let labels = [
+    "success",
+    "success_dom_content_loaded",
+    "success_mutation_pre_load",
+    "success_mutation_post_load",
+    "fail",
+    "fail_banner_not_found",
+    "fail_banner_not_visible",
+    "fail_button_not_found",
+    "fail_no_rule_for_mode",
+    "fail_actor_destroyed",
+  ];
+
+  let testMetricState = doAssert => {
+    for (let label of labels) {
+      if (doAssert) {
+        is(
+          Glean.cookieBannersClick.result[label].testGetValue(),
+          expected[label],
+          `Counter for label '${label}' has correct state.`
+        );
+      } else if (
+        Glean.cookieBannersClick.result[label].testGetValue() !==
+        expected[label]
+      ) {
+        return false;
+      }
+    }
+
+    return true;
+  };
+
+  // Wait for the labeled counter to match the expected state. Returns greedy on
+  // mismatch.
+  try {
+    await TestUtils.waitForCondition(
+      testMetricState,
+      "Waiting for cookieBannersClick.result metric to match."
+    );
+  } finally {
+    // Test again but this time with assertions and test all labels.
+    testMetricState(true);
+
+    // Reset telemetry, even if the test condition above throws. This is to
+    // avoid failing subsequent tests in case of a test failure.
+    if (resetFOG) {
+      Services.fog.testResetFOG();
+    }
+  }
+}
+
+/**
+ * Triggers a cookie banner handling feature and tests the events dispatched.
+ * @param {*} options - Test options.
+ * @param {nsICookieBannerService::Modes} options.mode - The cookie banner
+ * service mode to test with.
+ * @param {function} options.initFn - Function to call for test initialization.
+ * @param {function} options.triggerFn - Function to call to trigger the banner
+ * handling feature.
+ * @param {string} options.testURL - URL where the test will trigger the banner
+ * handling feature.
+ * @returns {Promise} Resolves when the test completes, after cookie banner
+ * events.
+ */
+async function runEventTest({ mode, initFn, triggerFn, testURL }) {
+  await SpecialPowers.pushPrefEnv({
+    set: [["cookiebanners.service.mode", mode]],
+  });
+
+  await initFn();
+
+  let expectEventDetected = mode != Ci.nsICookieBannerService.MODE_DISABLED;
+  let expectEventHandled =
+    mode == Ci.nsICookieBannerService.MODE_REJECT ||
+    mode == Ci.nsICookieBannerService.MODE_REJECT_OR_ACCEPT;
+
+  let eventObservedDetected = false;
+  let eventObservedHandled = false;
+
+  // This is a bit hacky, we use side effects caused by the checkFn we pass into
+  // waitForEvent to keep track of whether an event fired.
+  let promiseEventDetected = BrowserTestUtils.waitForEvent(
+    window,
+    "cookiebannerdetected",
+    false,
+    () => {
+      eventObservedDetected = true;
+      return true;
+    }
+  );
+  let promiseEventHandled = BrowserTestUtils.waitForEvent(
+    window,
+    "cookiebannerhandled",
+    false,
+    () => {
+      eventObservedHandled = true;
+      return true;
+    }
+  );
+
+  // If we expect any events check which one comes first.
+  let firstEventPromise;
+  if (expectEventDetected || expectEventHandled) {
+    firstEventPromise = Promise.race([
+      promiseEventHandled,
+      promiseEventDetected,
+    ]);
+  }
+
+  await triggerFn();
+
+  let eventDetected;
+  if (expectEventDetected) {
+    eventDetected = await promiseEventDetected;
+
+    is(
+      eventDetected.type,
+      "cookiebannerdetected",
+      "Should dispatch cookiebannerdetected event."
+    );
+  }
+
+  let eventHandled;
+  if (expectEventHandled) {
+    eventHandled = await promiseEventHandled;
+    is(
+      eventHandled.type,
+      "cookiebannerhandled",
+      "Should dispatch cookiebannerhandled event."
+    );
+  }
+
+  // For MODE_DISABLED this array will be empty, because we don't expect any
+  // events to be dispatched.
+  let eventsToTest = [eventDetected, eventHandled].filter(event => !!event);
+
+  for (let event of eventsToTest) {
+    info(`Testing properties of event ${event.type}`);
+
+    let { windowContext } = event.detail;
+    ok(
+      windowContext,
+      `Event ${event.type} detail should contain a WindowContext`
+    );
+
+    let browser = windowContext.browsingContext.top.embedderElement;
+    ok(
+      browser,
+      "WindowContext should have an associated top embedder element."
+    );
+    is(
+      browser.tagName,
+      "browser",
+      "The top embedder element should be a browser"
+    );
+    let chromeWin = browser.ownerGlobal;
+    is(
+      chromeWin,
+      window,
+      "The chrome window associated with the browser should match the window where the cookie banner was handled."
+    );
+    is(
+      chromeWin.gBrowser.selectedBrowser,
+      browser,
+      "The browser associated with the event should be the selected browser."
+    );
+    is(
+      browser.currentURI.spec,
+      testURL,
+      "The browser's URI spec should match the cookie banner test page."
+    );
+  }
+
+  let firstEvent = await firstEventPromise;
+  is(
+    expectEventDetected || expectEventHandled,
+    !!firstEvent,
+    "Should have observed the first event if banner clicking is enabled."
+  );
+
+  if (expectEventDetected || expectEventHandled) {
+    is(
+      firstEvent.type,
+      "cookiebannerdetected",
+      "Detected event should be dispatched first"
+    );
+  }
+
+  is(
+    eventObservedDetected,
+    expectEventDetected,
+    `Should ${
+      expectEventDetected ? "" : "not "
+    }have observed 'cookiebannerdetected' event for mode ${mode}`
+  );
+  is(
+    eventObservedHandled,
+    expectEventHandled,
+    `Should ${
+      expectEventHandled ? "" : "not "
+    }have observed 'cookiebannerhandled' event for mode ${mode}`
+  );
+
+  // Clean up pending promises by dispatching artificial cookiebanner events.
+  // Otherwise the test fails because of pending event listeners which
+  // BrowserTestUtils.waitForEvent registered.
+  for (let eventType of ["cookiebannerdetected", "cookiebannerhandled"]) {
+    let event = new CustomEvent(eventType, {
+      bubbles: true,
+      cancelable: false,
+    });
+    window.windowUtils.dispatchEventToChromeOnly(window, event);
+  }
+
+  await promiseEventDetected;
+  await promiseEventHandled;
+}