Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

158 files changed, 25960 insertions, 0 deletions

diff --git a/browser/components/search/test/browser/426329.xml b/browser/components/search/test/browser/426329.xml
new file mode 100644
index 0000000000..b565ed7288
--- /dev/null
+++ b/browser/components/search/test/browser/426329.xml
@@ -0,0 +1,11 @@
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/"
+                       xmlns:moz="http://www.mozilla.org/2006/browser/search/">
+  <ShortName>Bug 426329</ShortName>
+  <Description>426329 Search</Description>
+  <InputEncoding>utf-8</InputEncoding>
+  <Image width="16" height="16">data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAABGklEQVQoz2NgGB6AnZ1dUlJSXl4eSDIyMhLW4Ovr%2B%2Fr168uXL69Zs4YoG%2BLi4i5dusTExMTGxsbNzd3f37937976%2BnpmZmagbHR09J49e5YvX66kpATVEBYW9ubNm2nTphkbG7e2tp44cQLIuHfvXm5urpaWFlDKysqqu7v73LlzECMYIiIiHj58mJCQoKKicvXq1bS0NKBgW1vbjh074uPjgeqAXE1NzSdPnvDz84M0AEUvXLgAsW379u1z5swBen3jxo2zZ892cHB4%2BvQp0KlAfwI1cHJyghQFBwfv2rULokFXV%2FfixYu7d%2B8GGqGgoMDKyrpu3br9%2B%2FcDuXl5eVA%2FAEWBfoWHAdAYoNuAYQ0XAeoUERFhGDYAAPoUaT2dfWJuAAAAAElFTkSuQmCC</Image>
+  <Url type="text/html" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/test.html">
+    <Param name="test" value="{searchTerms}"/>
+  </Url>
+  <moz:SearchForm>http://mochi.test:8888/browser/browser/components/search/test/browser/test.html</moz:SearchForm>
+</OpenSearchDescription>
diff --git a/browser/components/search/test/browser/browser.toml b/browser/components/search/test/browser/browser.toml
new file mode 100644
index 0000000000..028cc7e233
--- /dev/null
+++ b/browser/components/search/test/browser/browser.toml
@@ -0,0 +1,103 @@
+[DEFAULT]
+support-files = [
+  "mozsearch.sjs",
+  "test_search.html",
+  "426329.xml",
+  "discovery.html",
+  "head.js",
+  "opensearch.html",
+  "test.html",
+  "testEngine.xml",
+  "testEngine_diacritics.xml",
+  "testEngine_dupe.xml",
+  "testEngine_mozsearch.xml",
+  "tooManyEnginesOffered.html",
+]
+
+["browser_426329.js"]
+
+["browser_addKeywordSearch.js"]
+
+["browser_contentContextMenu.js"]
+support-files = ["browser_contentContextMenu.xhtml"]
+
+["browser_contentSearch.js"]
+support-files = [
+  "contentSearchBadImage.xml",
+  "contentSearchSuggestions.sjs",
+  "contentSearchSuggestions.xml",
+  "testEngine_chromeicon.xml",
+]
+
+["browser_contentSearchUI.js"]
+support-files = [
+  "contentSearchUI.html",
+  "contentSearchUI.js",
+  "searchSuggestionEngine.sjs",
+]
+
+["browser_contentSearchUI_default.js"]
+
+["browser_contextSearchTabPosition.js"]
+
+["browser_contextmenu.js"]
+
+["browser_contextmenu_whereToOpenLink.js"]
+
+["browser_defaultPrivate_nimbus.js"]
+support-files = [
+  "search-engines/basic/manifest.json",
+  "search-engines/private/manifest.json",
+]
+
+["browser_google_behavior.js"]
+
+["browser_hiddenOneOffs_diacritics.js"]
+
+["browser_ime_composition.js"]
+
+["browser_oneOffContextMenu.js"]
+
+["browser_oneOffContextMenu_setDefault.js"]
+
+["browser_private_search_perwindowpb.js"]
+
+["browser_rich_suggestions.js"]
+support-files = ["trendingSuggestionEngine.sjs"]
+
+["browser_searchEngine_behaviors.js"]
+
+["browser_search_annotation.js"]
+
+["browser_search_discovery.js"]
+
+["browser_search_nimbus_reload.js"]
+
+["browser_searchbar_addEngine.js"]
+
+["browser_searchbar_context.js"]
+
+["browser_searchbar_default.js"]
+
+["browser_searchbar_enter.js"]
+
+["browser_searchbar_keyboard_navigation.js"]
+skip-if = [
+  "os == 'win' && debug",  # Bug 1792718
+  "os == 'linux' && asan", # Bug 1792718
+  "debug",                 # Bug 1792718
+  "tsan",                  # Bug 1792718
+]
+
+["browser_searchbar_openpopup.js"]
+
+["browser_searchbar_results.js"]
+
+["browser_searchbar_smallpanel_keyboard_navigation.js"]
+
+["browser_searchbar_widths.js"]
+
+["browser_tooManyEnginesOffered.js"]
+
+["browser_trending_suggestions.js"]
+support-files = ["trendingSuggestionEngine.sjs"]
diff --git a/browser/components/search/test/browser/browser_426329.js b/browser/components/search/test/browser/browser_426329.js
new file mode 100644
index 0000000000..093c793048
--- /dev/null
+++ b/browser/components/search/test/browser/browser_426329.js
@@ -0,0 +1,301 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
+ChromeUtils.defineESModuleGetters(this, {
+  FormHistoryTestUtils:
+    "resource://testing-common/FormHistoryTestUtils.sys.mjs",
+});
+
+function expectedURL(aSearchTerms) {
+  const ENGINE_HTML_BASE =
+    "http://mochi.test:8888/browser/browser/components/search/test/browser/test.html";
+  let searchArg = Services.textToSubURI.ConvertAndEscape("utf-8", aSearchTerms);
+  return ENGINE_HTML_BASE + "?test=" + searchArg;
+}
+
+function simulateClick(aEvent, aTarget) {
+  let event = document.createEvent("MouseEvent");
+  let ctrlKeyArg = aEvent.ctrlKey || false;
+  let altKeyArg = aEvent.altKey || false;
+  let shiftKeyArg = aEvent.shiftKey || false;
+  let metaKeyArg = aEvent.metaKey || false;
+  let buttonArg = aEvent.button || 0;
+  event.initMouseEvent(
+    "click",
+    true,
+    true,
+    window,
+    0,
+    0,
+    0,
+    0,
+    0,
+    ctrlKeyArg,
+    altKeyArg,
+    shiftKeyArg,
+    metaKeyArg,
+    buttonArg,
+    null
+  );
+  aTarget.dispatchEvent(event);
+}
+
+// modified from toolkit/components/satchel/test/test_form_autocomplete.html
+function checkMenuEntries(expectedValues) {
+  let actualValues = getMenuEntries();
+  is(
+    actualValues.length,
+    expectedValues.length,
+    "Checking length of expected menu"
+  );
+  for (let i = 0; i < expectedValues.length; i++) {
+    is(actualValues[i], expectedValues[i], "Checking menu entry #" + i);
+  }
+}
+
+function getMenuEntries() {
+  // Could perhaps pull values directly from the controller, but it seems
+  // more reliable to test the values that are actually in the richlistbox?
+  return Array.from(searchBar.textbox.popup.richlistbox.itemChildren, item =>
+    item.getAttribute("ac-value")
+  );
+}
+
+var searchBar;
+var searchButton;
+var searchEntries = ["test"];
+var preSelectedBrowser;
+var preTabNo;
+
+async function prepareTest() {
+  preSelectedBrowser = gBrowser.selectedBrowser;
+  preTabNo = gBrowser.tabs.length;
+
+  await SimpleTest.promiseFocus();
+
+  if (document.activeElement == searchBar) {
+    return;
+  }
+
+  let focusPromise = BrowserTestUtils.waitForEvent(searchBar.textbox, "focus");
+  gURLBar.focus();
+  searchBar.focus();
+  await focusPromise;
+}
+
+add_setup(async function () {
+  await Services.search.init();
+
+  await gCUITestUtils.addSearchBar();
+
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: "http://mochi.test:8888/browser/browser/components/search/test/browser/426329.xml",
+    setAsDefault: true,
+  });
+
+  searchBar = BrowserSearch.searchBar;
+  searchBar.value = "test";
+  searchButton = searchBar.querySelector(".search-go-button");
+
+  registerCleanupFunction(() => {
+    searchBar.value = "";
+    while (gBrowser.tabs.length != 1) {
+      gBrowser.removeTab(gBrowser.tabs[0], { animate: false });
+    }
+    BrowserTestUtils.startLoadingURIString(
+      gBrowser.selectedBrowser,
+      "about:blank",
+      {
+        triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal(
+          {}
+        ),
+      }
+    );
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function testReturn() {
+  await prepareTest();
+  EventUtils.synthesizeKey("KEY_Enter");
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  is(gBrowser.tabs.length, preTabNo, "Return key did not open new tab");
+  is(
+    gBrowser.currentURI.spec,
+    expectedURL(searchBar.value),
+    "testReturn opened correct search page"
+  );
+});
+
+add_task(async function testAltReturn() {
+  await prepareTest();
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, () => {
+    EventUtils.synthesizeKey("KEY_Enter", { altKey: true });
+  });
+
+  is(gBrowser.tabs.length, preTabNo + 1, "Alt+Return key added new tab");
+  is(
+    gBrowser.currentURI.spec,
+    expectedURL(searchBar.value),
+    "testAltReturn opened correct search page"
+  );
+});
+
+add_task(async function testAltGrReturn() {
+  await prepareTest();
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, () => {
+    EventUtils.synthesizeKey("KEY_Enter", { altGraphKey: true });
+  });
+
+  is(gBrowser.tabs.length, preTabNo + 1, "AltGr+Return key added new tab");
+  is(
+    gBrowser.currentURI.spec,
+    expectedURL(searchBar.value),
+    "testAltGrReturn opened correct search page"
+  );
+});
+
+// Shift key has no effect for now, so skip it
+add_task(async function testShiftAltReturn() {
+  /*
+  yield* prepareTest();
+
+  let url = expectedURL(searchBar.value);
+
+  let newTabPromise = BrowserTestUtils.waitForNewTab(gBrowser, url);
+  EventUtils.synthesizeKey("VK_RETURN", { shiftKey: true, altKey: true });
+  yield newTabPromise;
+
+  is(gBrowser.tabs.length, preTabNo + 1, "Shift+Alt+Return key added new tab");
+  is(gBrowser.currentURI.spec, url, "testShiftAltReturn opened correct search page");
+  */
+});
+
+add_task(async function testLeftClick() {
+  await prepareTest();
+  simulateClick({ button: 0 }, searchButton);
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+  is(gBrowser.tabs.length, preTabNo, "LeftClick did not open new tab");
+  is(
+    gBrowser.currentURI.spec,
+    expectedURL(searchBar.value),
+    "testLeftClick opened correct search page"
+  );
+});
+
+add_task(async function testMiddleClick() {
+  await prepareTest();
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, () => {
+    simulateClick({ button: 1 }, searchButton);
+  });
+  is(gBrowser.tabs.length, preTabNo + 1, "MiddleClick added new tab");
+  is(
+    gBrowser.currentURI.spec,
+    expectedURL(searchBar.value),
+    "testMiddleClick opened correct search page"
+  );
+});
+
+add_task(async function testShiftMiddleClick() {
+  await prepareTest();
+
+  let url = expectedURL(searchBar.value);
+
+  let newTabPromise = BrowserTestUtils.waitForNewTab(gBrowser, url);
+  simulateClick({ button: 1, shiftKey: true }, searchButton);
+  let newTab = await newTabPromise;
+
+  is(gBrowser.tabs.length, preTabNo + 1, "Shift+MiddleClick added new tab");
+  is(
+    newTab.linkedBrowser.currentURI.spec,
+    url,
+    "testShiftMiddleClick opened correct search page"
+  );
+});
+
+add_task(async function testRightClick() {
+  preTabNo = gBrowser.tabs.length;
+  BrowserTestUtils.startLoadingURIString(
+    gBrowser.selectedBrowser,
+    "about:blank",
+    {
+      triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal(
+        {}
+      ),
+    }
+  );
+  await new Promise(resolve => {
+    setTimeout(function () {
+      is(gBrowser.tabs.length, preTabNo, "RightClick did not open new tab");
+      is(gBrowser.currentURI.spec, "about:blank", "RightClick did nothing");
+      resolve();
+    }, 2000);
+    simulateClick({ button: 2 }, searchButton);
+  });
+  // The click in the searchbox focuses it, which opens the suggestion
+  // panel. Clean up after ourselves.
+  searchBar.textbox.popup.hidePopup();
+});
+
+add_task(async function testSearchHistory() {
+  let textbox = searchBar._textbox;
+  for (let i = 0; i < searchEntries.length; i++) {
+    let count = await FormHistoryTestUtils.count(
+      textbox.getAttribute("autocompletesearchparam"),
+      { value: searchEntries[i], source: "Bug 426329" }
+    );
+    Assert.greater(
+      count,
+      0,
+      "form history entry '" + searchEntries[i] + "' should exist"
+    );
+  }
+});
+
+add_task(async function testAutocomplete() {
+  let popup = searchBar.textbox.popup;
+  let popupShownPromise = BrowserTestUtils.waitForEvent(popup, "popupshown");
+  searchBar.textbox.showHistoryPopup();
+  await popupShownPromise;
+  checkMenuEntries(searchEntries);
+  searchBar.textbox.closePopup();
+});
+
+add_task(async function testClearHistory() {
+  // Open the textbox context menu to trigger controller attachment.
+  let textbox = searchBar.textbox;
+  let popupShownPromise = BrowserTestUtils.waitForEvent(
+    window,
+    "popupshown",
+    false,
+    event => event.target.classList.contains("textbox-contextmenu")
+  );
+  EventUtils.synthesizeMouseAtCenter(textbox, {
+    type: "contextmenu",
+    button: 2,
+  });
+  await popupShownPromise;
+  // Close the context menu.
+  let contextMenu = document.querySelector(".textbox-contextmenu");
+  contextMenu.hidePopup();
+
+  let menuitem = searchBar._menupopup.querySelector(".searchbar-clear-history");
+  ok(!menuitem.disabled, "Clear history menuitem enabled");
+
+  let historyCleared = promiseObserver("satchel-storage-changed");
+  searchBar._menupopup.activateItem(menuitem);
+  await historyCleared;
+  let count = await FormHistoryTestUtils.count(
+    textbox.getAttribute("autocompletesearchparam")
+  );
+  Assert.equal(count, 0, "History cleared");
+});
+
+function promiseObserver(topic) {
+  return new Promise(resolve => {
+    let obs = (aSubject, aTopic, aData) => {
+      Services.obs.removeObserver(obs, aTopic);
+      resolve(aSubject);
+    };
+    Services.obs.addObserver(obs, topic);
+  });
+}
diff --git a/browser/components/search/test/browser/browser_addKeywordSearch.js b/browser/components/search/test/browser/browser_addKeywordSearch.js
new file mode 100644
index 0000000000..c9153f9974
--- /dev/null
+++ b/browser/components/search/test/browser/browser_addKeywordSearch.js
@@ -0,0 +1,115 @@
+var testData = [
+  { desc: "No path", action: "https://example.com/", param: "q" },
+  {
+    desc: "With path",
+    action: "https://example.com/new-path-here/",
+    param: "q",
+  },
+  { desc: "No action", action: "", param: "q" },
+  {
+    desc: "With Query String",
+    action: "https://example.com/search?oe=utf-8",
+    param: "q",
+  },
+  {
+    desc: "With Unicode Query String",
+    action: "https://example.com/searching",
+    param: "q",
+    testHiddenUnicode: true,
+  },
+];
+
+add_task(async function () {
+  const TEST_URL =
+    "https://example.org/browser/browser/components/search/test/browser/test.html";
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URL);
+
+  let count = 0;
+  for (let method of ["GET", "POST"]) {
+    for (let { desc, action, param, testHiddenUnicode = false } of testData) {
+      info(`Running ${method} keyword test '${desc}'`);
+      let id = `keyword-form-${count++}`;
+      let contextMenu = document.getElementById("contentAreaContextMenu");
+      let contextMenuPromise = BrowserTestUtils.waitForEvent(
+        contextMenu,
+        "popupshown"
+      );
+
+      await SpecialPowers.spawn(
+        tab.linkedBrowser,
+        [{ action, param, method, id, testHiddenUnicode }],
+        async function (args) {
+          let doc = content.document;
+          let form = doc.createElement("form");
+          form.id = args.id;
+          form.method = args.method;
+          form.action = args.action;
+          let element = doc.createElement("input");
+          element.setAttribute("type", "text");
+          element.setAttribute("name", args.param);
+          form.appendChild(element);
+          if (args.testHiddenUnicode) {
+            form.insertAdjacentHTML(
+              "beforeend",
+              `<input name="utf8✓" type="hidden" value="✓">`
+            );
+          }
+          doc.body.appendChild(form);
+        }
+      );
+
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        `#${id} > input`,
+        { type: "contextmenu", button: 2 },
+        tab.linkedBrowser
+      );
+      await contextMenuPromise;
+      let url = action || tab.linkedBrowser.currentURI.spec;
+      let actor = gContextMenu.actor;
+
+      let data = await actor.getSearchFieldBookmarkData(
+        gContextMenu.targetIdentifier
+      );
+      if (method == "GET") {
+        ok(
+          data.spec.endsWith(`${param}=%s`),
+          `Check expected url for field named ${param} and action ${action}`
+        );
+        if (testHiddenUnicode) {
+          ok(
+            data.spec.includes(`utf8%E2%9C%93=%E2%9C%93`),
+            `Check the unicode param is correctly encoded`
+          );
+        }
+      } else {
+        is(
+          data.spec,
+          url,
+          `Check expected url for field named ${param} and action ${action}`
+        );
+        if (testHiddenUnicode) {
+          is(
+            data.postData,
+            `utf8%u2713%3D%u2713&q%3D%25s`,
+            `Check expected POST data for field named ${param} and action ${action}`
+          );
+        } else {
+          is(
+            data.postData,
+            `${param}%3D%25s`,
+            `Check expected POST data for field named ${param} and action ${action}`
+          );
+        }
+      }
+
+      let popupHiddenPromise = BrowserTestUtils.waitForEvent(
+        contextMenu,
+        "popuphidden"
+      );
+      contextMenu.hidePopup();
+      await popupHiddenPromise;
+    }
+  }
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/browser_contentContextMenu.js b/browser/components/search/test/browser/browser_contentContextMenu.js
new file mode 100644
index 0000000000..684428821e
--- /dev/null
+++ b/browser/components/search/test/browser/browser_contentContextMenu.js
@@ -0,0 +1,230 @@
+/* Make sure context menu includes option to search hyperlink text on search
+ * engine.
+ */
+
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault", true],
+      ["browser.search.separatePrivateDefault.ui.enabled", true],
+    ],
+  });
+
+  const url =
+    "http://mochi.test:8888/browser/browser/components/search/test/browser/browser_contentContextMenu.xhtml";
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  const ellipsis = "\u2026";
+
+  let contentAreaContextMenu = document.getElementById(
+    "contentAreaContextMenu"
+  );
+
+  const originalPrivateDefault = await Services.search.getDefaultPrivate();
+  let otherPrivateDefault;
+  for (let engine of await Services.search.getVisibleEngines()) {
+    if (engine.name != originalPrivateDefault.name) {
+      otherPrivateDefault = engine;
+      break;
+    }
+  }
+
+  // Tests if the "Search <engine> for '<some terms>'" context menu item is
+  // shown for the given query string of an element. Tests to make sure label
+  // includes the proper search terms.
+  //
+  // Each test:
+  //
+  //   id: The id of the element to test.
+  //   isSelected: Flag to enable selecting (text highlight) the contents of the
+  //               element.
+  //   shouldBeShown: The display state of the menu item.
+  //   expectedLabelContents: The menu item label should contain a portion of
+  //                          this string. Will only be tested if shouldBeShown
+  //                          is true.
+  //   shouldPrivateBeShown: The display state of the Private Window menu item.
+  //   expectedPrivateLabelContents: The menu item label for the Private Window
+  //                                 should contain a portion of this string.
+  //                                 Will only be tested if shouldPrivateBeShown
+  //                                 is true.
+  let tests = [
+    {
+      id: "link",
+      isSelected: true,
+      shouldBeShown: true,
+      expectedLabelContents: "I'm a link!",
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search in",
+    },
+    {
+      id: "link",
+      isSelected: false,
+      shouldBeShown: true,
+      expectedLabelContents: "I'm a link!",
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search in",
+    },
+    {
+      id: "longLink",
+      isSelected: true,
+      shouldBeShown: true,
+      expectedLabelContents: "I'm a really lo" + ellipsis,
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search in",
+    },
+    {
+      id: "longLink",
+      isSelected: false,
+      shouldBeShown: true,
+      expectedLabelContents: "I'm a really lo" + ellipsis,
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search in",
+    },
+    {
+      id: "plainText",
+      isSelected: true,
+      shouldBeShown: true,
+      expectedLabelContents: "Right clicking " + ellipsis,
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search in",
+    },
+    {
+      id: "plainText",
+      isSelected: false,
+      shouldBeShown: false,
+      shouldPrivateBeShown: false,
+    },
+    {
+      id: "mixedContent",
+      isSelected: true,
+      shouldBeShown: true,
+      expectedLabelContents: "I'm some text, " + ellipsis,
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search in",
+    },
+    {
+      id: "mixedContent",
+      isSelected: false,
+      shouldBeShown: false,
+      shouldPrivateBeShown: false,
+    },
+    {
+      id: "partialLink",
+      isSelected: true,
+      shouldBeShown: true,
+      expectedLabelContents: "link selection",
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search in",
+    },
+    {
+      id: "partialLink",
+      isSelected: false,
+      shouldBeShown: true,
+      expectedLabelContents: "A partial link " + ellipsis,
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search with " + otherPrivateDefault.name,
+      changePrivateDefaultEngine: true,
+    },
+    {
+      id: "surrogatePair",
+      isSelected: true,
+      shouldBeShown: true,
+      expectedLabelContents: "This character\uD83D\uDD25" + ellipsis,
+      shouldPrivateBeShown: true,
+      expectedPrivateLabelContents: "Search with " + otherPrivateDefault.name,
+      changePrivateDefaultEngine: true,
+    },
+  ];
+
+  for (let test of tests) {
+    if (test.changePrivateDefaultEngine) {
+      await Services.search.setDefaultPrivate(
+        otherPrivateDefault,
+        Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+      );
+    }
+
+    await SpecialPowers.spawn(
+      gBrowser.selectedBrowser,
+      [{ selectElement: test.isSelected ? test.id : null }],
+      async function (arg) {
+        let selection = content.getSelection();
+        selection.removeAllRanges();
+
+        if (arg.selectElement) {
+          selection.selectAllChildren(
+            content.document.getElementById(arg.selectElement)
+          );
+        }
+      }
+    );
+
+    let popupShownPromise = BrowserTestUtils.waitForEvent(
+      contentAreaContextMenu,
+      "popupshown"
+    );
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#" + test.id,
+      { type: "contextmenu", button: 2 },
+      gBrowser.selectedBrowser
+    );
+    await popupShownPromise;
+
+    let menuItem = document.getElementById("context-searchselect");
+    is(
+      menuItem.hidden,
+      !test.shouldBeShown,
+      "search context menu item is shown for  '#" +
+        test.id +
+        "' and selected is '" +
+        test.isSelected +
+        "'"
+    );
+
+    if (test.shouldBeShown) {
+      ok(
+        menuItem.label.includes(test.expectedLabelContents),
+        "Menu item text '" +
+          menuItem.label +
+          "' contains the correct search terms '" +
+          test.expectedLabelContents +
+          "'"
+      );
+    }
+
+    menuItem = document.getElementById("context-searchselect-private");
+    is(
+      menuItem.hidden,
+      !test.shouldPrivateBeShown,
+      "private search context menu item is shown for  '#" + test.id + "' "
+    );
+
+    if (test.shouldPrivateBeShown) {
+      ok(
+        menuItem.label.includes(test.expectedPrivateLabelContents),
+        "Menu item text '" +
+          menuItem.label +
+          "' contains the correct search terms '" +
+          test.expectedPrivateLabelContents +
+          "'"
+      );
+    }
+
+    let popupHiddenPromise = BrowserTestUtils.waitForEvent(
+      contentAreaContextMenu,
+      "popuphidden"
+    );
+    contentAreaContextMenu.hidePopup();
+    await popupHiddenPromise;
+
+    if (test.changePrivateDefaultEngine) {
+      await Services.search.setDefaultPrivate(
+        originalPrivateDefault,
+        Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+      );
+    }
+  }
+
+  // Cleanup.
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/search/test/browser/browser_contentContextMenu.xhtml b/browser/components/search/test/browser/browser_contentContextMenu.xhtml
new file mode 100644
index 0000000000..16e32eb8ac
--- /dev/null
+++ b/browser/components/search/test/browser/browser_contentContextMenu.xhtml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <body>
+    <a href="http://mozilla.org" id="link">I'm a link!</a>
+    <br/>
+    <a href="http://mozilla.org" id="longLink">I'm a really long link and I should be truncated.</a>
+    <br/>
+    <span id="plainText">
+      Right clicking me when I'm selected should show the menu item.
+    </span>
+    <br/>
+    <span id="mixedContent">
+      I'm some text, and <a href="http://mozilla.org">I'm a link!</a>
+    </span>
+    <br/>
+    <a href="http://mozilla.org">A partial <span id="partialLink">link selection</span></a>
+    <br/>
+    <span id="surrogatePair">
+      This character🔥  shouldn't be truncated.
+    </span>
+  </body>
+</html>
diff --git a/browser/components/search/test/browser/browser_contentSearch.js b/browser/components/search/test/browser/browser_contentSearch.js
new file mode 100644
index 0000000000..7b9328fb94
--- /dev/null
+++ b/browser/components/search/test/browser/browser_contentSearch.js
@@ -0,0 +1,516 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+ChromeUtils.defineESModuleGetters(this, {
+  SearchTestUtils: "resource://testing-common/SearchTestUtils.sys.mjs",
+});
+
+SearchTestUtils.init(this);
+
+const SERVICE_EVENT_TYPE = "ContentSearchService";
+const CLIENT_EVENT_TYPE = "ContentSearchClient";
+
+var arrayBufferIconTested = false;
+var plainURIIconTested = false;
+
+function sendEventToContent(browser, data) {
+  return SpecialPowers.spawn(
+    browser,
+    [CLIENT_EVENT_TYPE, data],
+    (eventName, eventData) => {
+      content.dispatchEvent(
+        new content.CustomEvent(eventName, {
+          detail: Cu.cloneInto(eventData, content),
+        })
+      );
+    }
+  );
+}
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.newtab.preload", false],
+      ["browser.search.separatePrivateDefault.ui.enabled", true],
+      ["browser.search.separatePrivateDefault", true],
+    ],
+  });
+
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: "chrome://mochitests/content/browser/browser/components/search/test/browser/testEngine.xml",
+    setAsDefault: true,
+  });
+
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: "chrome://mochitests/content/browser/browser/components/search/test/browser/testEngine_diacritics.xml",
+    setAsDefaultPrivate: true,
+  });
+
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + "testEngine_chromeicon.xml",
+  });
+});
+
+add_task(async function GetState() {
+  let { browser } = await addTab();
+  let statePromise = await waitForTestMsg(browser, "State");
+  sendEventToContent(browser, {
+    type: "GetState",
+  });
+  let msg = await statePromise.donePromise;
+  checkMsg(msg, {
+    type: "State",
+    data: await currentStateObj(false),
+  });
+
+  ok(arrayBufferIconTested, "ArrayBuffer path for the iconData was tested");
+  ok(plainURIIconTested, "Plain URI path for the iconData was tested");
+});
+
+add_task(async function SetDefaultEngine() {
+  let { browser } = await addTab();
+  let newDefaultEngine = await Services.search.getEngineByName("FooChromeIcon");
+  let oldDefaultEngine = await Services.search.getDefault();
+  let searchPromise = await waitForTestMsg(browser, "CurrentEngine");
+  sendEventToContent(browser, {
+    type: "SetCurrentEngine",
+    data: newDefaultEngine.name,
+  });
+  let deferredPromise = new Promise(resolve => {
+    Services.obs.addObserver(function obs(subj, topic, data) {
+      info("Test observed " + data);
+      if (data == "engine-default") {
+        ok(true, "Test observed engine-default");
+        Services.obs.removeObserver(obs, "browser-search-engine-modified");
+        resolve();
+      }
+    }, "browser-search-engine-modified");
+  });
+  info("Waiting for test to observe engine-default...");
+  await deferredPromise;
+  let msg = await searchPromise.donePromise;
+  checkMsg(msg, {
+    type: "CurrentEngine",
+    data: await constructEngineObj(newDefaultEngine),
+  });
+
+  let enginePromise = await waitForTestMsg(browser, "CurrentEngine");
+  await Services.search.setDefault(
+    oldDefaultEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  msg = await enginePromise.donePromise;
+  checkMsg(msg, {
+    type: "CurrentEngine",
+    data: await constructEngineObj(oldDefaultEngine),
+  });
+});
+
+// ContentSearchChild doesn't support setting the private engine at this time
+// as it doesn't need to, so we just test updating the default here.
+add_task(async function setDefaultEnginePrivate() {
+  const engine = await Services.search.getEngineByName("FooChromeIcon");
+  const { browser } = await addTab();
+  let enginePromise = await waitForTestMsg(browser, "CurrentPrivateEngine");
+  await Services.search.setDefaultPrivate(
+    engine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  let msg = await enginePromise.donePromise;
+  checkMsg(msg, {
+    type: "CurrentPrivateEngine",
+    data: await constructEngineObj(engine),
+  });
+});
+
+add_task(async function modifyEngine() {
+  let { browser } = await addTab();
+  let engine = await Services.search.getDefault();
+  let oldAlias = engine.alias;
+  let statePromise = await waitForTestMsg(browser, "CurrentState");
+  engine.alias = "ContentSearchTest";
+  let msg = await statePromise.donePromise;
+  checkMsg(msg, {
+    type: "CurrentState",
+    data: await currentStateObj(),
+  });
+  statePromise = await waitForTestMsg(browser, "CurrentState");
+  engine.alias = oldAlias;
+  msg = await statePromise.donePromise;
+  checkMsg(msg, {
+    type: "CurrentState",
+    data: await currentStateObj(),
+  });
+});
+
+add_task(async function test_hideEngine() {
+  let { browser } = await addTab();
+  let engine = await Services.search.getEngineByName("Foo \u2661");
+  let statePromise = await waitForTestMsg(browser, "CurrentState");
+  engine.hideOneOffButton = true;
+  let msg = await statePromise.donePromise;
+  checkMsg(msg, {
+    type: "CurrentState",
+    data: await currentStateObj(undefined, "Foo \u2661"),
+  });
+  statePromise = await waitForTestMsg(browser, "CurrentState");
+  engine.hideOneOffButton = false;
+  msg = await statePromise.donePromise;
+  checkMsg(msg, {
+    type: "CurrentState",
+    data: await currentStateObj(),
+  });
+});
+
+add_task(async function search() {
+  let { browser } = await addTab();
+  let engine = await Services.search.getDefault();
+  let data = {
+    engineName: engine.name,
+    searchString: "ContentSearchTest",
+    healthReportKey: "ContentSearchTest",
+    searchPurpose: "ContentSearchTest",
+  };
+  let submissionURL = engine.getSubmission(data.searchString, "", data.whence)
+    .uri.spec;
+
+  await performSearch(browser, data, submissionURL);
+});
+
+add_task(async function searchInBackgroundTab() {
+  // This test is like search(), but it opens a new tab after starting a search
+  // in another.  In other words, it performs a search in a background tab.  The
+  // search page should be loaded in the same tab that performed the search, in
+  // the background tab.
+  let { browser } = await addTab();
+  let engine = await Services.search.getDefault();
+  let data = {
+    engineName: engine.name,
+    searchString: "ContentSearchTest",
+    healthReportKey: "ContentSearchTest",
+    searchPurpose: "ContentSearchTest",
+  };
+  let submissionURL = engine.getSubmission(data.searchString, "", data.whence)
+    .uri.spec;
+
+  let searchPromise = performSearch(browser, data, submissionURL);
+  let newTab = BrowserTestUtils.addTab(gBrowser);
+  gBrowser.selectedTab = newTab;
+  registerCleanupFunction(() => gBrowser.removeTab(newTab));
+
+  await searchPromise;
+});
+
+add_task(async function badImage() {
+  let { browser } = await addTab();
+  // If the bad image URI caused an exception to be thrown within ContentSearch,
+  // then we'll hang waiting for the CurrentState responses triggered by the new
+  // engine.  That's what we're testing, and obviously it shouldn't happen.
+  let [engine, currentStateMsg] = await waitForNewEngine(
+    browser,
+    "contentSearchBadImage.xml"
+  );
+  let expectedCurrentState = await currentStateObj();
+  let expectedEngine = expectedCurrentState.engines.find(
+    e => e.name == engine.name
+  );
+  ok(!!expectedEngine, "Sanity check: engine should be in expected state");
+  Assert.strictEqual(
+    expectedEngine.iconData,
+    "chrome://browser/skin/search-engine-placeholder.png",
+    "Sanity check: icon of engine in expected state should be the placeholder: " +
+      expectedEngine.iconData
+  );
+  checkMsg(currentStateMsg, {
+    type: "CurrentState",
+    data: expectedCurrentState,
+  });
+  // Removing the engine triggers a final CurrentState message.  Wait for it so
+  // it doesn't trip up subsequent tests.
+  let statePromise = await waitForTestMsg(browser, "CurrentState");
+  await Services.search.removeEngine(engine);
+  await statePromise.donePromise;
+});
+
+add_task(
+  async function GetSuggestions_AddFormHistoryEntry_RemoveFormHistoryEntry() {
+    let { browser } = await addTab();
+
+    // Add the test engine that provides suggestions.
+    let [engine] = await waitForNewEngine(
+      browser,
+      "contentSearchSuggestions.xml"
+    );
+
+    let searchStr = "browser_contentSearch.js-suggestions-";
+
+    // Add a form history suggestion and wait for Satchel to notify about it.
+    sendEventToContent(browser, {
+      type: "AddFormHistoryEntry",
+      data: {
+        value: searchStr + "form",
+        engineName: engine.name,
+      },
+    });
+    await new Promise(resolve => {
+      Services.obs.addObserver(function onAdd(subj, topic, data) {
+        if (data == "formhistory-add") {
+          Services.obs.removeObserver(onAdd, "satchel-storage-changed");
+          executeSoon(resolve);
+        }
+      }, "satchel-storage-changed");
+    });
+
+    // Send GetSuggestions using the test engine.  Its suggestions should appear
+    // in the remote suggestions in the Suggestions response below.
+    let suggestionsPromise = await waitForTestMsg(browser, "Suggestions");
+    sendEventToContent(browser, {
+      type: "GetSuggestions",
+      data: {
+        engineName: engine.name,
+        searchString: searchStr,
+      },
+    });
+
+    // Check the Suggestions response.
+    let msg = await suggestionsPromise.donePromise;
+    checkMsg(msg, {
+      type: "Suggestions",
+      data: {
+        engineName: engine.name,
+        searchString: searchStr,
+        formHistory: [searchStr + "form"],
+        remote: [searchStr + "foo", searchStr + "bar"],
+      },
+    });
+
+    // Delete the form history suggestion and wait for Satchel to notify about it.
+    sendEventToContent(browser, {
+      type: "RemoveFormHistoryEntry",
+      data: searchStr + "form",
+    });
+
+    await new Promise(resolve => {
+      Services.obs.addObserver(function onRemove(subj, topic, data) {
+        if (data == "formhistory-remove") {
+          Services.obs.removeObserver(onRemove, "satchel-storage-changed");
+          executeSoon(resolve);
+        }
+      }, "satchel-storage-changed");
+    });
+
+    // Send GetSuggestions again.
+    suggestionsPromise = await waitForTestMsg(browser, "Suggestions");
+    sendEventToContent(browser, {
+      type: "GetSuggestions",
+      data: {
+        engineName: engine.name,
+        searchString: searchStr,
+      },
+    });
+
+    // The formHistory suggestions in the Suggestions response should be empty.
+    msg = await suggestionsPromise.donePromise;
+    checkMsg(msg, {
+      type: "Suggestions",
+      data: {
+        engineName: engine.name,
+        searchString: searchStr,
+        formHistory: [],
+        remote: [searchStr + "foo", searchStr + "bar"],
+      },
+    });
+
+    // Finally, clean up by removing the test engine.
+    let statePromise = await waitForTestMsg(browser, "CurrentState");
+    await Services.search.removeEngine(engine);
+    await statePromise.donePromise;
+  }
+);
+
+async function performSearch(browser, data, expectedURL) {
+  let stoppedPromise = BrowserTestUtils.browserStopped(browser, expectedURL);
+  sendEventToContent(browser, {
+    type: "Search",
+    data,
+    expectedURL,
+  });
+
+  await stoppedPromise;
+  // BrowserTestUtils.browserStopped should ensure this, but let's
+  // be absolutely sure.
+  Assert.equal(
+    browser.currentURI.spec,
+    expectedURL,
+    "Correct search page loaded"
+  );
+}
+
+function buffersEqual(actualArrayBuffer, expectedArrayBuffer) {
+  let expectedView = new Int8Array(expectedArrayBuffer);
+  let actualView = new Int8Array(actualArrayBuffer);
+  for (let i = 0; i < expectedView.length; i++) {
+    if (actualView[i] != expectedView[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function arrayBufferEqual(actualArrayBuffer, expectedArrayBuffer) {
+  ok(actualArrayBuffer instanceof ArrayBuffer, "Actual value is ArrayBuffer.");
+  ok(
+    expectedArrayBuffer instanceof ArrayBuffer,
+    "Expected value is ArrayBuffer."
+  );
+  Assert.equal(
+    actualArrayBuffer.byteLength,
+    expectedArrayBuffer.byteLength,
+    "Array buffers have the same length."
+  );
+  ok(
+    buffersEqual(actualArrayBuffer, expectedArrayBuffer),
+    "Buffers are equal."
+  );
+}
+
+function checkArrayBuffers(actual, expected) {
+  if (actual instanceof ArrayBuffer) {
+    arrayBufferEqual(actual, expected);
+  }
+  if (typeof actual == "object") {
+    for (let i in actual) {
+      checkArrayBuffers(actual[i], expected[i]);
+    }
+  }
+}
+
+function checkMsg(actualMsg, expectedMsgData) {
+  SimpleTest.isDeeply(actualMsg, expectedMsgData, "Checking message");
+
+  // Engines contain ArrayBuffers which we have to compare byte by byte and
+  // not as Objects (like SimpleTest.isDeeply does).
+  checkArrayBuffers(actualMsg, expectedMsgData);
+}
+
+async function waitForTestMsg(browser, type) {
+  // We call SpecialPowers.spawn twice because we must let the first one
+  // complete so that the listener is added before we return from this function.
+  // In the second one, we wait for the signal that the expected message has
+  // been received.
+  await SpecialPowers.spawn(
+    browser,
+    [SERVICE_EVENT_TYPE, type],
+    async (childEvent, childType) => {
+      function listener(event) {
+        if (event.detail.type != childType) {
+          return;
+        }
+
+        content.eventDetails = event.detail;
+        content.removeEventListener(childEvent, listener, true);
+      }
+      // Ensure any previous details are cleared, so that we don't
+      // get the wrong ones by mistake.
+      content.eventDetails = undefined;
+      content.addEventListener(childEvent, listener, true);
+    }
+  );
+
+  let donePromise = SpecialPowers.spawn(browser, [type], async childType => {
+    await ContentTaskUtils.waitForCondition(() => {
+      return !!content.eventDetails;
+    }, "Expected " + childType + " event");
+    return content.eventDetails;
+  });
+
+  return { donePromise };
+}
+
+async function waitForNewEngine(browser, basename) {
+  info("Waiting for engine to be added: " + basename);
+
+  // Wait for the search events triggered by adding the new engine.
+  // There are two events triggerd by engine-added and engine-loaded
+  let statePromise = await waitForTestMsg(browser, "CurrentState");
+
+  let engine = await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + basename,
+  });
+  return [engine, await statePromise.donePromise];
+}
+
+async function addTab() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:newtab"
+  );
+  registerCleanupFunction(() => gBrowser.removeTab(tab));
+
+  return { browser: tab.linkedBrowser };
+}
+
+var currentStateObj = async function (isPrivateWindowValue, hiddenEngine = "") {
+  let state = {
+    engines: [],
+    currentEngine: await constructEngineObj(await Services.search.getDefault()),
+    currentPrivateEngine: await constructEngineObj(
+      await Services.search.getDefaultPrivate()
+    ),
+  };
+  for (let engine of await Services.search.getVisibleEngines()) {
+    let uri = engine.getIconURL(16);
+    state.engines.push({
+      name: engine.name,
+      iconData: await iconDataFromURI(uri),
+      hidden: engine.name == hiddenEngine,
+      isAppProvided: engine.isAppProvided,
+    });
+  }
+  if (typeof isPrivateWindowValue == "boolean") {
+    state.isInPrivateBrowsingMode = isPrivateWindowValue;
+    state.isAboutPrivateBrowsing = isPrivateWindowValue;
+  }
+  return state;
+};
+
+async function constructEngineObj(engine) {
+  let uriFavicon = engine.getIconURL(16);
+  return {
+    name: engine.name,
+    iconData: await iconDataFromURI(uriFavicon),
+    isAppProvided: engine.isAppProvided,
+  };
+}
+
+function iconDataFromURI(uri) {
+  if (!uri) {
+    return Promise.resolve(
+      "chrome://browser/skin/search-engine-placeholder.png"
+    );
+  }
+
+  if (!uri.startsWith("data:")) {
+    plainURIIconTested = true;
+    return Promise.resolve(uri);
+  }
+
+  return new Promise(resolve => {
+    let xhr = new XMLHttpRequest();
+    xhr.open("GET", uri, true);
+    xhr.responseType = "arraybuffer";
+    xhr.onerror = () => {
+      resolve("chrome://browser/skin/search-engine-placeholder.png");
+    };
+    xhr.onload = () => {
+      arrayBufferIconTested = true;
+      resolve(xhr.response);
+    };
+    try {
+      xhr.send();
+    } catch (err) {
+      resolve("chrome://browser/skin/search-engine-placeholder.png");
+    }
+  });
+}
diff --git a/browser/components/search/test/browser/browser_contentSearchUI.js b/browser/components/search/test/browser/browser_contentSearchUI.js
new file mode 100644
index 0000000000..9196b1355c
--- /dev/null
+++ b/browser/components/search/test/browser/browser_contentSearchUI.js
@@ -0,0 +1,1158 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TEST_PAGE_BASENAME = "contentSearchUI.html";
+
+const TEST_ENGINE1 = {
+  name: "searchSuggestionEngine1",
+  id: "other-searchSuggestionEngine1",
+  loadPath: "[addon]searchsuggestionengine1@tests.mozilla.org",
+};
+const TEST_ENGINE2 = {
+  name: "searchSuggestionEngine2",
+  id: "other-searchSuggestionEngine2",
+  loadPath: "[addon]searchsuggestionengine2@tests.mozilla.org",
+};
+
+const TEST_MSG = "ContentSearchUIControllerTest";
+
+ChromeUtils.defineESModuleGetters(this, {
+  ContentSearch: "resource:///actors/ContentSearchParent.sys.mjs",
+  FormHistoryTestUtils:
+    "resource://testing-common/FormHistoryTestUtils.sys.mjs",
+  SearchSuggestionController:
+    "resource://gre/modules/SearchSuggestionController.sys.mjs",
+});
+
+const pageURL = getRootDirectory(gTestPath) + TEST_PAGE_BASENAME;
+BrowserTestUtils.registerAboutPage(
+  registerCleanupFunction,
+  "test-about-content-search-ui",
+  pageURL,
+  Ci.nsIAboutModule.URI_SAFE_FOR_UNTRUSTED_CONTENT |
+    Ci.nsIAboutModule.URI_MUST_LOAD_IN_CHILD |
+    Ci.nsIAboutModule.ALLOW_SCRIPT |
+    Ci.nsIAboutModule.URI_CAN_LOAD_IN_PRIVILEGEDABOUT_PROCESS
+);
+
+requestLongerTimeout(2);
+
+function waitForSuggestions() {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], () =>
+    ContentTaskUtils.waitForCondition(
+      () =>
+        Cu.waiveXrays(content).gController.input.getAttribute(
+          "aria-expanded"
+        ) == "true",
+      "Waiting for suggestions",
+      200 // Increased interval to support long textruns.
+    )
+  );
+}
+
+async function waitForSearch() {
+  await BrowserTestUtils.waitForContentEvent(
+    gBrowser.selectedBrowser,
+    "ContentSearchClient",
+    true,
+    event => {
+      if (event.detail.type == "Search") {
+        event.target._eventDetail = event.detail.data;
+        return true;
+      }
+      return false;
+    },
+    true
+  );
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let eventDetail = content._eventDetail;
+    delete content._eventDetail;
+    return eventDetail;
+  });
+}
+
+async function waitForSearchSettings() {
+  await BrowserTestUtils.waitForContentEvent(
+    gBrowser.selectedBrowser,
+    "ContentSearchClient",
+    true,
+    event => {
+      if (event.detail.type == "ManageEngines") {
+        event.target._eventDetail = event.detail.data;
+        return true;
+      }
+      return false;
+    },
+    true
+  );
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let eventDetail = content._eventDetail;
+    delete content._eventDetail;
+    return eventDetail;
+  });
+}
+
+function getCurrentState() {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let controller = Cu.waiveXrays(content).gController;
+    let state = {
+      selectedIndex: controller.selectedIndex,
+      selectedButtonIndex: controller.selectedButtonIndex,
+      numSuggestions: controller._table.hidden ? 0 : controller.numSuggestions,
+      suggestionAtIndex: [],
+      isFormHistorySuggestionAtIndex: [],
+
+      tableHidden: controller._table.hidden,
+
+      inputValue: controller.input.value,
+      ariaExpanded: controller.input.getAttribute("aria-expanded"),
+    };
+
+    if (state.numSuggestions) {
+      for (let i = 0; i < controller.numSuggestions; i++) {
+        state.suggestionAtIndex.push(controller.suggestionAtIndex(i));
+        state.isFormHistorySuggestionAtIndex.push(
+          controller.isFormHistorySuggestionAtIndex(i)
+        );
+      }
+    }
+
+    return state;
+  });
+}
+
+async function msg(type, data = null) {
+  switch (type) {
+    case "reset":
+      // Reset both the input and suggestions by select all + delete. If there was
+      // no text entered, this won't have any effect, so also escape to ensure the
+      // suggestions table is closed.
+      await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+        Cu.waiveXrays(content).gController.input.focus();
+        EventUtils.synthesizeKey("a", { accelKey: true }, content);
+        EventUtils.synthesizeKey("KEY_Delete", {}, content);
+        EventUtils.synthesizeKey("KEY_Escape", {}, content);
+      });
+      break;
+
+    case "key": {
+      let keyName = typeof data == "string" ? data : data.key;
+      await BrowserTestUtils.synthesizeKey(
+        keyName,
+        data.modifiers || {},
+        gBrowser.selectedBrowser
+      );
+      if (data?.waitForSuggestions) {
+        await waitForSuggestions();
+      }
+      break;
+    }
+    case "text": {
+      await SpecialPowers.spawn(
+        gBrowser.selectedBrowser,
+        [data.value],
+        text => {
+          Cu.waiveXrays(content).gController.input.value = text.substring(
+            0,
+            text.length - 1
+          );
+          EventUtils.synthesizeKey(
+            text.substring(text.length - 1),
+            {},
+            content
+          );
+        }
+      );
+      if (data?.waitForSuggestions) {
+        await waitForSuggestions();
+      }
+      break;
+    }
+    case "startComposition":
+      await BrowserTestUtils.synthesizeComposition(
+        "compositionstart",
+        gBrowser.selectedBrowser
+      );
+      break;
+    case "changeComposition": {
+      await BrowserTestUtils.synthesizeCompositionChange(
+        {
+          composition: {
+            string: data.data,
+            clauses: [
+              {
+                length: data.length,
+                attr: Ci.nsITextInputProcessor.ATTR_RAW_CLAUSE,
+              },
+            ],
+          },
+          caret: { start: data.length, length: 0 },
+        },
+        gBrowser.selectedBrowser
+      );
+      if (data?.waitForSuggestions) {
+        await waitForSuggestions();
+      }
+      break;
+    }
+    case "commitComposition":
+      await BrowserTestUtils.synthesizeComposition(
+        "compositioncommitasis",
+        gBrowser.selectedBrowser
+      );
+      break;
+    case "mousemove":
+    case "click": {
+      let event;
+      let index;
+      if (type == "mousemove") {
+        event = {
+          type: "mousemove",
+          clickcount: 0,
+        };
+        index = data;
+      } else {
+        event = data.modifiers || null;
+        index = data.eltIdx;
+      }
+
+      await SpecialPowers.spawn(
+        gBrowser.selectedBrowser,
+        [type, event, index],
+        (eventType, eventArgs, itemIndex) => {
+          let controller = Cu.waiveXrays(content).gController;
+          return new Promise(resolve => {
+            let row;
+            if (itemIndex == -1) {
+              row = controller._table.firstChild;
+            } else {
+              let allElts = [
+                ...controller._suggestionsList.children,
+                ...controller._oneOffButtons,
+                content.document.getElementById("contentSearchSettingsButton"),
+              ];
+              row = allElts[itemIndex];
+            }
+            row.addEventListener(eventType, () => resolve(), { once: true });
+            EventUtils.synthesizeMouseAtCenter(row, eventArgs, content);
+          });
+        }
+      );
+      break;
+    }
+  }
+
+  return getCurrentState();
+}
+
+/**
+ * Focusses the in-content search bar.
+ *
+ * @returns {Promise}
+ *   A promise that is resolved once the focus is complete.
+ */
+function focusContentSearchBar() {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    Cu.waiveXrays(content).input.focus();
+  });
+}
+
+let extension1;
+let extension2;
+
+add_setup(async function () {
+  let originalOnMessageSearch = ContentSearch._onMessageSearch;
+  let originalOnMessageManageEngines = ContentSearch._onMessageManageEngines;
+
+  ContentSearch._onMessageSearch = () => {};
+  ContentSearch._onMessageManageEngines = () => {};
+
+  let currentEngines = await Services.search.getVisibleEngines();
+
+  extension1 = await SearchTestUtils.installSearchExtension(
+    {
+      name: TEST_ENGINE1.name,
+      suggest_url:
+        "https://example.com/browser/browser/components/search/test/browser/searchSuggestionEngine.sjs",
+      suggest_url_get_params: "query={searchTerms}",
+    },
+    { setAsDefault: true }
+  );
+  extension2 = await SearchTestUtils.installSearchExtension({
+    name: TEST_ENGINE2.name,
+    suggest_url:
+      "https://example.com/browser/browser/components/search/test/browser/searchSuggestionEngine.sjs",
+    suggest_url_get_params: "query={searchTerms}",
+  });
+
+  for (let engine of currentEngines) {
+    await Services.search.removeEngine(engine);
+  }
+
+  registerCleanupFunction(async () => {
+    ContentSearch._onMessageSearch = originalOnMessageSearch;
+    ContentSearch._onMessageManageEngines = originalOnMessageManageEngines;
+  });
+
+  await promiseTab();
+});
+
+add_task(async function emptyInput() {
+  await focusContentSearchBar();
+
+  let state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  state = await msg("key", "VK_BACK_SPACE");
+  checkState(state, "", [], -1);
+
+  await msg("reset");
+});
+
+add_task(async function blur() {
+  await focusContentSearchBar();
+
+  let state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    Cu.waiveXrays(content).gController.input.blur();
+  });
+  state = await getCurrentState();
+  checkState(state, "x", [], -1);
+
+  await msg("reset");
+});
+
+add_task(async function upDownKeys() {
+  await focusContentSearchBar();
+
+  let state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  // Cycle down the suggestions starting from no selection.
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xfoo", ["xfoo", "xbar"], 0);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xbar", ["xfoo", "xbar"], 1);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "x", ["xfoo", "xbar"], 2);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "x", ["xfoo", "xbar"], 3);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  // Cycle up starting from no selection.
+  state = await msg("key", "VK_UP");
+  checkState(state, "x", ["xfoo", "xbar"], 3);
+
+  state = await msg("key", "VK_UP");
+  checkState(state, "x", ["xfoo", "xbar"], 2);
+
+  state = await msg("key", "VK_UP");
+  checkState(state, "xbar", ["xfoo", "xbar"], 1);
+
+  state = await msg("key", "VK_UP");
+  checkState(state, "xfoo", ["xfoo", "xbar"], 0);
+
+  state = await msg("key", "VK_UP");
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  await msg("reset");
+});
+
+add_task(async function rightLeftKeys() {
+  await focusContentSearchBar();
+
+  let state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  state = await msg("key", "VK_LEFT");
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  state = await msg("key", "VK_LEFT");
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  state = await msg("key", "VK_RIGHT");
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  state = await msg("key", "VK_RIGHT");
+  checkState(state, "x", [], -1);
+
+  state = await msg("key", { key: "VK_DOWN", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xfoo", ["xfoo", "xbar"], 0);
+
+  // This should make the xfoo suggestion sticky.  To make sure it sticks,
+  // trigger suggestions again and cycle through them by pressing Down until
+  // nothing is selected again.
+  state = await msg("key", "VK_RIGHT");
+  checkState(state, "xfoo", [], -1);
+
+  state = await msg("key", { key: "VK_DOWN", waitForSuggestions: true });
+  checkState(state, "xfoo", ["xfoofoo", "xfoobar"], -1);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xfoofoo", ["xfoofoo", "xfoobar"], 0);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xfoobar", ["xfoofoo", "xfoobar"], 1);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xfoo", ["xfoofoo", "xfoobar"], 2);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xfoo", ["xfoofoo", "xfoobar"], 3);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xfoo", ["xfoofoo", "xfoobar"], -1);
+
+  await msg("reset");
+});
+
+add_task(async function tabKey() {
+  await focusContentSearchBar();
+  await msg("key", { key: "x", waitForSuggestions: true });
+
+  let state = await msg("key", "VK_TAB");
+  checkState(state, "x", ["xfoo", "xbar"], 2);
+
+  state = await msg("key", "VK_TAB");
+  checkState(state, "x", ["xfoo", "xbar"], 3);
+
+  state = await msg("key", { key: "VK_TAB", modifiers: { shiftKey: true } });
+  checkState(state, "x", ["xfoo", "xbar"], 2);
+
+  state = await msg("key", { key: "VK_TAB", modifiers: { shiftKey: true } });
+  checkState(state, "x", [], -1);
+
+  await focusContentSearchBar();
+
+  await msg("key", { key: "VK_DOWN", waitForSuggestions: true });
+
+  for (let i = 0; i < 3; ++i) {
+    state = await msg("key", "VK_TAB");
+  }
+  checkState(state, "x", [], -1);
+
+  await focusContentSearchBar();
+
+  await msg("key", { key: "VK_DOWN", waitForSuggestions: true });
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xfoo", ["xfoo", "xbar"], 0);
+
+  state = await msg("key", "VK_TAB");
+  checkState(state, "xfoo", ["xfoo", "xbar"], 0, 0);
+
+  state = await msg("key", "VK_TAB");
+  checkState(state, "xfoo", ["xfoo", "xbar"], 0, 1);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 1);
+
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "x", ["xfoo", "xbar"], 2);
+
+  state = await msg("key", "VK_UP");
+  checkState(state, "xbar", ["xfoo", "xbar"], 1);
+
+  state = await msg("key", "VK_TAB");
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 0);
+
+  state = await msg("key", "VK_TAB");
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 1);
+
+  state = await msg("key", "VK_TAB");
+  checkState(state, "xbar", [], -1);
+
+  await msg("reset");
+});
+
+add_task(async function cycleSuggestions() {
+  await focusContentSearchBar();
+  await msg("key", { key: "x", waitForSuggestions: true });
+
+  let cycle = async function (aSelectedButtonIndex) {
+    let modifiers = {
+      shiftKey: true,
+      accelKey: true,
+    };
+
+    let state = await msg("key", { key: "VK_DOWN", modifiers });
+    checkState(state, "xfoo", ["xfoo", "xbar"], 0, aSelectedButtonIndex);
+
+    state = await msg("key", { key: "VK_DOWN", modifiers });
+    checkState(state, "xbar", ["xfoo", "xbar"], 1, aSelectedButtonIndex);
+
+    state = await msg("key", { key: "VK_DOWN", modifiers });
+    checkState(state, "x", ["xfoo", "xbar"], -1, aSelectedButtonIndex);
+
+    state = await msg("key", { key: "VK_DOWN", modifiers });
+    checkState(state, "xfoo", ["xfoo", "xbar"], 0, aSelectedButtonIndex);
+
+    state = await msg("key", { key: "VK_UP", modifiers });
+    checkState(state, "x", ["xfoo", "xbar"], -1, aSelectedButtonIndex);
+
+    state = await msg("key", { key: "VK_UP", modifiers });
+    checkState(state, "xbar", ["xfoo", "xbar"], 1, aSelectedButtonIndex);
+
+    state = await msg("key", { key: "VK_UP", modifiers });
+    checkState(state, "xfoo", ["xfoo", "xbar"], 0, aSelectedButtonIndex);
+
+    state = await msg("key", { key: "VK_UP", modifiers });
+    checkState(state, "x", ["xfoo", "xbar"], -1, aSelectedButtonIndex);
+  };
+
+  await cycle();
+
+  // Repeat with a one-off selected.
+  let state = await msg("key", "VK_TAB");
+  checkState(state, "x", ["xfoo", "xbar"], 2);
+  await cycle(0);
+
+  // Repeat with the settings button selected.
+  state = await msg("key", "VK_TAB");
+  checkState(state, "x", ["xfoo", "xbar"], 3);
+  await cycle(1);
+
+  await msg("reset");
+});
+
+add_task(async function cycleOneOffs() {
+  await focusContentSearchBar();
+  await msg("key", { key: "x", waitForSuggestions: true });
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let btn =
+      Cu.waiveXrays(content).gController._oneOffButtons[
+        Cu.waiveXrays(content).gController._oneOffButtons.length - 1
+      ];
+    let newBtn = btn.cloneNode(true);
+    btn.parentNode.appendChild(newBtn);
+    Cu.waiveXrays(content).gController._oneOffButtons.push(newBtn);
+  });
+
+  let state = await msg("key", "VK_DOWN");
+  state = await msg("key", "VK_DOWN");
+  checkState(state, "xbar", ["xfoo", "xbar"], 1);
+
+  let modifiers = {
+    altKey: true,
+  };
+
+  state = await msg("key", { key: "VK_DOWN", modifiers });
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 0);
+
+  state = await msg("key", { key: "VK_DOWN", modifiers });
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 1);
+
+  state = await msg("key", { key: "VK_DOWN", modifiers });
+  checkState(state, "xbar", ["xfoo", "xbar"], 1);
+
+  state = await msg("key", { key: "VK_UP", modifiers });
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 1);
+
+  state = await msg("key", { key: "VK_UP", modifiers });
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 0);
+
+  state = await msg("key", { key: "VK_UP", modifiers });
+  checkState(state, "xbar", ["xfoo", "xbar"], 1);
+
+  // If the settings button is selected, pressing alt+up/down should select the
+  // last/first one-off respectively (and deselect the settings button).
+  await msg("key", "VK_TAB");
+  await msg("key", "VK_TAB");
+  state = await msg("key", "VK_TAB"); // Settings button selected.
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 2);
+
+  state = await msg("key", { key: "VK_UP", modifiers });
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 1);
+
+  state = await msg("key", "VK_TAB");
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 2);
+
+  state = await msg("key", { key: "VK_DOWN", modifiers });
+  checkState(state, "xbar", ["xfoo", "xbar"], 1, 0);
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    Cu.waiveXrays(content).gController._oneOffButtons.pop().remove();
+  });
+  await msg("reset");
+});
+
+add_task(async function mouse() {
+  await focusContentSearchBar();
+
+  let state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  state = await msg("mousemove", 0);
+  checkState(state, "x", ["xfoo", "xbar"], 0);
+
+  state = await msg("mousemove", 1);
+  checkState(state, "x", ["xfoo", "xbar"], 1);
+
+  state = await msg("mousemove", 2);
+  checkState(state, "x", ["xfoo", "xbar"], 2, 0);
+
+  state = await msg("mousemove", 3);
+  checkState(state, "x", ["xfoo", "xbar"], 3, 1);
+
+  state = await msg("mousemove", -1);
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  await msg("reset");
+  await focusContentSearchBar();
+
+  state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  state = await msg("mousemove", 0);
+  checkState(state, "x", ["xfoo", "xbar"], 0);
+
+  state = await msg("mousemove", 2);
+  checkState(state, "x", ["xfoo", "xbar"], 2, 0);
+
+  state = await msg("mousemove", -1);
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  await msg("reset");
+});
+
+add_task(async function formHistory() {
+  await focusContentSearchBar();
+
+  // Type an X and add it to form history.
+  let state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+  // Wait for Satchel to say it's been added to form history.
+  let observePromise = new Promise(resolve => {
+    Services.obs.addObserver(function onAdd(subj, topic, data) {
+      if (data == "formhistory-add") {
+        Services.obs.removeObserver(onAdd, "satchel-storage-changed");
+        executeSoon(resolve);
+      }
+    }, "satchel-storage-changed");
+  });
+
+  await FormHistoryTestUtils.clear("searchbar-history");
+  let entry = await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    return Cu.waiveXrays(content).gController.addInputValueToFormHistory();
+  });
+  await observePromise;
+  Assert.greater(
+    await FormHistoryTestUtils.count("searchbar-history", {
+      source: entry.source,
+    }),
+    0
+  );
+
+  // Reset the input.
+  state = await msg("reset");
+  checkState(state, "", [], -1);
+
+  // Type an X again.  The form history entry should appear.
+  state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(
+    state,
+    "x",
+    [{ str: "x", type: "formHistory" }, "xfoo", "xbar"],
+    -1
+  );
+
+  // Select the form history entry and delete it.
+  state = await msg("key", "VK_DOWN");
+  checkState(
+    state,
+    "x",
+    [{ str: "x", type: "formHistory" }, "xfoo", "xbar"],
+    0
+  );
+
+  // Wait for Satchel.
+  observePromise = new Promise(resolve => {
+    Services.obs.addObserver(function onRemove(subj, topic, data) {
+      if (data == "formhistory-remove") {
+        Services.obs.removeObserver(onRemove, "satchel-storage-changed");
+        executeSoon(resolve);
+      }
+    }, "satchel-storage-changed");
+  });
+  state = await msg("key", "VK_DELETE");
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  await observePromise;
+
+  // Reset the input.
+  state = await msg("reset");
+  checkState(state, "", [], -1);
+
+  // Type an X again.  The form history entry should still be gone.
+  state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  await msg("reset");
+});
+
+add_task(async function formHistory_limit() {
+  info("Check long strings are not added to form history");
+  await focusContentSearchBar();
+  const gLongString = new Array(
+    SearchSuggestionController.SEARCH_HISTORY_MAX_VALUE_LENGTH + 1
+  )
+    .fill("x")
+    .join("");
+  // Type and confirm a very long string.
+  let state = await msg("text", {
+    value: gLongString,
+    waitForSuggestions: true,
+  });
+  checkState(
+    state,
+    gLongString,
+    [`${gLongString}foo`, `${gLongString}bar`],
+    -1
+  );
+
+  await FormHistoryTestUtils.clear("searchbar-history");
+  let entry = await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    return Cu.waiveXrays(content).gController.addInputValueToFormHistory();
+  });
+  // There's nothing we can wait for, since addition should not be happening.
+  /* eslint-disable mozilla/no-arbitrary-setTimeout */
+  await new Promise(resolve => setTimeout(resolve, 500));
+  Assert.equal(
+    await FormHistoryTestUtils.count("searchbar-history", {
+      source: entry.source,
+    }),
+    0
+  );
+
+  await msg("reset");
+});
+
+add_task(async function cycleEngines() {
+  await focusContentSearchBar();
+  await msg("key", { key: "VK_DOWN", waitForSuggestions: true });
+
+  Services.telemetry.clearEvents();
+  Services.fog.testResetFOG();
+
+  let p = SearchTestUtils.promiseSearchNotification(
+    "engine-default",
+    "browser-search-engine-modified"
+  );
+  await msg("key", { key: "VK_DOWN", modifiers: { accelKey: true } });
+  let newEngine = await p;
+  Assert.equal(
+    newEngine.name,
+    TEST_ENGINE2.name,
+    "Should have correctly cycled the engine"
+  );
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "change_default",
+        value: "user_searchbar",
+        extra: {
+          prev_id: TEST_ENGINE1.id,
+          new_id: TEST_ENGINE2.id,
+          new_name: TEST_ENGINE2.name,
+          new_load_path: TEST_ENGINE2.loadPath,
+          new_sub_url: "",
+        },
+      },
+    ],
+    { category: "search", method: "engine" }
+  );
+
+  let snapshot = await Glean.searchEngineDefault.changed.testGetValue();
+  delete snapshot[0].timestamp;
+  Assert.deepEqual(
+    snapshot[0],
+    {
+      category: "search.engine.default",
+      name: "changed",
+      extra: {
+        new_load_path: TEST_ENGINE2.loadPath,
+        previous_engine_id: TEST_ENGINE1.id,
+        change_source: "user_searchbar",
+        new_engine_id: TEST_ENGINE2.id,
+        new_display_name: TEST_ENGINE2.name,
+        new_submission_url: "",
+      },
+    },
+    "Should have received the correct event details"
+  );
+
+  p = SearchTestUtils.promiseSearchNotification(
+    "engine-default",
+    "browser-search-engine-modified"
+  );
+  await msg("key", { key: "VK_UP", modifiers: { accelKey: true } });
+  newEngine = await p;
+  Assert.equal(
+    newEngine.name,
+    TEST_ENGINE1.name,
+    "Should have correctly cycled the engine"
+  );
+
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "change_default",
+        value: "user_searchbar",
+        extra: {
+          prev_id: TEST_ENGINE2.id,
+          new_id: TEST_ENGINE1.id,
+          new_name: TEST_ENGINE1.name,
+          new_load_path: TEST_ENGINE1.loadPath,
+          new_sub_url: "",
+        },
+      },
+    ],
+    { category: "search", method: "engine" }
+  );
+
+  snapshot = await Glean.searchEngineDefault.changed.testGetValue();
+  delete snapshot[1].timestamp;
+  Assert.deepEqual(
+    snapshot[1],
+    {
+      category: "search.engine.default",
+      name: "changed",
+      extra: {
+        new_load_path: TEST_ENGINE1.loadPath,
+        previous_engine_id: TEST_ENGINE2.id,
+        change_source: "user_searchbar",
+        new_engine_id: TEST_ENGINE1.id,
+        new_display_name: TEST_ENGINE1.name,
+        new_submission_url: "",
+      },
+    },
+    "Should have received the correct event details"
+  );
+
+  await msg("reset");
+});
+
+add_task(async function search() {
+  await focusContentSearchBar();
+
+  let modifiers = {};
+  ["altKey", "ctrlKey", "metaKey", "shiftKey"].forEach(
+    k => (modifiers[k] = true)
+  );
+
+  // Test typing a query and pressing enter.
+  let p = waitForSearch();
+  await msg("key", { key: "x", waitForSuggestions: true });
+  await msg("key", { key: "VK_RETURN", modifiers });
+  let mesg = await p;
+  let eventData = {
+    engineName: TEST_ENGINE1.name,
+    searchString: "x",
+    healthReportKey: "test",
+    searchPurpose: "test",
+    originalEvent: modifiers,
+  };
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  // Test typing a query, then selecting a suggestion and pressing enter.
+  p = waitForSearch();
+  await msg("key", { key: "x", waitForSuggestions: true });
+  await msg("key", "VK_DOWN");
+  await msg("key", "VK_DOWN");
+  await msg("key", { key: "VK_RETURN", modifiers });
+  mesg = await p;
+  eventData.searchString = "xfoo";
+  eventData.engineName = TEST_ENGINE1.name;
+  eventData.selection = {
+    index: 1,
+    kind: "key",
+  };
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  // Test typing a query, then selecting a one-off button and pressing enter.
+  p = waitForSearch();
+  await msg("key", { key: "x", waitForSuggestions: true });
+  await msg("key", "VK_UP");
+  await msg("key", "VK_UP");
+  await msg("key", { key: "VK_RETURN", modifiers });
+  mesg = await p;
+  delete eventData.selection;
+  eventData.searchString = "x";
+  eventData.engineName = TEST_ENGINE2.name;
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  // Test typing a query and clicking the search engine header.
+  p = waitForSearch();
+  modifiers.button = 0;
+  await msg("key", { key: "x", waitForSuggestions: true });
+  await msg("mousemove", -1);
+  await msg("click", { eltIdx: -1, modifiers });
+  mesg = await p;
+  eventData.originalEvent = modifiers;
+  eventData.engineName = TEST_ENGINE1.name;
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  // Test typing a query and then clicking a suggestion.
+  await msg("key", { key: "x", waitForSuggestions: true });
+  p = waitForSearch();
+  await msg("mousemove", 1);
+  await msg("click", { eltIdx: 1, modifiers });
+  mesg = await p;
+  eventData.searchString = "xfoo";
+  eventData.selection = {
+    index: 1,
+    kind: "mouse",
+  };
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  // Test typing a query and then clicking a one-off button.
+  await msg("key", { key: "x", waitForSuggestions: true });
+  p = waitForSearch();
+  await msg("mousemove", 3);
+  await msg("click", { eltIdx: 3, modifiers });
+  mesg = await p;
+  eventData.searchString = "x";
+  eventData.engineName = TEST_ENGINE2.name;
+  delete eventData.selection;
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  // Test selecting a suggestion, then clicking a one-off without deselecting the
+  // suggestion, using the keyboard.
+  delete modifiers.button;
+  await msg("key", { key: "x", waitForSuggestions: true });
+  p = waitForSearch();
+  await msg("key", "VK_DOWN");
+  await msg("key", "VK_DOWN");
+  await msg("key", "VK_TAB");
+  await msg("key", { key: "VK_RETURN", modifiers });
+  mesg = await p;
+  eventData.searchString = "xfoo";
+  eventData.selection = {
+    index: 1,
+    kind: "key",
+  };
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  // Test searching when using IME composition.
+  let state = await msg("startComposition", { data: "" });
+  checkState(state, "", [], -1);
+  state = await msg("changeComposition", {
+    data: "x",
+    waitForSuggestions: true,
+  });
+  checkState(
+    state,
+    "x",
+    [
+      { str: "x", type: "formHistory" },
+      { str: "xfoo", type: "formHistory" },
+      "xbar",
+    ],
+    -1
+  );
+  await msg("commitComposition");
+  delete modifiers.button;
+  p = waitForSearch();
+  await msg("key", { key: "VK_RETURN", modifiers });
+  mesg = await p;
+  eventData.searchString = "x";
+  eventData.originalEvent = modifiers;
+  eventData.engineName = TEST_ENGINE1.name;
+  delete eventData.selection;
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  state = await msg("startComposition", { data: "" });
+  checkState(state, "", [], -1);
+  state = await msg("changeComposition", {
+    data: "x",
+    waitForSuggestions: true,
+  });
+  checkState(
+    state,
+    "x",
+    [
+      { str: "x", type: "formHistory" },
+      { str: "xfoo", type: "formHistory" },
+      "xbar",
+    ],
+    -1
+  );
+
+  // Mouse over the first suggestion.
+  state = await msg("mousemove", 0);
+  checkState(
+    state,
+    "x",
+    [
+      { str: "x", type: "formHistory" },
+      { str: "xfoo", type: "formHistory" },
+      "xbar",
+    ],
+    0
+  );
+
+  // Mouse over the second suggestion.
+  state = await msg("mousemove", 1);
+  checkState(
+    state,
+    "x",
+    [
+      { str: "x", type: "formHistory" },
+      { str: "xfoo", type: "formHistory" },
+      "xbar",
+    ],
+    1
+  );
+
+  modifiers.button = 0;
+  p = waitForSearch();
+  await msg("click", { eltIdx: 1, modifiers });
+  mesg = await p;
+  eventData.searchString = "xfoo";
+  eventData.originalEvent = modifiers;
+  eventData.selection = {
+    index: 1,
+    kind: "mouse",
+  };
+  SimpleTest.isDeeply(eventData, mesg, "Search event data");
+
+  await promiseTab();
+  await focusContentSearchBar();
+
+  // Remove form history entries.
+  // Wait for Satchel.
+  let observePromise = new Promise(resolve => {
+    let historyCount = 2;
+    Services.obs.addObserver(function onRemove(subj, topic, data) {
+      if (data == "formhistory-remove") {
+        if (--historyCount) {
+          return;
+        }
+        Services.obs.removeObserver(onRemove, "satchel-storage-changed");
+        executeSoon(resolve);
+      }
+    }, "satchel-storage-changed");
+  });
+
+  await msg("key", { key: "x", waitForSuggestions: true });
+  await msg("key", "VK_DOWN");
+  await msg("key", "VK_DOWN");
+  await msg("key", "VK_DELETE");
+  await msg("key", "VK_DOWN");
+  await msg("key", "VK_DELETE");
+  await observePromise;
+
+  await msg("reset");
+  state = await msg("key", { key: "x", waitForSuggestions: true });
+  checkState(state, "x", ["xfoo", "xbar"], -1);
+
+  await promiseTab();
+  await focusContentSearchBar();
+  await msg("reset");
+});
+
+add_task(async function settings() {
+  await focusContentSearchBar();
+  await msg("key", { key: "VK_DOWN", waitForSuggestions: true });
+  await msg("key", "VK_UP");
+  let p = waitForSearchSettings();
+  await msg("key", "VK_RETURN");
+  await p;
+
+  await msg("reset");
+});
+
+add_task(async function cleanup() {
+  Services.search.restoreDefaultEngines();
+});
+
+function checkState(
+  actualState,
+  expectedInputVal,
+  expectedSuggestions,
+  expectedSelectedIdx,
+  expectedSelectedButtonIdx
+) {
+  expectedSuggestions = expectedSuggestions.map(sugg => {
+    return typeof sugg == "object"
+      ? sugg
+      : {
+          str: sugg,
+          type: "remote",
+        };
+  });
+
+  if (expectedSelectedIdx == -1 && expectedSelectedButtonIdx != undefined) {
+    expectedSelectedIdx =
+      expectedSuggestions.length + expectedSelectedButtonIdx;
+  }
+
+  let expectedState = {
+    selectedIndex: expectedSelectedIdx,
+    numSuggestions: expectedSuggestions.length,
+    suggestionAtIndex: expectedSuggestions.map(s => s.str),
+    isFormHistorySuggestionAtIndex: expectedSuggestions.map(
+      s => s.type == "formHistory"
+    ),
+
+    tableHidden: !expectedSuggestions.length,
+
+    inputValue: expectedInputVal,
+    ariaExpanded: !expectedSuggestions.length ? "false" : "true",
+  };
+  if (expectedSelectedButtonIdx != undefined) {
+    expectedState.selectedButtonIndex = expectedSelectedButtonIdx;
+  } else if (expectedSelectedIdx < expectedSuggestions.length) {
+    expectedState.selectedButtonIndex = -1;
+  } else {
+    expectedState.selectedButtonIndex =
+      expectedSelectedIdx - expectedSuggestions.length;
+  }
+
+  SimpleTest.isDeeply(actualState, expectedState, "State");
+}
+
+var gMsgMan;
+
+async function promiseTab() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+  registerCleanupFunction(() => BrowserTestUtils.removeTab(tab));
+
+  let loadedPromise = BrowserTestUtils.firstBrowserLoaded(window);
+  openTrustedLinkIn("about:test-about-content-search-ui", "current");
+  await loadedPromise;
+}
diff --git a/browser/components/search/test/browser/browser_contentSearchUI_default.js b/browser/components/search/test/browser/browser_contentSearchUI_default.js
new file mode 100644
index 0000000000..47114fa6da
--- /dev/null
+++ b/browser/components/search/test/browser/browser_contentSearchUI_default.js
@@ -0,0 +1,210 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TEST_ENGINE_NAME = "searchSuggestionEngine";
+const HANDOFF_PREF =
+  "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar";
+
+let extension;
+let defaultEngine;
+let addedEngine;
+
+add_setup(async function () {
+  // Disable window occlusion. Bug 1733955
+  if (navigator.platform.indexOf("Win") == 0) {
+    await SpecialPowers.pushPrefEnv({
+      set: [["widget.windows.window_occlusion_tracking.enabled", false]],
+    });
+  }
+
+  defaultEngine = await Services.search.getDefault();
+
+  extension = await SearchTestUtils.installSearchExtension({
+    id: TEST_ENGINE_NAME,
+    name: TEST_ENGINE_NAME,
+    suggest_url:
+      "https://example.com/browser/browser/components/search/test/browser/searchSuggestionEngine.sjs",
+    suggest_url_get_params: "query={searchTerms}",
+  });
+
+  addedEngine = await Services.search.getEngineByName(TEST_ENGINE_NAME);
+
+  // Enable suggestions in this test. Otherwise, the string in the content
+  // search box changes.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.urlbar.suggest.searches", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    await Services.search.setDefault(
+      defaultEngine,
+      Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+    );
+  });
+});
+
+async function ensureIcon(tab, expectedIcon) {
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [expectedIcon],
+    async function (icon) {
+      await ContentTaskUtils.waitForCondition(() => !content.document.hidden);
+
+      let computedStyle = content.window.getComputedStyle(
+        content.document.body
+      );
+      await ContentTaskUtils.waitForCondition(
+        () => computedStyle.getPropertyValue("--newtab-search-icon") != "null",
+        "Search Icon not set."
+      );
+
+      Assert.equal(
+        computedStyle.getPropertyValue("--newtab-search-icon"),
+        `url(${icon})`,
+        "Should have the expected icon"
+      );
+    }
+  );
+}
+
+async function ensurePlaceholder(tab, expectedId, expectedEngine) {
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [expectedId, expectedEngine],
+    async function (id, engine) {
+      await ContentTaskUtils.waitForCondition(() => !content.document.hidden);
+
+      await ContentTaskUtils.waitForCondition(
+        () => content.document.querySelector(".search-handoff-button"),
+        "l10n ID not set."
+      );
+      let buttonNode = content.document.querySelector(".search-handoff-button");
+      let expectedAttributes = { id, args: engine ? { engine } : null };
+      Assert.deepEqual(
+        content.document.l10n.getAttributes(buttonNode),
+        expectedAttributes,
+        "Expected updated l10n ID and args."
+      );
+    }
+  );
+}
+
+async function runNewTabTest(isHandoff) {
+  let tab = await BrowserTestUtils.openNewForegroundTab({
+    url: "about:newtab",
+    gBrowser,
+    waitForLoad: false,
+  });
+
+  let engineIcon = defaultEngine.getIconURL(16);
+
+  await ensureIcon(tab, engineIcon);
+  if (isHandoff) {
+    await ensurePlaceholder(
+      tab,
+      "newtab-search-box-handoff-input",
+      Services.search.defaultEngine.name
+    );
+  }
+
+  await Services.search.setDefault(
+    addedEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  // We only show the engine's own icon for app provided engines, otherwise show
+  // a default. xref https://bugzilla.mozilla.org/show_bug.cgi?id=1449338#c19
+  await ensureIcon(tab, "chrome://global/skin/icons/search-glass.svg");
+  if (isHandoff) {
+    await ensurePlaceholder(tab, "newtab-search-box-handoff-input-no-engine");
+  }
+
+  // Disable suggestions in the Urlbar. This should update the placeholder
+  // string since handoff will now enter search mode.
+  if (isHandoff) {
+    await SpecialPowers.pushPrefEnv({
+      set: [["browser.urlbar.suggest.searches", false]],
+    });
+    await ensurePlaceholder(tab, "newtab-search-box-input");
+    await SpecialPowers.popPrefEnv();
+  }
+
+  await Services.search.setDefault(
+    defaultEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  BrowserTestUtils.removeTab(tab);
+}
+
+add_task(async function test_content_search_attributes() {
+  await SpecialPowers.pushPrefEnv({
+    set: [[HANDOFF_PREF, true]],
+  });
+
+  await runNewTabTest(true);
+  await SpecialPowers.popPrefEnv();
+});
+
+add_task(async function test_content_search_attributes_no_handoff() {
+  await SpecialPowers.pushPrefEnv({
+    set: [[HANDOFF_PREF, false]],
+  });
+
+  await runNewTabTest(false);
+  await SpecialPowers.popPrefEnv();
+});
+
+add_task(async function test_content_search_attributes_in_private_window() {
+  let win = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+    waitForTabURL: "about:privatebrowsing",
+  });
+  let tab = win.gBrowser.selectedTab;
+
+  let engineIcon = defaultEngine.getIconURL(16);
+
+  await ensureIcon(tab, engineIcon);
+  await ensurePlaceholder(
+    tab,
+    "about-private-browsing-handoff",
+    Services.search.defaultEngine.name
+  );
+
+  await Services.search.setDefault(
+    addedEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  // We only show the engine's own icon for app provided engines, otherwise show
+  // a default. xref https://bugzilla.mozilla.org/show_bug.cgi?id=1449338#c19
+  await ensureIcon(tab, "chrome://global/skin/icons/search-glass.svg");
+  await ensurePlaceholder(tab, "about-private-browsing-handoff-no-engine");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.urlbar.suggest.searches", false]],
+  });
+  await ensurePlaceholder(tab, "about-private-browsing-search-btn");
+  await SpecialPowers.popPrefEnv();
+
+  await Services.search.setDefault(
+    defaultEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  await BrowserTestUtils.closeWindow(win);
+});
+
+add_task(async function test_content_search_permanent_private_browsing() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [HANDOFF_PREF, true],
+      ["browser.privatebrowsing.autostart", true],
+    ],
+  });
+
+  let win = await BrowserTestUtils.openNewBrowserWindow();
+  await runNewTabTest(true);
+  await BrowserTestUtils.closeWindow(win);
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/search/test/browser/browser_contextSearchTabPosition.js b/browser/components/search/test/browser/browser_contextSearchTabPosition.js
new file mode 100644
index 0000000000..345167c5b8
--- /dev/null
+++ b/browser/components/search/test/browser/browser_contextSearchTabPosition.js
@@ -0,0 +1,94 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+let engine;
+
+add_setup(async function () {
+  engine = await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + "testEngine.xml",
+    setAsDefault: true,
+  });
+});
+
+add_task(async function test() {
+  let histogramKey = "other-" + engine.name + ".contextmenu";
+  let numSearchesBefore = 0;
+
+  try {
+    let hs = Services.telemetry
+      .getKeyedHistogramById("SEARCH_COUNTS")
+      .snapshot();
+    if (histogramKey in hs) {
+      numSearchesBefore = hs[histogramKey].sum;
+    }
+  } catch (ex) {
+    // No searches performed yet, not a problem, |numSearchesBefore| is 0.
+  }
+
+  let tabs = [];
+  let tabsLoadedDeferred = new Deferred();
+
+  function tabAdded(event) {
+    let tab = event.target;
+    tabs.push(tab);
+
+    // We wait for the blank tab and the two context searches tabs to open.
+    if (tabs.length == 3) {
+      tabsLoadedDeferred.resolve();
+    }
+  }
+
+  let container = gBrowser.tabContainer;
+  container.addEventListener("TabOpen", tabAdded);
+
+  BrowserTestUtils.addTab(gBrowser, "about:blank");
+  BrowserSearch.loadSearchFromContext(
+    "mozilla",
+    false,
+    Services.scriptSecurityManager.getSystemPrincipal(),
+    Services.scriptSecurityManager.getSystemPrincipal().csp,
+    new MouseEvent("click")
+  );
+  BrowserSearch.loadSearchFromContext(
+    "firefox",
+    false,
+    Services.scriptSecurityManager.getSystemPrincipal(),
+    Services.scriptSecurityManager.getSystemPrincipal().csp,
+    new MouseEvent("click")
+  );
+
+  // Wait for all the tabs to open.
+  await tabsLoadedDeferred.promise;
+
+  is(tabs[0], gBrowser.tabs[3], "blank tab has been pushed to the end");
+  is(
+    tabs[1],
+    gBrowser.tabs[1],
+    "first search tab opens next to the current tab"
+  );
+  is(
+    tabs[2],
+    gBrowser.tabs[2],
+    "second search tab opens next to the first search tab"
+  );
+
+  container.removeEventListener("TabOpen", tabAdded);
+  tabs.forEach(gBrowser.removeTab, gBrowser);
+
+  // Make sure that the context searches are correctly recorded in telemetry.
+  // Telemetry is not updated synchronously here, we must wait for it.
+  await TestUtils.waitForCondition(() => {
+    let hs = Services.telemetry
+      .getKeyedHistogramById("SEARCH_COUNTS")
+      .snapshot();
+    return histogramKey in hs && hs[histogramKey].sum == numSearchesBefore + 2;
+  }, "The histogram must contain the correct search count");
+});
+
+function Deferred() {
+  this.promise = new Promise((resolve, reject) => {
+    this.resolve = resolve;
+    this.reject = reject;
+  });
+}
diff --git a/browser/components/search/test/browser/browser_contextmenu.js b/browser/components/search/test/browser/browser_contextmenu.js
new file mode 100644
index 0000000000..67ba48da72
--- /dev/null
+++ b/browser/components/search/test/browser/browser_contextmenu.js
@@ -0,0 +1,249 @@
+/* Any copyright is dedicated to the Public Domain.
+ *  * http://creativecommons.org/publicdomain/zero/1.0/ */
+/*
+ * Test searching for the selected text using the context menu
+ */
+
+const { AddonTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/AddonTestUtils.sys.mjs"
+);
+
+AddonTestUtils.initMochitest(this);
+
+const ENGINE_NAME = "mozSearch";
+const PRIVATE_ENGINE_NAME = "mozPrivateSearch";
+const ENGINE_DATA = new Map([
+  [
+    ENGINE_NAME,
+    "https://example.com/browser/browser/components/search/test/browser/mozsearch.sjs",
+  ],
+  [PRIVATE_ENGINE_NAME, "https://example.com:443/browser/"],
+]);
+
+let engine;
+let privateEngine;
+let extensions = [];
+let oldDefaultEngine;
+let oldDefaultPrivateEngine;
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault", true],
+      ["browser.search.separatePrivateDefault.ui.enabled", true],
+    ],
+  });
+
+  await Services.search.init();
+
+  for (let [name, search_url] of ENGINE_DATA) {
+    let extension = ExtensionTestUtils.loadExtension({
+      manifest: {
+        chrome_settings_overrides: {
+          search_provider: {
+            name,
+            search_url,
+            params: [
+              {
+                name: "test",
+                value: "{searchTerms}",
+              },
+            ],
+          },
+        },
+      },
+    });
+
+    await extension.startup();
+    await AddonTestUtils.waitForSearchProviderStartup(extension);
+    extensions.push(extension);
+  }
+
+  engine = await Services.search.getEngineByName(ENGINE_NAME);
+  Assert.ok(engine, "Got a search engine");
+  oldDefaultEngine = await Services.search.getDefault();
+  await Services.search.setDefault(
+    engine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  privateEngine = await Services.search.getEngineByName(PRIVATE_ENGINE_NAME);
+  Assert.ok(privateEngine, "Got a search engine");
+  oldDefaultPrivateEngine = await Services.search.getDefaultPrivate();
+  await Services.search.setDefaultPrivate(
+    privateEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+});
+
+async function checkContextMenu(
+  win,
+  expectedName,
+  expectedBaseUrl,
+  expectedPrivateName
+) {
+  let contextMenu = win.document.getElementById("contentAreaContextMenu");
+  Assert.ok(contextMenu, "Got context menu XUL");
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    win.gBrowser,
+    "https://example.com/browser/browser/components/search/test/browser/test_search.html"
+  );
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [""], async function () {
+    return new Promise(resolve => {
+      content.document.addEventListener(
+        "selectionchange",
+        function () {
+          resolve();
+        },
+        { once: true }
+      );
+      content.document.getSelection().selectAllChildren(content.document.body);
+    });
+  });
+
+  let eventDetails = { type: "contextmenu", button: 2 };
+
+  let popupPromise = BrowserTestUtils.waitForEvent(contextMenu, "popupshown");
+  BrowserTestUtils.synthesizeMouseAtCenter(
+    "body",
+    eventDetails,
+    win.gBrowser.selectedBrowser
+  );
+  await popupPromise;
+
+  info("checkContextMenu");
+  let searchItem = contextMenu.getElementsByAttribute(
+    "id",
+    "context-searchselect"
+  )[0];
+  Assert.ok(searchItem, "Got search context menu item");
+  Assert.equal(
+    searchItem.label,
+    "Search " + expectedName + " for \u201ctest%20search\u201d",
+    "Check context menu label"
+  );
+  Assert.equal(
+    searchItem.disabled,
+    false,
+    "Check that search context menu item is enabled"
+  );
+
+  let loaded = BrowserTestUtils.waitForNewTab(
+    win.gBrowser,
+    expectedBaseUrl + "?test=test%2520search",
+    true
+  );
+  contextMenu.activateItem(searchItem);
+  let searchTab = await loaded;
+  let browser = win.gBrowser.selectedBrowser;
+  await SpecialPowers.spawn(browser, [], async function () {
+    Assert.ok(
+      !/error/.test(content.document.body.innerHTML),
+      "Ensure there were no errors loading the search page"
+    );
+  });
+
+  searchItem = contextMenu.getElementsByAttribute(
+    "id",
+    "context-searchselect-private"
+  )[0];
+  Assert.ok(searchItem, "Got search in private window context menu item");
+  if (PrivateBrowsingUtils.isWindowPrivate(win)) {
+    Assert.ok(searchItem.hidden, "Search in private window should be hidden");
+  } else {
+    let expectedLabel = expectedPrivateName
+      ? "Search with " + expectedPrivateName + " in a Private Window"
+      : "Search in a Private Window";
+    Assert.equal(searchItem.label, expectedLabel, "Check context menu label");
+    Assert.equal(
+      searchItem.disabled,
+      false,
+      "Check that search context menu item is enabled"
+    );
+  }
+
+  contextMenu.hidePopup();
+
+  BrowserTestUtils.removeTab(searchTab);
+  BrowserTestUtils.removeTab(tab);
+}
+
+add_task(async function test_normalWindow() {
+  await checkContextMenu(
+    window,
+    ENGINE_NAME,
+    "https://example.com/browser/browser/components/search/test/browser/mozsearch.sjs",
+    PRIVATE_ENGINE_NAME
+  );
+});
+
+add_task(async function test_privateWindow() {
+  const win = await BrowserTestUtils.openNewBrowserWindow({ private: true });
+
+  registerCleanupFunction(async () => {
+    await BrowserTestUtils.closeWindow(win);
+  });
+
+  await checkContextMenu(
+    win,
+    PRIVATE_ENGINE_NAME,
+    "https://example.com/browser/"
+  );
+});
+
+add_task(async function test_normalWindow_sameDefaults() {
+  // Set the private default engine to be the same as the current default engine
+  // in 'normal' mode.
+  await Services.search.setDefaultPrivate(
+    await Services.search.getDefault(),
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  await checkContextMenu(
+    window,
+    ENGINE_NAME,
+    "https://example.com/browser/browser/components/search/test/browser/mozsearch.sjs"
+  );
+});
+
+add_task(async function test_privateWindow_no_separate_engine() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // We want select events to be fired.
+      ["browser.search.separatePrivateDefault", false],
+    ],
+  });
+
+  const win = await BrowserTestUtils.openNewBrowserWindow({ private: true });
+
+  registerCleanupFunction(async () => {
+    await BrowserTestUtils.closeWindow(win);
+  });
+
+  await checkContextMenu(
+    win,
+    ENGINE_NAME,
+    "https://example.com/browser/browser/components/search/test/browser/mozsearch.sjs"
+  );
+});
+
+// We can't do the unload within registerCleanupFunction as that's too late for
+// the test to be happy. Do it into a cleanup "test" here instead.
+add_task(async function cleanup() {
+  await Services.search.setDefault(
+    oldDefaultEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  await Services.search.setDefaultPrivate(
+    oldDefaultPrivateEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  await Services.search.removeEngine(engine);
+  await Services.search.removeEngine(privateEngine);
+
+  for (let extension of extensions) {
+    await extension.unload();
+  }
+});
diff --git a/browser/components/search/test/browser/browser_contextmenu_whereToOpenLink.js b/browser/components/search/test/browser/browser_contextmenu_whereToOpenLink.js
new file mode 100644
index 0000000000..ed3fd6901d
--- /dev/null
+++ b/browser/components/search/test/browser/browser_contextmenu_whereToOpenLink.js
@@ -0,0 +1,183 @@
+/* Any copyright is dedicated to the Public Domain.
+ *  * http://creativecommons.org/publicdomain/zero/1.0/ */
+/*
+ * Test searching for the selected text using the context menu
+ */
+
+const { SearchTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SearchTestUtils.sys.mjs"
+);
+
+SearchTestUtils.init(this);
+
+const ENGINE_NAME = "mozSearch";
+const ENGINE_URL =
+  "https://example.com/browser/browser/components/search/test/browser/mozsearch.sjs";
+
+add_setup(async function () {
+  await Services.search.init();
+
+  await SearchTestUtils.installSearchExtension(
+    {
+      name: ENGINE_NAME,
+      search_url: ENGINE_URL,
+      search_url_get_params: "test={searchTerms}",
+    },
+    { setAsDefault: true }
+  );
+});
+
+async function openNewSearchTab(event_args, expect_new_window = false) {
+  // open context menu with right click
+  let contextMenu = document.getElementById("contentAreaContextMenu");
+
+  let popupPromise = BrowserTestUtils.waitForEvent(contextMenu, "popupshown");
+  BrowserTestUtils.synthesizeMouseAtCenter(
+    "body",
+    { type: "contextmenu", button: 2 },
+    gBrowser.selectedBrowser
+  );
+  await popupPromise;
+
+  let searchItem = contextMenu.getElementsByAttribute(
+    "id",
+    "context-searchselect"
+  )[0];
+
+  // open new search tab with desired modifiers
+  let searchTabPromise;
+  if (expect_new_window) {
+    searchTabPromise = BrowserTestUtils.waitForNewWindow({
+      url: ENGINE_URL + "?test=test%2520search",
+    });
+  } else {
+    searchTabPromise = BrowserTestUtils.waitForNewTab(
+      gBrowser,
+      ENGINE_URL + "?test=test%2520search",
+      true
+    );
+  }
+
+  if ("button" in event_args) {
+    // Bug 1704879: activateItem does not currently support button
+    EventUtils.synthesizeMouseAtCenter(searchItem, event_args);
+  } else {
+    contextMenu.activateItem(searchItem, event_args);
+  }
+
+  if (expect_new_window) {
+    let win = await searchTabPromise;
+    return win.gBrowser.selectedTab;
+  }
+  return searchTabPromise;
+}
+
+add_task(async function test_whereToOpenLink() {
+  // open search test page and select search text
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "https://example.com/browser/browser/components/search/test/browser/test_search.html"
+  );
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [""], async function () {
+    return new Promise(resolve => {
+      content.document.addEventListener(
+        "selectionchange",
+        function () {
+          resolve();
+        },
+        { once: true }
+      );
+      content.document.getSelection().selectAllChildren(content.document.body);
+    });
+  });
+
+  // check where context search opens for different buttons/modifiers
+  let searchTab = await openNewSearchTab({});
+  is(
+    searchTab,
+    gBrowser.selectedTab,
+    "Search tab is opened in foreground (no modifiers)"
+  );
+  BrowserTestUtils.removeTab(searchTab);
+
+  // TODO bug 1704883: Re-enable this subtest. Native context menus on macOS do
+  // not yet support alternate mouse buttons.
+  if (
+    !AppConstants.platform == "macosx" ||
+    !Services.prefs.getBoolPref("widget.macos.native-context-menus", false)
+  ) {
+    searchTab = await openNewSearchTab({ button: 1 });
+    isnot(
+      searchTab,
+      gBrowser.selectedTab,
+      "Search tab is opened in background (middle mouse)"
+    );
+    BrowserTestUtils.removeTab(searchTab);
+  }
+
+  searchTab = await openNewSearchTab({ ctrlKey: true });
+  isnot(
+    searchTab,
+    gBrowser.selectedTab,
+    "Search tab is opened in background (Ctrl)"
+  );
+  BrowserTestUtils.removeTab(searchTab);
+
+  let current_browser = gBrowser.selectedBrowser;
+  searchTab = await openNewSearchTab({ shiftKey: true }, true);
+  isnot(
+    current_browser,
+    gBrowser.getBrowserForTab(searchTab),
+    "Search tab is opened in new window (Shift)"
+  );
+  BrowserTestUtils.removeTab(searchTab);
+
+  info("flipping browser.search.context.loadInBackground and re-checking");
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.context.loadInBackground", true]],
+  });
+
+  searchTab = await openNewSearchTab({});
+  isnot(
+    searchTab,
+    gBrowser.selectedTab,
+    "Search tab is opened in background (no modifiers)"
+  );
+  BrowserTestUtils.removeTab(searchTab);
+
+  // TODO bug 1704883: Re-enable this subtest. Native context menus on macOS do
+  // not yet support alternate mouse buttons.
+  if (
+    !AppConstants.platform == "macosx" ||
+    !Services.prefs.getBoolPref("widget.macos.native-context-menus", false)
+  ) {
+    searchTab = await openNewSearchTab({ button: 1 });
+    is(
+      searchTab,
+      gBrowser.selectedTab,
+      "Search tab is opened in foreground (middle mouse)"
+    );
+    BrowserTestUtils.removeTab(searchTab);
+  }
+
+  searchTab = await openNewSearchTab({ ctrlKey: true });
+  is(
+    searchTab,
+    gBrowser.selectedTab,
+    "Search tab is opened in foreground (Ctrl)"
+  );
+  BrowserTestUtils.removeTab(searchTab);
+
+  current_browser = gBrowser.selectedBrowser;
+  searchTab = await openNewSearchTab({ shiftKey: true }, true);
+  isnot(
+    current_browser,
+    gBrowser.getBrowserForTab(searchTab),
+    "Search tab is opened in new window (Shift)"
+  );
+  BrowserTestUtils.removeTab(searchTab);
+
+  // cleanup
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/browser_defaultPrivate_nimbus.js b/browser/components/search/test/browser/browser_defaultPrivate_nimbus.js
new file mode 100644
index 0000000000..ce5acc91a0
--- /dev/null
+++ b/browser/components/search/test/browser/browser_defaultPrivate_nimbus.js
@@ -0,0 +1,155 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const { ExperimentAPI } = ChromeUtils.importESModule(
+  "resource://nimbus/ExperimentAPI.sys.mjs"
+);
+const { ExperimentFakes } = ChromeUtils.importESModule(
+  "resource://testing-common/NimbusTestUtils.sys.mjs"
+);
+
+ChromeUtils.defineESModuleGetters(this, {
+  SearchTestUtils: "resource://testing-common/SearchTestUtils.sys.mjs",
+});
+
+const CONFIG_DEFAULT = [
+  {
+    webExtension: { id: "basic@search.mozilla.org" },
+    appliesTo: [{ included: { everywhere: true } }],
+    default: "yes",
+  },
+  {
+    webExtension: { id: "private@search.mozilla.org" },
+    appliesTo: [
+      {
+        experiment: "testing",
+        included: { everywhere: true },
+      },
+    ],
+    defaultPrivate: "yes",
+  },
+];
+
+SearchTestUtils.init(this);
+
+add_setup(async () => {
+  // Use engines in test directory
+  let searchExtensions = getChromeDir(getResolvedURI(gTestPath));
+  searchExtensions.append("search-engines");
+  await SearchTestUtils.useMochitestEngines(searchExtensions);
+
+  // Current default values.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault.ui.enabled", false],
+      ["browser.search.separatePrivateDefault.urlbarResult.enabled", false],
+      ["browser.search.separatePrivateDefault", true],
+      ["browser.urlbar.suggest.searches", true],
+    ],
+  });
+
+  SearchTestUtils.useMockIdleService();
+  await SearchTestUtils.updateRemoteSettingsConfig(CONFIG_DEFAULT);
+
+  registerCleanupFunction(async () => {
+    let settingsWritten = SearchTestUtils.promiseSearchNotification(
+      "write-settings-to-disk-complete"
+    );
+    await SearchTestUtils.updateRemoteSettingsConfig();
+    await settingsWritten;
+  });
+});
+
+add_task(async function test_nimbus_experiment() {
+  Assert.equal(
+    Services.search.defaultPrivateEngine.name,
+    "basic",
+    "Should have basic as private default while not in experiment"
+  );
+  await ExperimentAPI.ready();
+
+  let reloadObserved =
+    SearchTestUtils.promiseSearchNotification("engines-reloaded");
+
+  let doExperimentCleanup = await ExperimentFakes.enrollWithFeatureConfig({
+    featureId: "searchConfiguration",
+    value: {
+      seperatePrivateDefaultUIEnabled: true,
+      seperatePrivateDefaultUrlbarResultEnabled: false,
+      experiment: "testing",
+    },
+  });
+  await reloadObserved;
+  Assert.equal(
+    Services.search.defaultPrivateEngine.name,
+    "private",
+    "Should have private as private default while in experiment"
+  );
+  reloadObserved =
+    SearchTestUtils.promiseSearchNotification("engines-reloaded");
+  await doExperimentCleanup();
+  await reloadObserved;
+  Assert.equal(
+    Services.search.defaultPrivateEngine.name,
+    "basic",
+    "Should turn off private default and restore default engine after experiment"
+  );
+});
+
+add_task(async function test_nimbus_experiment_urlbar_result_enabled() {
+  Assert.equal(
+    Services.search.defaultPrivateEngine.name,
+    "basic",
+    "Should have basic as private default while not in experiment"
+  );
+  await ExperimentAPI.ready();
+
+  let reloadObserved =
+    SearchTestUtils.promiseSearchNotification("engines-reloaded");
+
+  let doExperimentCleanup = await ExperimentFakes.enrollWithFeatureConfig({
+    featureId: "searchConfiguration",
+    value: {
+      seperatePrivateDefaultUIEnabled: true,
+      seperatePrivateDefaultUrlbarResultEnabled: true,
+      experiment: "testing",
+    },
+  });
+  await reloadObserved;
+  Assert.equal(
+    Services.search.separatePrivateDefaultUrlbarResultEnabled,
+    true,
+    "Should have set the urlbar result enabled value to true"
+  );
+  reloadObserved =
+    SearchTestUtils.promiseSearchNotification("engines-reloaded");
+  await doExperimentCleanup();
+  await reloadObserved;
+  Assert.equal(
+    Services.search.defaultPrivateEngine.name,
+    "basic",
+    "Should turn off private default and restore default engine after experiment"
+  );
+});
+
+add_task(async function test_non_experiment_prefs() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.separatePrivateDefault.ui.enabled", false]],
+  });
+  let uiPref = () =>
+    Services.prefs.getBoolPref(
+      "browser.search.separatePrivateDefault.ui.enabled"
+    );
+  Assert.equal(uiPref(), false, "defaulted false");
+  await ExperimentAPI.ready();
+  let doExperimentCleanup = await ExperimentFakes.enrollWithFeatureConfig({
+    featureId: "privatesearch",
+    value: {
+      seperatePrivateDefaultUIEnabled: true,
+    },
+  });
+  Assert.equal(uiPref(), false, "Pref did not change without experiment");
+  await doExperimentCleanup();
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/search/test/browser/browser_google_behavior.js b/browser/components/search/test/browser/browser_google_behavior.js
new file mode 100644
index 0000000000..cce3b3ce1f
--- /dev/null
+++ b/browser/components/search/test/browser/browser_google_behavior.js
@@ -0,0 +1,215 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Test Google search plugin URLs
+ * TODO: This test is a near duplicate of browser_searchEngine_behaviors.js but
+ * specific to Google. This is required due to bug 1315953.
+ *
+ * Note: Although we have tests for codes in
+ * toolkit/components/tests/xpcshell/searchconfigs, we also need this test as an
+ * integration test to check the search service to selector integration is
+ * working correctly (especially the ESR codes).
+ */
+
+"use strict";
+
+let searchEngineDetails = [
+  {
+    alias: "g",
+    codes: {
+      context: "",
+      keyword: "",
+      newTab: "",
+      submission: "",
+    },
+    name: "Google",
+  },
+];
+
+let region = Services.prefs.getCharPref("browser.search.region");
+let code = "";
+switch (region) {
+  case "US":
+    if (SearchUtils.MODIFIED_APP_CHANNEL == "esr") {
+      code = "firefox-b-1-e";
+    } else {
+      code = "firefox-b-1-d";
+    }
+    break;
+  case "DE":
+    if (SearchUtils.MODIFIED_APP_CHANNEL == "esr") {
+      code = "firefox-b-e";
+    } else {
+      code = "firefox-b-d";
+    }
+    break;
+}
+
+if (code) {
+  let codes = searchEngineDetails[0].codes;
+  codes.context = code;
+  codes.newTab = code;
+  codes.submission = code;
+  codes.keyword = code;
+}
+
+function promiseContentSearchReady(browser) {
+  return SpecialPowers.spawn(browser, [], async function (args) {
+    return new Promise(resolve => {
+      SpecialPowers.pushPrefEnv({
+        set: [
+          [
+            "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar",
+            false,
+          ],
+        ],
+      });
+      if (content.wrappedJSObject.gContentSearchController) {
+        let searchController = content.wrappedJSObject.gContentSearchController;
+        if (searchController.defaultEngine) {
+          resolve();
+        }
+      }
+
+      content.addEventListener(
+        "ContentSearchService",
+        function listener(aEvent) {
+          if (aEvent.detail.type == "State") {
+            content.removeEventListener("ContentSearchService", listener);
+            resolve();
+          }
+        }
+      );
+    });
+  });
+}
+
+add_setup(async function () {
+  await Services.search.init();
+});
+
+for (let engine of searchEngineDetails) {
+  add_task(async function () {
+    let previouslySelectedEngine = Services.search.defaultEngine;
+
+    registerCleanupFunction(function () {
+      Services.search.defaultEngine = previouslySelectedEngine;
+    });
+
+    await testSearchEngine(engine);
+  });
+}
+
+async function testSearchEngine(engineDetails) {
+  let engine = Services.search.getEngineByName(engineDetails.name);
+  Assert.ok(engine, `${engineDetails.name} is installed`);
+
+  Services.search.defaultEngine = engine;
+  engine.alias = engineDetails.alias;
+
+  // Test search URLs (including purposes).
+  let url = engine.getSubmission("foo").uri.spec;
+  let urlParams = new URLSearchParams(url.split("?")[1]);
+  Assert.equal(urlParams.get("q"), "foo", "Check search URL for 'foo'");
+
+  let engineTests = [
+    {
+      name: "context menu search",
+      code: engineDetails.codes.context,
+      run() {
+        // Simulate a contextmenu search
+        // FIXME: This is a bit "low-level"...
+        BrowserSearch._loadSearch(
+          "foo",
+          false,
+          false,
+          "contextmenu",
+          Services.scriptSecurityManager.getSystemPrincipal()
+        );
+      },
+    },
+    {
+      name: "keyword search",
+      code: engineDetails.codes.keyword,
+      run() {
+        gURLBar.value = "? foo";
+        gURLBar.focus();
+        EventUtils.synthesizeKey("KEY_Enter");
+      },
+    },
+    {
+      name: "keyword search with alias",
+      code: engineDetails.codes.keyword,
+      run() {
+        gURLBar.value = `${engineDetails.alias} foo`;
+        gURLBar.focus();
+        EventUtils.synthesizeKey("KEY_Enter");
+      },
+    },
+    {
+      name: "search bar search",
+      code: engineDetails.codes.submission,
+      async preTest() {
+        await gCUITestUtils.addSearchBar();
+      },
+      run() {
+        let sb = BrowserSearch.searchBar;
+        sb.focus();
+        sb.value = "foo";
+        EventUtils.synthesizeKey("KEY_Enter");
+      },
+      postTest() {
+        BrowserSearch.searchBar.value = "";
+        gCUITestUtils.removeSearchBar();
+      },
+    },
+    {
+      name: "new tab search",
+      code: engineDetails.codes.newTab,
+      async preTest(tab) {
+        let browser = tab.linkedBrowser;
+        BrowserTestUtils.startLoadingURIString(browser, "about:newtab");
+        await BrowserTestUtils.browserLoaded(browser, false, "about:newtab");
+
+        await promiseContentSearchReady(browser);
+      },
+      async run(tab) {
+        await SpecialPowers.spawn(tab.linkedBrowser, [], async function (args) {
+          let input = content.document.querySelector("input[id*=search-]");
+          input.focus();
+          input.value = "foo";
+        });
+        EventUtils.synthesizeKey("KEY_Enter");
+      },
+    },
+  ];
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  for (let test of engineTests) {
+    info(`Running: ${test.name}`);
+
+    if (test.preTest) {
+      await test.preTest(tab);
+    }
+
+    let googleUrl =
+      "https://www.google.com/search?client=" + test.code + "&q=foo";
+    let promises = [
+      BrowserTestUtils.waitForDocLoadAndStopIt(googleUrl, tab),
+      BrowserTestUtils.browserStopped(tab.linkedBrowser, googleUrl, true),
+    ];
+
+    await test.run(tab);
+
+    await Promise.all(promises);
+
+    if (test.postTest) {
+      await test.postTest(tab);
+    }
+  }
+
+  engine.alias = undefined;
+  BrowserTestUtils.removeTab(tab);
+}
diff --git a/browser/components/search/test/browser/browser_hiddenOneOffs_diacritics.js b/browser/components/search/test/browser/browser_hiddenOneOffs_diacritics.js
new file mode 100644
index 0000000000..f8d6d34d7e
--- /dev/null
+++ b/browser/components/search/test/browser/browser_hiddenOneOffs_diacritics.js
@@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+// Tests that keyboard navigation in the search panel works as designed.
+
+const searchPopup = document.getElementById("PopupSearchAutoComplete");
+
+const diacritic_engine = "Foo \u2661";
+
+var { Preferences } = ChromeUtils.importESModule(
+  "resource://gre/modules/Preferences.sys.mjs"
+);
+
+let searchIcon;
+let engine;
+
+add_setup(async function () {
+  let searchbar = await gCUITestUtils.addSearchBar();
+  registerCleanupFunction(() => {
+    gCUITestUtils.removeSearchBar();
+  });
+  searchIcon = searchbar.querySelector(".searchbar-search-button");
+
+  let defaultEngine = await Services.search.getDefault();
+  engine = await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + "testEngine_diacritics.xml",
+  });
+  registerCleanupFunction(async () => {
+    await Services.search.setDefault(
+      defaultEngine,
+      Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+    );
+    engine.hideOneOffButton = false;
+  });
+});
+
+add_task(async function test_hidden() {
+  engine.hideOneOffButton = true;
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  await promise;
+
+  ok(
+    !getOneOffs().some(x => x.getAttribute("tooltiptext") == diacritic_engine),
+    "Search engines with diacritics are hidden when added to hiddenOneOffs preference."
+  );
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  info("Closing search panel");
+  EventUtils.synthesizeKey("KEY_Escape");
+  await promise;
+});
+
+add_task(async function test_shown() {
+  engine.hideOneOffButton = false;
+
+  let oneOffsContainer = searchPopup.searchOneOffsContainer;
+  let shownPromise = promiseEvent(searchPopup, "popupshown");
+  let builtPromise = promiseEvent(oneOffsContainer, "rebuild");
+  info("Opening search panel");
+
+  EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  await Promise.all([shownPromise, builtPromise]);
+
+  ok(
+    getOneOffs().some(x => x.getAttribute("tooltiptext") == diacritic_engine),
+    "Search engines with diacritics are shown when removed from hiddenOneOffs preference."
+  );
+
+  let promise = promiseEvent(searchPopup, "popuphidden");
+  searchPopup.hidePopup();
+  await promise;
+});
diff --git a/browser/components/search/test/browser/browser_ime_composition.js b/browser/components/search/test/browser/browser_ime_composition.js
new file mode 100644
index 0000000000..40aa4aa27d
--- /dev/null
+++ b/browser/components/search/test/browser/browser_ime_composition.js
@@ -0,0 +1,77 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests ime composition handling on searchbar.
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+
+  await SearchTestUtils.installSearchExtension({}, { setAsDefault: true });
+
+  registerCleanupFunction(async function () {
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function test_composition_with_focus() {
+  info("Open a page");
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, "https://example.com");
+
+  info("Focus on the search bar");
+  const searchBarTextBox = BrowserSearch.searchBar.textbox;
+  EventUtils.synthesizeMouseAtCenter(searchBarTextBox, {});
+  is(
+    document.activeElement,
+    BrowserSearch.searchBar.textbox,
+    "The text box of search bar has focus"
+  );
+
+  info("Do search with new tab");
+  EventUtils.synthesizeKey("x");
+  EventUtils.synthesizeKey("KEY_Enter", { altKey: true, type: "keydown" });
+  is(gBrowser.tabs.length, 3, "Alt+Return key added new tab");
+  await TestUtils.waitForCondition(
+    () => document.activeElement === gBrowser.selectedBrowser,
+    "Wait for focus to be moved to the browser"
+  );
+  info("The focus is moved to the browser");
+
+  info("Focus on the search bar again");
+  EventUtils.synthesizeMouseAtCenter(searchBarTextBox, {});
+  is(
+    document.activeElement,
+    BrowserSearch.searchBar.textbox,
+    "The textbox of search bar has focus again"
+  );
+
+  info("Type some characters during composition");
+  const string = "ex";
+  EventUtils.synthesizeCompositionChange({
+    composition: {
+      string,
+      clauses: [
+        {
+          length: string.length,
+          attr: Ci.nsITextInputProcessor.ATTR_RAW_CLAUSE,
+        },
+      ],
+    },
+    caret: { start: string.length, length: 0 },
+    key: { key: string[string.length - 1] },
+  });
+
+  info("Commit the composition");
+  EventUtils.synthesizeComposition({
+    type: "compositioncommitasis",
+    key: { key: "KEY_Enter" },
+  });
+  is(
+    document.activeElement,
+    BrowserSearch.searchBar.textbox,
+    "The search bar still has focus"
+  );
+
+  // Close all open tabs
+  await BrowserTestUtils.removeTab(gBrowser.tabs[2]);
+  await BrowserTestUtils.removeTab(gBrowser.tabs[1]);
+});
diff --git a/browser/components/search/test/browser/browser_oneOffContextMenu.js b/browser/components/search/test/browser/browser_oneOffContextMenu.js
new file mode 100644
index 0000000000..c036a5f007
--- /dev/null
+++ b/browser/components/search/test/browser/browser_oneOffContextMenu.js
@@ -0,0 +1,89 @@
+"use strict";
+
+const TEST_ENGINE_NAME = "Foo";
+const TEST_ENGINE_BASENAME = "testEngine.xml";
+
+let searchbar;
+let searchIcon;
+
+add_setup(async function () {
+  searchbar = await gCUITestUtils.addSearchBar();
+  registerCleanupFunction(() => {
+    gCUITestUtils.removeSearchBar();
+  });
+  searchIcon = searchbar.querySelector(".searchbar-search-button");
+
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + TEST_ENGINE_BASENAME,
+  });
+});
+
+add_task(async function telemetry() {
+  let searchPopup = document.getElementById("PopupSearchAutoComplete");
+  let oneOffInstance = searchPopup.oneOffButtons;
+
+  let oneOffButtons = oneOffInstance.buttons;
+
+  // Open the popup.
+  let shownPromise = promiseEvent(searchPopup, "popupshown");
+  let builtPromise = promiseEvent(oneOffInstance, "rebuild");
+  info("Opening search panel");
+  EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  await Promise.all([shownPromise, builtPromise]);
+
+  // Get the one-off button for the test engine.
+  let oneOffButton;
+  for (let node of oneOffButtons.children) {
+    if (node.engine && node.engine.name == TEST_ENGINE_NAME) {
+      oneOffButton = node;
+      break;
+    }
+  }
+  Assert.notEqual(
+    oneOffButton,
+    undefined,
+    "One-off for test engine should exist"
+  );
+
+  // Open the context menu on the one-off.
+  let contextMenu = oneOffInstance.querySelector(
+    ".search-one-offs-context-menu"
+  );
+  let promise = BrowserTestUtils.waitForEvent(contextMenu, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(oneOffButton, {
+    type: "contextmenu",
+    button: 2,
+  });
+  await promise;
+
+  // Click the Search in New Tab menu item.
+  let searchInNewTabMenuItem = contextMenu.querySelector(
+    ".search-one-offs-context-open-in-new-tab"
+  );
+  promise = BrowserTestUtils.waitForNewTab(gBrowser);
+  contextMenu.activateItem(searchInNewTabMenuItem);
+  let tab = await promise;
+
+  // By default the search will open in the background and the popup will stay open:
+  promise = promiseEvent(searchPopup, "popuphidden");
+  info("Closing search panel");
+  EventUtils.synthesizeKey("KEY_Escape");
+  await promise;
+
+  // Check the loaded tab.
+  Assert.equal(
+    tab.linkedBrowser.currentURI.spec,
+    "http://mochi.test:8888/browser/browser/components/search/test/browser/",
+    "Expected search tab should have loaded"
+  );
+
+  BrowserTestUtils.removeTab(tab);
+
+  // Move the cursor out of the panel area to avoid messing with other tests.
+  await EventUtils.promiseNativeMouseEvent({
+    type: "mousemove",
+    target: searchbar,
+    offsetX: 0,
+    offsetY: 0,
+  });
+});
diff --git a/browser/components/search/test/browser/browser_oneOffContextMenu_setDefault.js b/browser/components/search/test/browser/browser_oneOffContextMenu_setDefault.js
new file mode 100644
index 0000000000..9f05e948ed
--- /dev/null
+++ b/browser/components/search/test/browser/browser_oneOffContextMenu_setDefault.js
@@ -0,0 +1,236 @@
+"use strict";
+
+const TEST_ENGINE_NAME = "Foo";
+const TEST_ENGINE_BASENAME = "testEngine.xml";
+const SEARCHBAR_BASE_ID = "searchbar-engine-one-off-item-";
+
+let originalEngine;
+let originalPrivateEngine;
+
+async function resetEngines() {
+  await Services.search.setDefault(
+    originalEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  await Services.search.setDefaultPrivate(
+    originalPrivateEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+}
+
+registerCleanupFunction(resetEngines);
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault.ui.enabled", true],
+      ["browser.search.separatePrivateDefault", true],
+      ["browser.search.widget.inNavBar", true],
+    ],
+  });
+  originalEngine = await Services.search.getDefault();
+  originalPrivateEngine = await Services.search.getDefaultPrivate();
+  registerCleanupFunction(async () => {
+    await resetEngines();
+  });
+
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + TEST_ENGINE_BASENAME,
+  });
+});
+
+async function testSearchBarChangeEngine(win, testPrivate, isPrivateWindow) {
+  info(
+    `Testing search bar with testPrivate: ${testPrivate} isPrivateWindow: ${isPrivateWindow}`
+  );
+
+  const searchPopup = win.document.getElementById("PopupSearchAutoComplete");
+  const searchOneOff = searchPopup.oneOffButtons;
+
+  // Ensure the engine is reset.
+  await resetEngines();
+
+  let oneOffButton = await openPopupAndGetEngineButton(
+    searchPopup,
+    searchOneOff,
+    SEARCHBAR_BASE_ID,
+    TEST_ENGINE_NAME
+  );
+
+  const contextMenu = searchOneOff.contextMenuPopup;
+  const setDefaultEngineMenuItem = searchOneOff.querySelector(
+    ".search-one-offs-context-set-default" + (testPrivate ? "-private" : "")
+  );
+
+  // Click the set default engine menu item.
+  let promise = promiseDefaultEngineChanged(testPrivate);
+  contextMenu.activateItem(setDefaultEngineMenuItem);
+
+  // This also checks the engine correctly changed.
+  await promise;
+
+  if (testPrivate == isPrivateWindow) {
+    let expectedName = originalEngine.name;
+    let expectedImage = originalEngine.getIconURL();
+    if (isPrivateWindow) {
+      expectedName = originalPrivateEngine.name;
+      expectedImage = originalPrivateEngine.getIconURL();
+    }
+
+    Assert.equal(
+      oneOffButton.getAttribute("tooltiptext"),
+      expectedName,
+      "Should now have the original engine's name for the tooltip"
+    );
+    Assert.equal(
+      oneOffButton.image,
+      expectedImage,
+      "Should now have the original engine's uri for the image"
+    );
+  }
+
+  await promiseClosePopup(searchPopup);
+}
+
+add_task(async function test_searchBarChangeEngine() {
+  await testSearchBarChangeEngine(window, false, false);
+  await testSearchBarChangeEngine(window, true, false);
+});
+
+add_task(async function test_searchBarChangeEngine_privateWindow() {
+  const win = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+  await testSearchBarChangeEngine(win, true, true);
+  await BrowserTestUtils.closeWindow(win);
+});
+
+/**
+ * Promises that an engine change has happened for the current engine, which
+ * has resulted in the test engine now being the current engine.
+ *
+ * @param {boolean} testPrivate
+ *   Set to true if we're testing the private default engine.
+ * @returns {Promise} Resolved once the test engine is set as the current engine.
+ */
+function promiseDefaultEngineChanged(testPrivate) {
+  const expectedNotification = testPrivate
+    ? "engine-default-private"
+    : "engine-default";
+  return new Promise(resolve => {
+    function observer(aSub, aTopic, aData) {
+      if (aData == expectedNotification) {
+        Assert.equal(
+          Services.search[
+            testPrivate ? "defaultPrivateEngine" : "defaultEngine"
+          ].name,
+          TEST_ENGINE_NAME,
+          "defaultEngine set"
+        );
+        Services.obs.removeObserver(observer, "browser-search-engine-modified");
+        resolve();
+      }
+    }
+
+    Services.obs.addObserver(observer, "browser-search-engine-modified");
+  });
+}
+
+/**
+ * Opens the specified search popup and gets the test engine from the
+ * one-off buttons.
+ *
+ * @param {object} popup The expected popup.
+ * @param {object} oneOffInstance The expected one-off instance for the popup.
+ * @param {string} baseId The expected string for the id of the current
+ *                        engine button, without the engine name.
+ * @param {string} engineName The engine name for finding the one-off button.
+ * @returns {object} Returns an object that represents the one off button for the
+ *                          test engine.
+ */
+async function openPopupAndGetEngineButton(
+  popup,
+  oneOffInstance,
+  baseId,
+  engineName
+) {
+  const win = oneOffInstance.container.ownerGlobal;
+  // Open the popup.
+  win.gURLBar.blur();
+  let shownPromise = promiseEvent(popup, "popupshown");
+  let builtPromise = promiseEvent(oneOffInstance, "rebuild");
+  let searchbar = win.document.getElementById("searchbar");
+  let searchIcon = searchbar.querySelector(".searchbar-search-button");
+  // Use the search icon to avoid hitting the network.
+  EventUtils.synthesizeMouseAtCenter(searchIcon, {}, win);
+  await Promise.all([shownPromise, builtPromise]);
+
+  const contextMenu = oneOffInstance.contextMenuPopup;
+  let oneOffButton = oneOffInstance.buttons;
+
+  // Get the one-off button for the test engine.
+  for (
+    oneOffButton = oneOffButton.firstChild;
+    oneOffButton;
+    oneOffButton = oneOffButton.nextSibling
+  ) {
+    if (
+      oneOffButton.nodeType == Node.ELEMENT_NODE &&
+      oneOffButton.engine &&
+      oneOffButton.engine.name == engineName
+    ) {
+      break;
+    }
+  }
+
+  Assert.notEqual(
+    oneOffButton,
+    undefined,
+    "One-off for test engine should exist"
+  );
+  Assert.equal(
+    oneOffButton.getAttribute("tooltiptext"),
+    engineName,
+    "One-off should have the tooltip set to the engine name"
+  );
+
+  Assert.ok(
+    oneOffButton.id.startsWith(baseId + "engine-"),
+    "Should have an appropriate id"
+  );
+
+  // Open the context menu on the one-off.
+  let promise = BrowserTestUtils.waitForEvent(contextMenu, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(
+    oneOffButton,
+    {
+      type: "contextmenu",
+      button: 2,
+    },
+    win
+  );
+  await promise;
+
+  return oneOffButton;
+}
+
+/**
+ * Closes the popup and moves the mouse away from it.
+ *
+ * @param {Button} popup The popup to close.
+ */
+async function promiseClosePopup(popup) {
+  // close the panel using the escape key.
+  let promise = promiseEvent(popup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Escape", {}, popup.ownerGlobal);
+  await promise;
+
+  // Move the cursor out of the panel area to avoid messing with other tests.
+  EventUtils.synthesizeNativeMouseEvent({
+    type: "mousemove",
+    target: popup,
+    offsetX: 0,
+    offsetY: 0,
+    win: popup.ownerGlobal,
+  });
+}
diff --git a/browser/components/search/test/browser/browser_private_search_perwindowpb.js b/browser/components/search/test/browser/browser_private_search_perwindowpb.js
new file mode 100644
index 0000000000..f0617ea7d4
--- /dev/null
+++ b/browser/components/search/test/browser/browser_private_search_perwindowpb.js
@@ -0,0 +1,84 @@
+// This test performs a search in a public window, then a different
+// search in a private window, and then checks in the public window
+// whether there is an autocomplete entry for the private search.
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + "426329.xml",
+    setAsDefault: true,
+  });
+
+  registerCleanupFunction(async () => {
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function () {
+  let windowsToClose = [];
+
+  function performSearch(aWin, aIsPrivate) {
+    let searchBar = aWin.BrowserSearch.searchBar;
+    ok(searchBar, "got search bar");
+
+    let loadPromise = BrowserTestUtils.browserLoaded(
+      aWin.gBrowser.selectedBrowser
+    );
+
+    searchBar.value = aIsPrivate ? "private test" : "public test";
+    searchBar.focus();
+    EventUtils.synthesizeKey("VK_RETURN", {}, aWin);
+
+    return loadPromise;
+  }
+
+  async function testOnWindow(aIsPrivate) {
+    let win = await BrowserTestUtils.openNewBrowserWindow({
+      private: aIsPrivate,
+    });
+    await SimpleTest.promiseFocus(win);
+    windowsToClose.push(win);
+    return win;
+  }
+
+  let newWindow = await testOnWindow(false);
+  await performSearch(newWindow, false);
+
+  newWindow = await testOnWindow(true);
+  await performSearch(newWindow, true);
+
+  newWindow = await testOnWindow(false);
+
+  let searchBar = newWindow.BrowserSearch.searchBar;
+  searchBar.value = "p";
+  searchBar.focus();
+
+  let popup = searchBar.textbox.popup;
+  let popupPromise = BrowserTestUtils.waitForEvent(popup, "popupshown");
+  searchBar.textbox.showHistoryPopup();
+  await popupPromise;
+
+  let entries = getMenuEntries(searchBar);
+  for (let i = 0; i < entries.length; i++) {
+    isnot(
+      entries[i],
+      "private test",
+      "shouldn't see private autocomplete entries"
+    );
+  }
+
+  searchBar.textbox.toggleHistoryPopup();
+  searchBar.value = "";
+
+  windowsToClose.forEach(function (win) {
+    win.close();
+  });
+});
+
+function getMenuEntries(searchBar) {
+  // Could perhaps pull values directly from the controller, but it seems
+  // more reliable to test the values that are actually in the richlistbox?
+  return Array.from(searchBar.textbox.popup.richlistbox.itemChildren, item =>
+    item.getAttribute("ac-value")
+  );
+}
diff --git a/browser/components/search/test/browser/browser_rich_suggestions.js b/browser/components/search/test/browser/browser_rich_suggestions.js
new file mode 100644
index 0000000000..98adedcee5
--- /dev/null
+++ b/browser/components/search/test/browser/browser_rich_suggestions.js
@@ -0,0 +1,125 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const CONFIG_DEFAULT = [
+  {
+    webExtension: { id: "basic@search.mozilla.org" },
+    urls: {
+      trending: {
+        fullPath:
+          "https://example.com/browser/browser/components/search/test/browser/trendingSuggestionEngine.sjs?richsuggestions=true",
+        query: "",
+      },
+    },
+    appliesTo: [{ included: { everywhere: true } }],
+    default: "yes",
+  },
+];
+
+SearchTestUtils.init(this);
+
+add_setup(async () => {
+  // Use engines in test directory
+  let searchExtensions = getChromeDir(getResolvedURI(gTestPath));
+  searchExtensions.append("search-engines");
+  await SearchTestUtils.useMochitestEngines(searchExtensions);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.searches", true],
+      ["browser.urlbar.trending.featureGate", true],
+      ["browser.urlbar.trending.requireSearchMode", false],
+      // Bug 1775917: Disable the persisted-search-terms search tip because if
+      // not dismissed, it can cause issues with other search tests.
+      ["browser.urlbar.tipShownCount.searchTip_persist", 999],
+    ],
+  });
+
+  SearchTestUtils.useMockIdleService();
+  await SearchTestUtils.updateRemoteSettingsConfig(CONFIG_DEFAULT);
+
+  registerCleanupFunction(async () => {
+    let settingsWritten = SearchTestUtils.promiseSearchNotification(
+      "write-settings-to-disk-complete"
+    );
+    await SearchTestUtils.updateRemoteSettingsConfig();
+    await settingsWritten;
+  });
+});
+
+add_task(async function test_trending_results() {
+  await check_results({ featureEnabled: true });
+  await check_results({ featureEnabled: false });
+});
+
+async function check_results({ featureEnabled = false }) {
+  Services.telemetry.clearEvents();
+  Services.telemetry.clearScalars();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.urlbar.richSuggestions.featureGate", featureEnabled]],
+  });
+
+  await UrlbarTestUtils.promiseAutocompleteResultPopup({
+    window,
+    value: "",
+    waitForFocus: SimpleTest.waitForFocus,
+  });
+
+  let numResults = UrlbarTestUtils.getResultCount(window);
+
+  for (let i = 0; i < numResults; i++) {
+    let { result } = await UrlbarTestUtils.getDetailsOfResultAt(window, i);
+    Assert.equal(result.type, UrlbarUtils.RESULT_TYPE.SEARCH);
+    Assert.equal(result.providerName, "SearchSuggestions");
+    Assert.equal(result.payload.engine, "basic");
+    Assert.equal(result.isRichSuggestion, featureEnabled);
+    if (featureEnabled) {
+      Assert.equal(typeof result.payload.description, "string");
+      Assert.ok(result.payload.icon.startsWith("data:"));
+    }
+  }
+
+  info("Select first remote search suggestion & hit Enter.");
+  EventUtils.synthesizeKey("KEY_ArrowDown", {}, window);
+  EventUtils.synthesizeKey("VK_RETURN", {}, window);
+
+  let scalars = TelemetryTestUtils.getProcessScalars("parent", false, true);
+  TelemetryTestUtils.assertScalar(scalars, "urlbar.engagement", 1);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_richsuggestion_deduplication() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.urlbar.richSuggestions.featureGate", true]],
+  });
+
+  await UrlbarTestUtils.promiseAutocompleteResultPopup({
+    window,
+    value: "test0",
+    waitForFocus: SimpleTest.waitForFocus,
+  });
+
+  let { result: heuristicResult } = await UrlbarTestUtils.getDetailsOfResultAt(
+    window,
+    0
+  );
+  let { result: richResult } = await UrlbarTestUtils.getDetailsOfResultAt(
+    window,
+    1
+  );
+
+  // The Rich Suggestion that points to the same query as the Hueristic result
+  // should not be deduplicated.
+  Assert.equal(heuristicResult.type, UrlbarUtils.RESULT_TYPE.SEARCH);
+  Assert.equal(heuristicResult.providerName, "HeuristicFallback");
+  Assert.equal(richResult.type, UrlbarUtils.RESULT_TYPE.SEARCH);
+  Assert.equal(richResult.providerName, "SearchSuggestions");
+  Assert.equal(
+    heuristicResult.payload.query,
+    richResult.payload.lowerCaseSuggestion
+  );
+
+  await UrlbarTestUtils.promisePopupClose(window);
+});
diff --git a/browser/components/search/test/browser/browser_searchEngine_behaviors.js b/browser/components/search/test/browser/browser_searchEngine_behaviors.js
new file mode 100644
index 0000000000..15a30583bf
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchEngine_behaviors.js
@@ -0,0 +1,223 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Test search plugin URLs
+ */
+
+"use strict";
+
+const SEARCH_ENGINE_DETAILS = [
+  {
+    alias: "a",
+    baseURL:
+      "https://www.amazon.com/s?tag=admarketus-20&ref=pd_sl_a71c226e8a96bfdb7ae5bc6d1f30e9e88d9e4e3436d7bfb941a95d0a&mfadid=adm&k=foo",
+    codes: {
+      context: "",
+      keyword: "",
+      newTab: "",
+      submission: "",
+    },
+    name: "Amazon.com",
+  },
+  {
+    alias: "b",
+    baseURL: `https://www.bing.com/search?{code}pc=${
+      SearchUtils.MODIFIED_APP_CHANNEL == "esr" ? "MOZR" : "MOZI"
+    }&q=foo`,
+    codes: {
+      context: "form=MOZCON&",
+      keyword: "form=MOZLBR&",
+      newTab: "form=MOZTSB&",
+      submission: "form=MOZSBR&",
+    },
+    name: "Bing",
+  },
+  {
+    alias: "d",
+    baseURL: `https://duckduckgo.com/?{code}t=${
+      SearchUtils.MODIFIED_APP_CHANNEL == "esr" ? "ftsa" : "ffab"
+    }&q=foo`,
+    codes: {
+      context: "",
+      keyword: "",
+      newTab: "",
+      submission: "",
+    },
+    name: "DuckDuckGo",
+  },
+  {
+    alias: "e",
+    baseURL:
+      "https://www.ebay.com/sch/?toolid=20004&campid=5338192028&mkevt=1&mkcid=1&mkrid=711-53200-19255-0&kw=foo",
+    codes: {
+      context: "",
+      keyword: "",
+      newTab: "",
+      submission: "",
+    },
+    name: "eBay",
+  },
+  // {
+  // TODO: Google is tested in browser_google_behaviors.js - we can't test it here
+  // yet because of bug 1315953.
+  //   alias: "g",
+  //   baseURL: "https://www.google.com/search?q=foo&ie=utf-8&oe=utf-8",
+  //   codes: {
+  //     context: "",
+  //     keyword: "",
+  //     newTab: "",
+  //     submission: "",
+  //   },
+  //   name: "Google",
+  // },
+];
+
+function promiseContentSearchReady(browser) {
+  return SpecialPowers.spawn(browser, [], async function (args) {
+    SpecialPowers.pushPrefEnv({
+      set: [
+        [
+          "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar",
+          false,
+        ],
+      ],
+    });
+    await ContentTaskUtils.waitForCondition(
+      () =>
+        content.wrappedJSObject.gContentSearchController &&
+        content.wrappedJSObject.gContentSearchController.defaultEngine
+    );
+  });
+}
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+  registerCleanupFunction(() => {
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+for (let engine of SEARCH_ENGINE_DETAILS) {
+  add_task(async function () {
+    let previouslySelectedEngine = await Services.search.getDefault();
+
+    registerCleanupFunction(async function () {
+      await Services.search.setDefault(
+        previouslySelectedEngine,
+        Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+      );
+    });
+
+    await testSearchEngine(engine);
+  });
+}
+
+async function testSearchEngine(engineDetails) {
+  let engine = Services.search.getEngineByName(engineDetails.name);
+  Assert.ok(engine, `${engineDetails.name} is installed`);
+
+  await Services.search.setDefault(
+    engine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  engine.alias = engineDetails.alias;
+
+  let base = engineDetails.baseURL;
+
+  // Test search URLs (including purposes).
+  let url = engine.getSubmission("foo").uri.spec;
+  Assert.equal(
+    url,
+    base.replace("{code}", engineDetails.codes.submission),
+    "Check search URL for 'foo'"
+  );
+  let sb = BrowserSearch.searchBar;
+
+  let engineTests = [
+    {
+      name: "context menu search",
+      searchURL: base.replace("{code}", engineDetails.codes.context),
+      run() {
+        // Simulate a contextmenu search
+        // FIXME: This is a bit "low-level"...
+        BrowserSearch._loadSearch(
+          "foo",
+          false,
+          false,
+          "contextmenu",
+          Services.scriptSecurityManager.getSystemPrincipal()
+        );
+      },
+    },
+    {
+      name: "keyword search",
+      searchURL: base.replace("{code}", engineDetails.codes.keyword),
+      run() {
+        gURLBar.value = "? foo";
+        gURLBar.focus();
+        EventUtils.synthesizeKey("KEY_Enter");
+      },
+    },
+    {
+      name: "keyword search with alias",
+      searchURL: base.replace("{code}", engineDetails.codes.keyword),
+      run() {
+        gURLBar.value = `${engineDetails.alias} foo`;
+        gURLBar.focus();
+        EventUtils.synthesizeKey("KEY_Enter");
+      },
+    },
+    {
+      name: "search bar search",
+      searchURL: base.replace("{code}", engineDetails.codes.submission),
+      run() {
+        sb.focus();
+        sb.value = "foo";
+        EventUtils.synthesizeKey("KEY_Enter");
+      },
+    },
+    {
+      name: "new tab search",
+      searchURL: base.replace("{code}", engineDetails.codes.newTab),
+      async preTest(tab) {
+        let browser = tab.linkedBrowser;
+        BrowserTestUtils.startLoadingURIString(browser, "about:newtab");
+
+        await BrowserTestUtils.browserLoaded(browser, false, "about:newtab");
+        await promiseContentSearchReady(browser);
+      },
+      async run(tab) {
+        await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+          let input = content.document.querySelector("input[id*=search-]");
+          input.focus();
+          input.value = "foo";
+        });
+        EventUtils.synthesizeKey("KEY_Enter");
+      },
+    },
+  ];
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  for (let test of engineTests) {
+    info(`Running: ${test.name}`);
+
+    if (test.preTest) {
+      await test.preTest(tab);
+    }
+
+    let promises = [
+      BrowserTestUtils.waitForDocLoadAndStopIt(test.searchURL, tab),
+      BrowserTestUtils.browserStopped(tab.linkedBrowser, test.searchURL, true),
+    ];
+
+    await test.run(tab);
+
+    await Promise.all(promises);
+  }
+
+  engine.alias = undefined;
+  sb.value = "";
+  BrowserTestUtils.removeTab(tab);
+}
diff --git a/browser/components/search/test/browser/browser_search_annotation.js b/browser/components/search/test/browser/browser_search_annotation.js
new file mode 100644
index 0000000000..991646657e
--- /dev/null
+++ b/browser/components/search/test/browser/browser_search_annotation.js
@@ -0,0 +1,176 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test whether a visit information is annotated correctly when searching on searchbar.
+
+ChromeUtils.defineESModuleGetters(this, {
+  PlacesTestUtils: "resource://testing-common/PlacesTestUtils.sys.mjs",
+});
+
+const FRECENCY = {
+  SEARCHED: 100,
+  BOOKMARKED: 175,
+};
+
+const { VISIT_SOURCE_BOOKMARKED, VISIT_SOURCE_SEARCHED } = PlacesUtils.history;
+
+async function assertDatabase({ targetURL, expected }) {
+  const frecency = await PlacesTestUtils.getDatabaseValue(
+    "moz_places",
+    "frecency",
+    { url: targetURL }
+  );
+  Assert.equal(frecency, expected.frecency, "Frecency is correct");
+
+  const placesId = await PlacesTestUtils.getDatabaseValue("moz_places", "id", {
+    url: targetURL,
+  });
+  const db = await PlacesUtils.promiseDBConnection();
+  const rows = await db.execute(
+    "SELECT source, triggeringPlaceId FROM moz_historyvisits WHERE place_id = :place_id AND source = :source",
+    {
+      place_id: placesId,
+      source: expected.source,
+    }
+  );
+  Assert.equal(rows.length, 1);
+  Assert.equal(
+    rows[0].getResultByName("triggeringPlaceId"),
+    null,
+    `The triggeringPlaceId in database is correct for ${targetURL}`
+  );
+}
+
+add_setup(async function () {
+  await PlacesUtils.history.clear();
+  await PlacesUtils.bookmarks.eraseEverything();
+
+  await gCUITestUtils.addSearchBar();
+  await SearchTestUtils.installSearchExtension(
+    {
+      name: "Example",
+      keyword: "@test",
+    },
+    { setAsDefault: true }
+  );
+
+  registerCleanupFunction(async function () {
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function basic() {
+  const testData = [
+    {
+      description: "Normal search",
+      input: "abc",
+      resultURL: "https://example.com/?q=abc",
+      expected: {
+        source: VISIT_SOURCE_SEARCHED,
+        frecency: FRECENCY.SEARCHED,
+      },
+    },
+    {
+      description: "Search but the url is bookmarked",
+      input: "abc",
+      resultURL: "https://example.com/?q=abc",
+      bookmarks: [
+        {
+          parentGuid: PlacesUtils.bookmarks.toolbarGuid,
+          url: Services.io.newURI("https://example.com/?q=abc"),
+          title: "test bookmark",
+        },
+      ],
+      expected: {
+        source: VISIT_SOURCE_BOOKMARKED,
+        frecency: FRECENCY.BOOKMARKED,
+      },
+    },
+  ];
+
+  for (const {
+    description,
+    input,
+    resultURL,
+    bookmarks,
+    expected,
+  } of testData) {
+    info(description);
+
+    for (const bookmark of bookmarks || []) {
+      await PlacesUtils.bookmarks.insert(bookmark);
+    }
+
+    const onLoad = BrowserTestUtils.browserLoaded(
+      gBrowser.selectedBrowser,
+      false,
+      resultURL
+    );
+    await searchInSearchbar(input);
+    let promiseVisited = PlacesTestUtils.waitForNotification(
+      "page-visited",
+      events => events.some(e => e.url == resultURL)
+    );
+    EventUtils.synthesizeKey("KEY_Enter");
+    await onLoad;
+    await promiseVisited;
+    await assertDatabase({ targetURL: resultURL, expected });
+
+    await PlacesUtils.history.clear();
+    await PlacesUtils.bookmarks.eraseEverything();
+  }
+});
+
+add_task(async function contextmenu() {
+  await BrowserTestUtils.withNewTab(
+    "https://example.com/browser/browser/components/search/test/browser/test_search.html",
+    async () => {
+      // Select html content.
+      await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+        await new Promise(resolve => {
+          content.document.addEventListener("selectionchange", resolve, {
+            once: true,
+          });
+          content.document
+            .getSelection()
+            .selectAllChildren(content.document.body);
+        });
+      });
+
+      const onPopup = BrowserTestUtils.waitForEvent(document, "popupshown");
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        "#id",
+        { type: "contextmenu" },
+        gBrowser.selectedBrowser
+      );
+      await onPopup;
+
+      const targetURL = "https://example.com/?q=test%2520search";
+      const onLoad = BrowserTestUtils.waitForNewTab(gBrowser, targetURL, true);
+      const contextMenu = document.getElementById("contentAreaContextMenu");
+      const openLinkMenuItem = contextMenu.querySelector(
+        "#context-searchselect"
+      );
+      let promiseVisited = PlacesTestUtils.waitForNotification(
+        "page-visited",
+        events => events.some(e => e.url == targetURL)
+      );
+      contextMenu.activateItem(openLinkMenuItem);
+      const tab = await onLoad;
+      await promiseVisited;
+      await assertDatabase({
+        targetURL,
+        expected: {
+          source: VISIT_SOURCE_SEARCHED,
+          frecency: FRECENCY.SEARCHED,
+        },
+      });
+
+      BrowserTestUtils.removeTab(tab);
+      await PlacesUtils.history.clear();
+      await PlacesUtils.bookmarks.eraseEverything();
+    }
+  );
+});
diff --git a/browser/components/search/test/browser/browser_search_discovery.js b/browser/components/search/test/browser/browser_search_discovery.js
new file mode 100644
index 0000000000..92f7a252f8
--- /dev/null
+++ b/browser/components/search/test/browser/browser_search_discovery.js
@@ -0,0 +1,132 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
+
+// Bug 1588193 - BrowserTestUtils.waitForContentEvent now resolves slightly
+// earlier than before, so it no longer suffices to only wait for a single event
+// tick before checking if browser.engines has been updated. Instead we use a 1s
+// timeout, which may cause the test to take more time.
+requestLongerTimeout(2);
+
+add_task(async function () {
+  let url =
+    "http://mochi.test:8888/browser/browser/components/search/test/browser/discovery.html";
+  info("Test search discovery");
+  await BrowserTestUtils.withNewTab(url, searchDiscovery);
+});
+
+let searchDiscoveryTests = [
+  { text: "rel search discovered" },
+  { rel: "SEARCH", text: "rel is case insensitive" },
+  { rel: "-search-", pass: false, text: "rel -search- not discovered" },
+  {
+    rel: "foo bar baz search quux",
+    text: "rel may contain additional rels separated by spaces",
+  },
+  { href: "https://not.mozilla.com", text: "HTTPS ok" },
+  { href: "data:text/foo,foo", pass: false, text: "data URI not permitted" },
+  { href: "javascript:alert(0)", pass: false, text: "JS URI not permitted" },
+  {
+    type: "APPLICATION/OPENSEARCHDESCRIPTION+XML",
+    text: "type is case insensitve",
+  },
+  {
+    type: " application/opensearchdescription+xml ",
+    text: "type may contain extra whitespace",
+  },
+  {
+    type: "application/opensearchdescription+xml; charset=utf-8",
+    text: "type may have optional parameters (RFC2046)",
+  },
+  {
+    type: "aapplication/opensearchdescription+xml",
+    pass: false,
+    text: "type should not be loosely matched",
+  },
+  {
+    rel: "search search search",
+    count: 1,
+    text: "only one engine should be added",
+  },
+];
+
+async function searchDiscovery() {
+  let browser = gBrowser.selectedBrowser;
+
+  for (let testCase of searchDiscoveryTests) {
+    if (testCase.pass == undefined) {
+      testCase.pass = true;
+    }
+    testCase.title = testCase.title || searchDiscoveryTests.indexOf(testCase);
+
+    let promiseLinkAdded = BrowserTestUtils.waitForContentEvent(
+      gBrowser.selectedBrowser,
+      "DOMLinkAdded",
+      false,
+      null,
+      true
+    );
+
+    await SpecialPowers.spawn(gBrowser.selectedBrowser, [testCase], test => {
+      let doc = content.document;
+      let head = doc.getElementById("linkparent");
+      let link = doc.createElement("link");
+      link.rel = test.rel || "search";
+      link.href = test.href || "https://so.not.here.mozilla.com/search.xml";
+      link.type = test.type || "application/opensearchdescription+xml";
+      link.title = test.title;
+      head.appendChild(link);
+    });
+
+    await promiseLinkAdded;
+    await new Promise(resolve => setTimeout(resolve, 1000));
+
+    if (browser.engines) {
+      info(`Found ${browser.engines.length} engines`);
+      info(`First engine title: ${browser.engines[0].title}`);
+      let hasEngine = testCase.count
+        ? browser.engines[0].title == testCase.title &&
+          browser.engines.length == testCase.count
+        : browser.engines[0].title == testCase.title;
+      ok(hasEngine, testCase.text);
+      browser.engines = null;
+    } else {
+      ok(!testCase.pass, testCase.text);
+    }
+  }
+
+  info("Test multiple engines with the same title");
+  let promiseLinkAdded = BrowserTestUtils.waitForContentEvent(
+    gBrowser.selectedBrowser,
+    "DOMLinkAdded",
+    false,
+    e => e.target.href == "https://second.mozilla.com/search.xml",
+    true
+  );
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let doc = content.document;
+    let head = doc.getElementById("linkparent");
+    let link = doc.createElement("link");
+    link.rel = "search";
+    link.href = "https://first.mozilla.com/search.xml";
+    link.type = "application/opensearchdescription+xml";
+    link.title = "Test Engine";
+    let link2 = link.cloneNode(false);
+    link2.href = "https://second.mozilla.com/search.xml";
+    head.appendChild(link);
+    head.appendChild(link2);
+  });
+
+  await promiseLinkAdded;
+  await new Promise(resolve => setTimeout(resolve, 1000));
+
+  ok(browser.engines, "has engines");
+  is(browser.engines.length, 1, "only one engine");
+  is(
+    browser.engines[0].uri,
+    "https://first.mozilla.com/search.xml",
+    "first engine wins"
+  );
+  browser.engines = null;
+}
diff --git a/browser/components/search/test/browser/browser_search_nimbus_reload.js b/browser/components/search/test/browser/browser_search_nimbus_reload.js
new file mode 100644
index 0000000000..19247c9a02
--- /dev/null
+++ b/browser/components/search/test/browser/browser_search_nimbus_reload.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { ExperimentFakes } = ChromeUtils.importESModule(
+  "resource://testing-common/NimbusTestUtils.sys.mjs"
+);
+
+const { SearchService } = ChromeUtils.importESModule(
+  "resource://gre/modules/SearchService.sys.mjs"
+);
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+
+add_task(async function test_engines_reloaded_nimbus() {
+  let reloadSpy = sinon.spy(SearchService.prototype, "_maybeReloadEngines");
+  let getVariableSpy = sinon.spy(
+    NimbusFeatures.searchConfiguration,
+    "getVariable"
+  );
+
+  let doExperimentCleanup = await ExperimentFakes.enrollWithFeatureConfig({
+    featureId: "searchConfiguration",
+    value: { experiment: "nimbus-search-mochitest" },
+  });
+
+  Assert.equal(reloadSpy.callCount, 1, "Called by experiment enrollment");
+  await BrowserTestUtils.waitForCondition(
+    () => getVariableSpy.calledWith("experiment"),
+    "Wait for SearchService update to run"
+  );
+  Assert.equal(
+    getVariableSpy.callCount,
+    3,
+    "Called by update function to fetch engines"
+  );
+  Assert.ok(
+    getVariableSpy.calledWith("experiment"),
+    "Called by search service observer"
+  );
+  Assert.equal(
+    NimbusFeatures.searchConfiguration.getVariable("experiment"),
+    "nimbus-search-mochitest",
+    "Should have expected value"
+  );
+
+  await doExperimentCleanup();
+
+  Assert.equal(reloadSpy.callCount, 2, "Called by experiment unenrollment");
+
+  reloadSpy.restore();
+  getVariableSpy.restore();
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_addEngine.js b/browser/components/search/test/browser/browser_searchbar_addEngine.js
new file mode 100644
index 0000000000..7d72d63dab
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_addEngine.js
@@ -0,0 +1,99 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests the Add Search Engine option in the search bar.
+ */
+
+"use strict";
+
+const { PromptTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromptTestUtils.sys.mjs"
+);
+
+const searchPopup = document.getElementById("PopupSearchAutoComplete");
+let searchbar;
+
+add_setup(async function () {
+  searchbar = await gCUITestUtils.addSearchBar();
+
+  registerCleanupFunction(async function () {
+    gCUITestUtils.removeSearchBar();
+    Services.search.restoreDefaultEngines();
+  });
+});
+
+add_task(async function test_invalidEngine() {
+  let rootDir = getRootDirectory(gTestPath);
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    rootDir + "opensearch.html"
+  );
+  let promise = promiseEvent(searchPopup, "popupshown");
+  await EventUtils.synthesizeMouseAtCenter(
+    searchbar.querySelector(".searchbar-search-button"),
+    {}
+  );
+  await promise;
+
+  let addEngineList = searchPopup.querySelectorAll(
+    ".searchbar-engine-one-off-add-engine"
+  );
+  let item = addEngineList[addEngineList.length - 1];
+
+  await TestUtils.waitForCondition(
+    () => item.tooltipText.includes("engineInvalid"),
+    "Wait until the tooltip will be correct"
+  );
+  Assert.ok(true, "Last item should be the invalid entry");
+
+  let promptPromise = PromptTestUtils.waitForPrompt(tab.linkedBrowser, {
+    modalType: Ci.nsIPromptService.MODAL_TYPE_CONTENT,
+    promptType: "alert",
+  });
+
+  await EventUtils.synthesizeMouseAtCenter(item, {});
+
+  let prompt = await promptPromise;
+
+  Assert.ok(
+    prompt.ui.infoBody.textContent.includes(
+      "http://mochi.test:8888/browser/browser/components/search/test/browser/testEngine_404.xml"
+    ),
+    "Should have included the url in the prompt body"
+  );
+
+  await PromptTestUtils.handlePrompt(prompt);
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_onOnlyDefaultEngine() {
+  info("Remove engines except default");
+  const defaultEngine = Services.search.defaultEngine;
+  const engines = await Services.search.getVisibleEngines();
+  for (const engine of engines) {
+    if (defaultEngine.name !== engine.name) {
+      await Services.search.removeEngine(engine);
+    }
+  }
+
+  info("Show popup");
+  const rootDir = getRootDirectory(gTestPath);
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    rootDir + "opensearch.html"
+  );
+  const onShown = promiseEvent(searchPopup, "popupshown");
+  await EventUtils.synthesizeMouseAtCenter(
+    searchbar.querySelector(".searchbar-search-button"),
+    {}
+  );
+  await onShown;
+
+  const addEngineList = searchPopup.querySelectorAll(
+    ".searchbar-engine-one-off-add-engine"
+  );
+  Assert.equal(addEngineList.length, 3, "Add engines should be shown");
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_context.js b/browser/components/search/test/browser/browser_searchbar_context.js
new file mode 100644
index 0000000000..4a3d20fc50
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_context.js
@@ -0,0 +1,246 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests the context menu for the search bar.
+ */
+
+"use strict";
+
+let win;
+
+XPCOMUtils.defineLazyServiceGetter(
+  this,
+  "clipboardHelper",
+  "@mozilla.org/widget/clipboardhelper;1",
+  "nsIClipboardHelper"
+);
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+
+  await SearchTestUtils.installSearchExtension({}, { setAsDefault: true });
+
+  win = await BrowserTestUtils.openNewBrowserWindow();
+
+  // Disable suggestions for this test, so that we are not attempting to hit
+  // the network for suggestions when we don't need them.
+  SpecialPowers.pushPrefEnv({
+    set: [["browser.search.suggest.enabled", false]],
+  });
+
+  registerCleanupFunction(async function () {
+    await BrowserTestUtils.closeWindow(win);
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function test_emptybar() {
+  const searchbar = win.BrowserSearch.searchBar;
+  searchbar.focus();
+
+  let contextMenu = searchbar.querySelector(".textbox-contextmenu");
+  let contextMenuPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popupshown"
+  );
+
+  await EventUtils.synthesizeMouseAtCenter(
+    searchbar,
+    { type: "contextmenu", button: 2 },
+    win
+  );
+  await contextMenuPromise;
+
+  Assert.ok(
+    contextMenu.getElementsByAttribute("cmd", "cmd_cut")[0].disabled,
+    "Should have disabled the cut menuitem"
+  );
+  Assert.ok(
+    contextMenu.getElementsByAttribute("cmd", "cmd_copy")[0].disabled,
+    "Should have disabled the copy menuitem"
+  );
+  Assert.ok(
+    contextMenu.getElementsByAttribute("cmd", "cmd_delete")[0].disabled,
+    "Should have disabled the delete menuitem"
+  );
+
+  let popupHiddenPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popuphidden"
+  );
+  contextMenu.hidePopup();
+  await popupHiddenPromise;
+});
+
+add_task(async function test_text_in_bar() {
+  const searchbar = win.BrowserSearch.searchBar;
+  searchbar.focus();
+
+  searchbar.value = "Test";
+  searchbar._textbox.editor.selectAll();
+
+  let contextMenu = searchbar.querySelector(".textbox-contextmenu");
+  let contextMenuPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popupshown"
+  );
+
+  await EventUtils.synthesizeMouseAtCenter(
+    searchbar,
+    { type: "contextmenu", button: 2 },
+    win
+  );
+  await contextMenuPromise;
+
+  Assert.ok(
+    !contextMenu.getElementsByAttribute("cmd", "cmd_cut")[0].disabled,
+    "Should have enabled the cut menuitem"
+  );
+  Assert.ok(
+    !contextMenu.getElementsByAttribute("cmd", "cmd_copy")[0].disabled,
+    "Should have enabled the copy menuitem"
+  );
+  Assert.ok(
+    !contextMenu.getElementsByAttribute("cmd", "cmd_delete")[0].disabled,
+    "Should have enabled the delete menuitem"
+  );
+
+  let popupHiddenPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popuphidden"
+  );
+  contextMenu.hidePopup();
+  await popupHiddenPromise;
+});
+
+add_task(async function test_unfocused_emptybar() {
+  const searchbar = win.BrowserSearch.searchBar;
+  // clear searchbar value from previous test
+  searchbar.value = "";
+
+  // force focus onto another component
+  win.gURLBar.focus();
+
+  let contextMenu = searchbar.querySelector(".textbox-contextmenu");
+  let contextMenuPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popupshown"
+  );
+
+  searchbar.focus();
+  await EventUtils.synthesizeMouseAtCenter(
+    searchbar,
+    { type: "contextmenu", button: 2 },
+    win
+  );
+  await contextMenuPromise;
+
+  Assert.ok(
+    contextMenu.getElementsByAttribute("cmd", "cmd_cut")[0].disabled,
+    "Should have disabled the cut menuitem"
+  );
+  Assert.ok(
+    contextMenu.getElementsByAttribute("cmd", "cmd_copy")[0].disabled,
+    "Should have disabled the copy menuitem"
+  );
+  Assert.ok(
+    contextMenu.getElementsByAttribute("cmd", "cmd_delete")[0].disabled,
+    "Should have disabled the delete menuitem"
+  );
+
+  let popupHiddenPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popuphidden"
+  );
+  contextMenu.hidePopup();
+  await popupHiddenPromise;
+});
+
+add_task(async function test_text_in_unfocused_bar() {
+  const searchbar = win.BrowserSearch.searchBar;
+
+  searchbar.value = "Test";
+
+  // force focus onto another component
+  win.gURLBar.focus();
+
+  let contextMenu = searchbar.querySelector(".textbox-contextmenu");
+  let contextMenuPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popupshown"
+  );
+
+  searchbar.focus();
+  await EventUtils.synthesizeMouseAtCenter(
+    searchbar,
+    { type: "contextmenu", button: 2 },
+    win
+  );
+  await contextMenuPromise;
+
+  Assert.ok(
+    !contextMenu.getElementsByAttribute("cmd", "cmd_cut")[0].disabled,
+    "Should have enabled the cut menuitem"
+  );
+  Assert.ok(
+    !contextMenu.getElementsByAttribute("cmd", "cmd_copy")[0].disabled,
+    "Should have enabled the copy menuitem"
+  );
+  Assert.ok(
+    !contextMenu.getElementsByAttribute("cmd", "cmd_delete")[0].disabled,
+    "Should have enabled the delete menuitem"
+  );
+
+  let popupHiddenPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popuphidden"
+  );
+  contextMenu.hidePopup();
+  await popupHiddenPromise;
+});
+
+add_task(async function test_paste_and_go() {
+  let tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser: win.gBrowser,
+  });
+
+  const searchbar = win.BrowserSearch.searchBar;
+
+  searchbar.value = "";
+  searchbar.focus();
+
+  const searchString = "test";
+
+  await SimpleTest.promiseClipboardChange(searchString, () => {
+    clipboardHelper.copyString(searchString);
+  });
+
+  let contextMenu = searchbar.querySelector(".textbox-contextmenu");
+  let contextMenuPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popupshown"
+  );
+  await EventUtils.synthesizeMouseAtCenter(
+    searchbar,
+    { type: "contextmenu", button: 2 },
+    win
+  );
+  await contextMenuPromise;
+
+  let popupHiddenPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popuphidden"
+  );
+  let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  searchbar.querySelector(".searchbar-paste-and-search").click();
+  await p;
+  contextMenu.hidePopup();
+  await popupHiddenPromise;
+
+  Assert.equal(
+    tab.linkedBrowser.currentURI.spec,
+    `https://example.com/?q=${searchString}`,
+    "Should have loaded the expected search page."
+  );
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_default.js b/browser/components/search/test/browser/browser_searchbar_default.js
new file mode 100644
index 0000000000..c1e9280932
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_default.js
@@ -0,0 +1,221 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests the correct default engines in the search bar.
+ */
+
+"use strict";
+
+const { SearchSuggestionController } = ChromeUtils.importESModule(
+  "resource://gre/modules/SearchSuggestionController.sys.mjs"
+);
+
+const templateNormal = "https://example.com/?q=";
+const templatePrivate = "https://example.com/?query=";
+
+const searchPopup = document.getElementById("PopupSearchAutoComplete");
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.separatePrivateDefault", false]],
+  });
+
+  // Create two new search engines. Mark one as the default engine, so
+  // the test don't crash. We need to engines for this test as the searchbar
+  // doesn't display the default search engine among the one-off engines.
+  await SearchTestUtils.installSearchExtension({
+    name: "MozSearch1",
+    keyword: "mozalias",
+  });
+  await SearchTestUtils.installSearchExtension({
+    name: "MozSearch2",
+    keyword: "mozalias2",
+    search_url_get_params: "query={searchTerms}",
+  });
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault.ui.enabled", true],
+      ["browser.search.separatePrivateDefault", false],
+    ],
+  });
+
+  let originalEngine = await Services.search.getDefault();
+  let originalPrivateEngine = await Services.search.getDefaultPrivate();
+
+  let engineDefault = Services.search.getEngineByName("MozSearch1");
+  await Services.search.setDefault(
+    engineDefault,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  registerCleanupFunction(async function () {
+    gCUITestUtils.removeSearchBar();
+    await Services.search.setDefault(
+      originalEngine,
+      Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+    );
+    await Services.search.setDefaultPrivate(
+      originalPrivateEngine,
+      Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+    );
+  });
+});
+
+async function doSearch(
+  win,
+  tab,
+  engineName,
+  templateUrl,
+  inputText = "query"
+) {
+  await searchInSearchbar(inputText, win);
+
+  Assert.ok(
+    win.BrowserSearch.searchBar.textbox.popup.searchbarEngineName
+      .getAttribute("value")
+      .includes(engineName),
+    "Should have the correct engine name displayed in the bar"
+  );
+
+  let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  EventUtils.synthesizeKey("KEY_Enter", {}, win);
+  await p;
+
+  Assert.equal(
+    tab.linkedBrowser.currentURI.spec,
+    templateUrl + inputText,
+    "Should have loaded the expected search page."
+  );
+}
+
+add_task(async function test_default_search() {
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+
+  await doSearch(window, tab, "MozSearch1", templateNormal);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_default_search_private_no_separate() {
+  const win = await BrowserTestUtils.openNewBrowserWindow({ private: true });
+
+  await doSearch(win, win.gBrowser.selectedTab, "MozSearch1", templateNormal);
+
+  await BrowserTestUtils.closeWindow(win);
+});
+
+add_task(async function test_default_search_private_no_separate() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.separatePrivateDefault", true]],
+  });
+
+  await Services.search.setDefaultPrivate(
+    Services.search.getEngineByName("MozSearch2"),
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  const win = await BrowserTestUtils.openNewBrowserWindow({ private: true });
+
+  await doSearch(win, win.gBrowser.selectedTab, "MozSearch2", templatePrivate);
+
+  await BrowserTestUtils.closeWindow(win);
+});
+
+add_task(async function test_form_history() {
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+  await FormHistoryTestUtils.clear("searchbar-history");
+  const gShortString = new Array(
+    SearchSuggestionController.SEARCH_HISTORY_MAX_VALUE_LENGTH
+  )
+    .fill("a")
+    .join("");
+  let promiseAdd = TestUtils.topicObserved("satchel-storage-changed");
+  await doSearch(window, tab, "MozSearch1", templateNormal, gShortString);
+  await promiseAdd;
+  let entries = (await FormHistoryTestUtils.search("searchbar-history")).map(
+    entry => entry.value
+  );
+  Assert.deepEqual(
+    entries,
+    [gShortString],
+    "Should have stored search history"
+  );
+
+  await FormHistoryTestUtils.clear("searchbar-history");
+  const gLongString = new Array(
+    SearchSuggestionController.SEARCH_HISTORY_MAX_VALUE_LENGTH + 1
+  )
+    .fill("a")
+    .join("");
+  await doSearch(window, tab, "MozSearch1", templateNormal, gLongString);
+  // There's nothing we can wait for, since addition should not be happening.
+  /* eslint-disable mozilla/no-arbitrary-setTimeout */
+  await new Promise(resolve => setTimeout(resolve, 500));
+  entries = (await FormHistoryTestUtils.search("searchbar-history")).map(
+    entry => entry.value
+  );
+  Assert.deepEqual(entries, [], "Should not find form history");
+
+  await FormHistoryTestUtils.clear("searchbar-history");
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_searchbar_revert() {
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+
+  await doSearch(window, tab, "MozSearch1", templateNormal, "testQuery");
+
+  let searchbar = window.BrowserSearch.searchBar;
+  is(
+    searchbar.value,
+    "testQuery",
+    "Search value should be the the last search"
+  );
+
+  // focus search bar
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  searchbar.focus();
+  await promise;
+
+  searchbar.value = "aQuery";
+  searchbar.value = "anotherQuery";
+
+  // close the panel using the escape key.
+  promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Escape");
+  await promise;
+
+  is(searchbar.value, "anotherQuery", "The search value should be the same");
+  // revert the search bar value
+  EventUtils.synthesizeKey("KEY_Escape");
+  is(
+    searchbar.value,
+    "testQuery",
+    "The search value should have been reverted"
+  );
+
+  EventUtils.synthesizeKey("KEY_Escape");
+  is(searchbar.value, "testQuery", "The search value should be the same");
+
+  await doSearch(window, tab, "MozSearch1", templateNormal, "query");
+
+  is(searchbar.value, "query", "The search value should be query");
+  EventUtils.synthesizeKey("KEY_Escape");
+  is(searchbar.value, "query", "The search value should be the same");
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_enter.js b/browser/components/search/test/browser/browser_searchbar_enter.js
new file mode 100644
index 0000000000..030cf26fb2
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_enter.js
@@ -0,0 +1,152 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test the behavior for enter key.
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+
+  await SearchTestUtils.installSearchExtension({}, { setAsDefault: true });
+
+  registerCleanupFunction(async function () {
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function searchOnEnterSoon() {
+  info("Search on Enter as soon as typing a char");
+  const win = await BrowserTestUtils.openNewBrowserWindow();
+  const browser = win.gBrowser.selectedBrowser;
+  const browserSearch = win.BrowserSearch;
+
+  const onPageHide = SpecialPowers.spawn(browser, [], () => {
+    return new Promise(resolve => {
+      content.addEventListener("pagehide", () => {
+        resolve();
+      });
+    });
+  });
+  const onResult = SpecialPowers.spawn(browser, [], () => {
+    return new Promise(resolve => {
+      content.addEventListener("keyup", () => {
+        resolve("keyup");
+      });
+      content.addEventListener("unload", () => {
+        resolve("unload");
+      });
+    });
+  });
+
+  info("Focus on the search bar");
+  const searchBarTextBox = browserSearch.searchBar.textbox;
+  EventUtils.synthesizeMouseAtCenter(searchBarTextBox, {}, win);
+  const ownerDocument = browser.ownerDocument;
+  is(ownerDocument.activeElement, searchBarTextBox, "The search bar has focus");
+
+  info("Keydown a char and Enter");
+  EventUtils.synthesizeKey("x", { type: "keydown" }, win);
+  EventUtils.synthesizeKey("KEY_Enter", { type: "keydown" }, win);
+
+  info("Wait for pagehide event in the content");
+  await onPageHide;
+  is(
+    ownerDocument.activeElement,
+    searchBarTextBox,
+    "The search bar still has focus"
+  );
+
+  // Keyup both key as soon as pagehide event happens.
+  EventUtils.synthesizeKey("x", { type: "keyup" }, win);
+  EventUtils.synthesizeKey("KEY_Enter", { type: "keyup" }, win);
+
+  await TestUtils.waitForCondition(
+    () => ownerDocument.activeElement === browser,
+    "Wait for focus to be moved to the browser"
+  );
+  info("The focus is moved to the browser");
+
+  // Check whether keyup event is not captured before unload event happens.
+  const result = await onResult;
+  is(result, "unload", "Keyup event is not captured");
+
+  await BrowserTestUtils.closeWindow(win);
+});
+
+add_task(async function typeCharWhileProcessingEnter() {
+  info("Typing a char while processing enter key");
+  const win = await BrowserTestUtils.openNewBrowserWindow();
+  const browser = win.gBrowser.selectedBrowser;
+  const searchBar = win.BrowserSearch.searchBar;
+
+  const SEARCH_WORD = "test";
+  const onLoad = BrowserTestUtils.browserLoaded(
+    browser,
+    false,
+    `https://example.com/?q=${SEARCH_WORD}`
+  );
+  searchBar.textbox.focus();
+  searchBar.textbox.value = SEARCH_WORD;
+
+  info("Keydown Enter");
+  EventUtils.synthesizeKey("KEY_Enter", { type: "keydown" }, win);
+  await TestUtils.waitForCondition(
+    () => searchBar._needBrowserFocusAtEnterKeyUp,
+    "Wait for starting process for the enter key"
+  );
+
+  info("Keydown a char");
+  EventUtils.synthesizeKey("x", { type: "keydown" }, win);
+
+  info("Keyup both");
+  EventUtils.synthesizeKey("x", { type: "keyup" }, win);
+  EventUtils.synthesizeKey("KEY_Enter", { type: "keyup" }, win);
+
+  Assert.equal(
+    searchBar.textbox.value,
+    SEARCH_WORD,
+    "The value of searchbar is correct"
+  );
+
+  await onLoad;
+  Assert.ok("Browser loaded the correct url");
+
+  // Cleanup.
+  await BrowserTestUtils.closeWindow(win);
+});
+
+add_task(async function keyupEnterWhilePressingMeta() {
+  const win = await BrowserTestUtils.openNewBrowserWindow();
+  const browser = win.gBrowser.selectedBrowser;
+  const searchBar = win.BrowserSearch.searchBar;
+
+  info("Keydown Meta+Enter");
+  searchBar.textbox.focus();
+  searchBar.textbox.value = "";
+  EventUtils.synthesizeKey(
+    "KEY_Enter",
+    { type: "keydown", metaKey: true },
+    win
+  );
+
+  // Pressing Enter key while pressing Meta key, and next, even when releasing
+  // Enter key before releasing Meta key, the keyup event is not fired.
+  // Therefor, we fire Meta keyup event only.
+  info("Keyup Meta");
+  EventUtils.synthesizeKey("KEY_Meta", { type: "keyup" }, win);
+
+  await TestUtils.waitForCondition(
+    () => browser.ownerDocument.activeElement === browser,
+    "Wait for focus to be moved to the browser"
+  );
+  info("The focus is moved to the browser");
+
+  info("Check whether we can input on the search bar");
+  searchBar.textbox.focus();
+  EventUtils.synthesizeKey("a", {}, win);
+  is(searchBar.textbox.value, "a", "Can input a char");
+
+  // Cleanup.
+  await BrowserTestUtils.closeWindow(win);
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_keyboard_navigation.js b/browser/components/search/test/browser/browser_searchbar_keyboard_navigation.js
new file mode 100644
index 0000000000..ee292db1b5
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_keyboard_navigation.js
@@ -0,0 +1,663 @@
+// Tests that keyboard navigation in the search panel works as designed.
+
+const searchPopup = document.getElementById("PopupSearchAutoComplete");
+
+const kValues = ["foo1", "foo2", "foo3"];
+const kUserValue = "foo";
+
+function getOpenSearchItems() {
+  let os = [];
+
+  let addEngineList = searchPopup.searchOneOffsContainer.querySelector(
+    ".search-add-engines"
+  );
+  for (
+    let item = addEngineList.firstElementChild;
+    item;
+    item = item.nextElementSibling
+  ) {
+    os.push(item);
+  }
+
+  return os;
+}
+
+let searchbar;
+let textbox;
+
+async function checkHeader(engine) {
+  // The header can be updated after getting the engine, so we may have to
+  // wait for it.
+  let header = searchPopup.searchbarEngineName;
+  if (!header.getAttribute("value").includes(engine.name)) {
+    await new Promise(resolve => {
+      let observer = new MutationObserver(() => {
+        observer.disconnect();
+        resolve();
+      });
+      observer.observe(searchPopup.searchbarEngineName, {
+        attributes: true,
+        attributeFilter: ["value"],
+      });
+    });
+  }
+  Assert.ok(
+    header.getAttribute("value").includes(engine.name),
+    "Should have the correct engine name displayed in the header"
+  );
+}
+
+add_setup(async function () {
+  searchbar = await gCUITestUtils.addSearchBar();
+  textbox = searchbar.textbox;
+
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + "testEngine.xml",
+    setAsDefault: true,
+  });
+  // First cleanup the form history in case other tests left things there.
+  info("cleanup the search history");
+  await FormHistory.update({ op: "remove", fieldname: "searchbar-history" });
+
+  info("adding search history values: " + kValues);
+  let addOps = kValues.map(value => {
+    return { op: "add", fieldname: "searchbar-history", value };
+  });
+  await FormHistory.update(addOps);
+
+  textbox.value = kUserValue;
+
+  registerCleanupFunction(async () => {
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function test_arrows() {
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  searchbar.focus();
+  await promise;
+  is(
+    textbox.mController.searchString,
+    kUserValue,
+    "The search string should be 'foo'"
+  );
+
+  // Check the initial state of the panel before sending keyboard events.
+  is(searchPopup.matchCount, kValues.length, "There should be 3 suggestions");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // The tests will be less meaningful if the first, second, last, and
+  // before-last one-off buttons aren't different. We should always have more
+  // than 4 default engines, but it's safer to check this assumption.
+  let oneOffs = getOneOffs();
+  Assert.greaterOrEqual(
+    oneOffs.length,
+    4,
+    "we have at least 4 one-off buttons displayed"
+  );
+
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // The down arrow should first go through the suggestions.
+  for (let i = 0; i < kValues.length; ++i) {
+    EventUtils.synthesizeKey("KEY_ArrowDown");
+    is(
+      searchPopup.selectedIndex,
+      i,
+      "the suggestion at index " + i + " should be selected"
+    );
+    is(
+      textbox.value,
+      kValues[i],
+      "the textfield value should be " + kValues[i]
+    );
+    await checkHeader(Services.search.defaultEngine);
+  }
+
+  // Pressing down again should remove suggestion selection and change the text
+  // field value back to what the user typed, and select the first one-off.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(
+    textbox.value,
+    kUserValue,
+    "the textfield value should be back to initial value"
+  );
+
+  // now cycle through the one-off items, the first one is already selected.
+  for (let i = 0; i < oneOffs.length; ++i) {
+    let oneOffButton = oneOffs[i];
+    is(
+      textbox.selectedButton,
+      oneOffButton,
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+    await checkHeader(oneOffButton.engine);
+    EventUtils.synthesizeKey("KEY_ArrowDown");
+  }
+
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+  await checkHeader(Services.search.defaultEngine);
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+
+  // We should now be back to the initial situation.
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  await checkHeader(Services.search.defaultEngine);
+
+  info("now test the up arrow key");
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+  await checkHeader(Services.search.defaultEngine);
+
+  // cycle through the one-off items, the first one is already selected.
+  for (let i = oneOffs.length; i; --i) {
+    EventUtils.synthesizeKey("KEY_ArrowUp");
+    let oneOffButton = oneOffs[i - 1];
+    is(
+      textbox.selectedButton,
+      oneOffButton,
+      "the one-off button #" + i + " should be selected"
+    );
+    await checkHeader(oneOffButton.engine);
+  }
+
+  // Another press on up should clear the one-off selection and select the
+  // last suggestion.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  for (let i = kValues.length - 1; i >= 0; --i) {
+    is(
+      searchPopup.selectedIndex,
+      i,
+      "the suggestion at index " + i + " should be selected"
+    );
+    is(
+      textbox.value,
+      kValues[i],
+      "the textfield value should be " + kValues[i]
+    );
+    await checkHeader(Services.search.defaultEngine);
+    EventUtils.synthesizeKey("KEY_ArrowUp");
+  }
+
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(
+    textbox.value,
+    kUserValue,
+    "the textfield value should be back to initial value"
+  );
+});
+
+add_task(async function test_typing_clears_button_selection() {
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "the search bar should be focused"
+  ); // from the previous test.
+  ok(!textbox.selectedButton, "no button should be selected");
+
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  // Type a character.
+  EventUtils.sendString("a");
+  ok(!textbox.selectedButton, "the settings item should be de-selected");
+
+  // Remove the character.
+  EventUtils.synthesizeKey("KEY_Backspace");
+});
+
+add_task(async function test_tab() {
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "the search bar should be focused"
+  ); // from the previous test.
+
+  let oneOffs = getOneOffs();
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // Pressing tab should select the first one-off without selecting suggestions.
+  // now cycle through the one-off items, the first one is already selected.
+  for (let i = 0; i < oneOffs.length; ++i) {
+    EventUtils.synthesizeKey("KEY_Tab");
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+  }
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, kUserValue, "the textfield value should be unmodified");
+
+  // One more <tab> selects the settings button.
+  EventUtils.synthesizeKey("KEY_Tab");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  // Pressing tab again should close the panel...
+  let promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Tab");
+  await promise;
+
+  // ... and move the focus out of the searchbox.
+  ok(
+    !Services.focus.focusedElement.classList.contains("searchbar-textbox"),
+    "the search input in the search bar should no longer be focused"
+  );
+});
+
+add_task(async function test_shift_tab() {
+  // First reopen the panel.
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  searchbar.focus();
+  await promise;
+
+  let oneOffs = getOneOffs();
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // Press up once to select the last button.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  // Press up again to select the last one-off button.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+
+  // Pressing shift+tab should cycle through the one-off items.
+  for (let i = oneOffs.length - 1; i >= 0; --i) {
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+    if (i) {
+      EventUtils.synthesizeKey("KEY_Tab", { shiftKey: true });
+    }
+  }
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, kUserValue, "the textfield value should be unmodified");
+
+  // Pressing shift+tab again should close the panel...
+  promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Tab", { shiftKey: true });
+  await promise;
+
+  // ... and move the focus out of the searchbox.
+  ok(
+    !Services.focus.focusedElement.classList.contains("searchbar-textbox"),
+    "the search input in the search bar should no longer be focused"
+  );
+
+  // Return the focus to the search bar
+  EventUtils.synthesizeKey("KEY_Tab");
+  ok(
+    Services.focus.focusedElement.classList.contains("searchbar-textbox"),
+    "the search bar should be focused"
+  );
+
+  // ... and confirm the input value was autoselected and is replaced.
+  EventUtils.synthesizeKey("fo");
+  is(
+    Services.focus.focusedElement.value,
+    "fo",
+    "when the search bar was focused, the value should be autoselected"
+  );
+  // Return to the expected value
+  EventUtils.synthesizeKey("o");
+});
+
+add_task(async function test_alt_down() {
+  // First refocus the panel.
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  searchbar.focus();
+  await promise;
+
+  // close the panel using the escape key.
+  promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Escape");
+  await promise;
+
+  // check that alt+down opens the panel...
+  promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+  await promise;
+
+  // ... and does nothing else.
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, kUserValue, "the textfield value should be unmodified");
+
+  // Pressing alt+down should select the first one-off without selecting suggestions
+  // and cycle through the one-off items.
+  let oneOffs = getOneOffs();
+  for (let i = 0; i < oneOffs.length; ++i) {
+    EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+    is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  }
+
+  // One more alt+down keypress and nothing should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // another one and the first one-off should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+  is(
+    textbox.selectedButton,
+    oneOffs[0],
+    "the first one-off button should be selected"
+  );
+});
+
+add_task(async function test_alt_up() {
+  // close the panel using the escape key.
+  let promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Escape");
+  await promise;
+  ok(
+    !textbox.selectedButton,
+    "no one-off button should be selected after closing the panel"
+  );
+
+  // check that alt+up opens the panel...
+  promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeKey("KEY_ArrowUp", { altKey: true });
+  await promise;
+
+  // ... and does nothing else.
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, kUserValue, "the textfield value should be unmodified");
+
+  // Pressing alt+up should select the last one-off without selecting suggestions
+  // and cycle up through the one-off items.
+  let oneOffs = getOneOffs();
+  for (let i = oneOffs.length - 1; i >= 0; --i) {
+    EventUtils.synthesizeKey("KEY_ArrowUp", { altKey: true });
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+    is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  }
+
+  // One more alt+down keypress and nothing should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowUp", { altKey: true });
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // another one and the last one-off should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowUp", { altKey: true });
+  is(
+    textbox.selectedButton,
+    oneOffs[oneOffs.length - 1],
+    "the last one-off button should be selected"
+  );
+
+  // Cleanup for the next test.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  ok(!textbox.selectedButton, "no one-off should be selected anymore");
+});
+
+add_task(async function test_accel_down() {
+  // Pressing accel+down should select the next visible search engine, without
+  // selecting suggestions.
+  let engines = await Services.search.getVisibleEngines();
+  let current = Services.search.defaultEngine;
+  let currIdx = -1;
+  for (let i = 0, l = engines.length; i < l; ++i) {
+    if (engines[i].name == current.name) {
+      currIdx = i;
+      break;
+    }
+  }
+  for (let i = 0, l = engines.length; i < l; ++i) {
+    EventUtils.synthesizeKey("KEY_ArrowDown", { accelKey: true });
+    await SearchTestUtils.promiseSearchNotification(
+      "engine-default",
+      "browser-search-engine-modified"
+    );
+    let expected = engines[++currIdx % engines.length];
+    is(
+      Services.search.defaultEngine.name,
+      expected.name,
+      "Default engine should have changed"
+    );
+    is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  }
+  Services.search.defaultEngine = current;
+});
+
+add_task(async function test_accel_up() {
+  // Pressing accel+down should select the previous visible search engine, without
+  // selecting suggestions.
+  let engines = await Services.search.getVisibleEngines();
+  let current = Services.search.defaultEngine;
+  let currIdx = -1;
+  for (let i = 0, l = engines.length; i < l; ++i) {
+    if (engines[i].name == current.name) {
+      currIdx = i;
+      break;
+    }
+  }
+  for (let i = 0, l = engines.length; i < l; ++i) {
+    EventUtils.synthesizeKey("KEY_ArrowUp", { accelKey: true });
+    await SearchTestUtils.promiseSearchNotification(
+      "engine-default",
+      "browser-search-engine-modified"
+    );
+    let expected =
+      engines[--currIdx < 0 ? (currIdx = engines.length - 1) : currIdx];
+    is(
+      Services.search.defaultEngine.name,
+      expected.name,
+      "Default engine should have changed"
+    );
+    is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  }
+  Services.search.defaultEngine = current;
+});
+
+add_task(async function test_tab_and_arrows() {
+  // Check the initial state is as expected.
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, kUserValue, "the textfield value should be unmodified");
+
+  // After pressing down, the first sugggestion should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  is(searchPopup.selectedIndex, 0, "first suggestion should be selected");
+  is(textbox.value, kValues[0], "the textfield value should have changed");
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // After pressing tab, the first one-off should be selected,
+  // and no suggestion should be selected.
+  let oneOffs = getOneOffs();
+  EventUtils.synthesizeKey("KEY_Tab");
+  is(
+    textbox.selectedButton,
+    oneOffs[0],
+    "the first one-off button should be selected"
+  );
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // After pressing down, the second one-off should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  is(
+    textbox.selectedButton,
+    oneOffs[1],
+    "the second one-off button should be selected"
+  );
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // After pressing right, the third one-off should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowRight");
+  is(
+    textbox.selectedButton,
+    oneOffs[2],
+    "the third one-off button should be selected"
+  );
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // After pressing left, the second one-off should be selected again.
+  EventUtils.synthesizeKey("KEY_ArrowLeft");
+  is(
+    textbox.selectedButton,
+    oneOffs[1],
+    "the second one-off button should be selected again"
+  );
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // After pressing up, the first one-off should be selected again.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  is(
+    textbox.selectedButton,
+    oneOffs[0],
+    "the first one-off button should be selected again"
+  );
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // After pressing up again, the last suggestion should be selected.
+  // the textfield value back to the user-typed value, and still the first one-off
+  // selected.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  is(
+    searchPopup.selectedIndex,
+    kValues.length - 1,
+    "last suggestion should be selected"
+  );
+  is(
+    textbox.value,
+    kValues[kValues.length - 1],
+    "the textfield value should match the suggestion"
+  );
+  is(textbox.selectedButton, null, "no one-off button should be selected");
+
+  // Now pressing down should select the first one-off.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  is(
+    textbox.selectedButton,
+    oneOffs[0],
+    "the first one-off button should be selected"
+  );
+  is(searchPopup.selectedIndex, -1, "there should be no selected suggestion");
+
+  // Finally close the panel.
+  let promise = promiseEvent(searchPopup, "popuphidden");
+  searchPopup.hidePopup();
+  await promise;
+});
+
+add_task(async function test_open_search() {
+  let rootDir = getRootDirectory(gTestPath);
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    rootDir + "opensearch.html"
+  );
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  searchbar.focus();
+  await promise;
+
+  let engines = searchPopup.querySelectorAll(
+    ".searchbar-engine-one-off-add-engine"
+  );
+  is(engines.length, 3, "the opensearch.html page exposes 3 engines");
+
+  // Check that there's initially no selection.
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  ok(!textbox.selectedButton, "no button should be selected");
+
+  // Pressing up once selects the setting button...
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  // ...and then pressing up selects open search engines.
+  for (let i = engines.length; i; --i) {
+    EventUtils.synthesizeKey("KEY_ArrowUp");
+    let selectedButton = textbox.selectedButton;
+    is(
+      selectedButton,
+      engines[i - 1],
+      "the engine #" + i + " should be selected"
+    );
+    ok(
+      selectedButton.classList.contains("searchbar-engine-one-off-add-engine"),
+      "the button is themed as an add engine"
+    );
+  }
+
+  // Pressing up again should select the last one-off button.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  const allOneOffs = getOneOffs();
+  is(
+    textbox.selectedButton,
+    allOneOffs[allOneOffs.length - engines.length - 1],
+    "the last one-off button should be selected"
+  );
+
+  info("now check that the down key navigates open search items as expected");
+  for (let i = 0; i < engines.length; ++i) {
+    EventUtils.synthesizeKey("KEY_ArrowDown");
+    is(
+      textbox.selectedButton,
+      engines[i],
+      "the engine #" + (i + 1) + " should be selected"
+    );
+  }
+
+  // Pressing down on the last engine item selects the settings button.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  searchPopup.hidePopup();
+  await promise;
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function cleanup() {
+  info("removing search history values: " + kValues);
+  let removeOps = kValues.map(value => {
+    return { op: "remove", fieldname: "searchbar-history", value };
+  });
+  await FormHistory.update(removeOps);
+
+  textbox.value = "";
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_openpopup.js b/browser/components/search/test/browser/browser_searchbar_openpopup.js
new file mode 100644
index 0000000000..2653e65e8d
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_openpopup.js
@@ -0,0 +1,812 @@
+// Tests that the suggestion popup appears at the right times in response to
+// focus and user events (mouse, keyboard, drop).
+
+const searchPopup = document.getElementById("PopupSearchAutoComplete");
+const kValues = ["long text", "long text 2", "long text 3"];
+
+async function endCustomizing(aWindow = window) {
+  if (aWindow.document.documentElement.getAttribute("customizing") != "true") {
+    return true;
+  }
+  let eventPromise = BrowserTestUtils.waitForEvent(
+    aWindow.gNavToolbox,
+    "aftercustomization"
+  );
+  aWindow.gCustomizeMode.exit();
+  return eventPromise;
+}
+
+async function startCustomizing(aWindow = window) {
+  if (aWindow.document.documentElement.getAttribute("customizing") == "true") {
+    return true;
+  }
+  let eventPromise = BrowserTestUtils.waitForEvent(
+    aWindow.gNavToolbox,
+    "customizationready"
+  );
+  aWindow.gCustomizeMode.enter();
+  return eventPromise;
+}
+
+let searchbar;
+let textbox;
+let searchIcon;
+let goButton;
+let engine;
+
+add_setup(async function () {
+  searchbar = await gCUITestUtils.addSearchBar();
+  textbox = searchbar.textbox;
+  searchIcon = searchbar.querySelector(".searchbar-search-button");
+  goButton = searchbar.querySelector(".search-go-button");
+
+  engine = await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + "testEngine.xml",
+    setAsDefault: true,
+  });
+
+  await clearSearchbarHistory();
+
+  let addOps = kValues.map(value => {
+    return { op: "add", fieldname: "searchbar-history", value };
+  });
+  info("adding search history values: " + kValues);
+  await FormHistory.update(addOps);
+
+  registerCleanupFunction(async () => {
+    await clearSearchbarHistory();
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+// Adds a task that shouldn't show the search suggestions popup.
+function add_no_popup_task(task) {
+  add_task(async function () {
+    let sawPopup = false;
+    function listener() {
+      sawPopup = true;
+    }
+
+    info("Entering test " + task.name);
+    searchPopup.addEventListener("popupshowing", listener);
+    await task();
+    searchPopup.removeEventListener("popupshowing", listener);
+    ok(!sawPopup, "Shouldn't have seen the suggestions popup");
+    info("Leaving test " + task.name);
+  });
+}
+
+// Simulates the full set of events for a context click
+function context_click(target) {
+  for (let event of ["mousedown", "contextmenu"]) {
+    EventUtils.synthesizeMouseAtCenter(target, { type: event, button: 2 });
+  }
+}
+
+// Right clicking the icon should not open the popup.
+add_no_popup_task(async function open_icon_context() {
+  gURLBar.focus();
+  let toolbarPopup = document.getElementById("toolbar-context-menu");
+
+  let promise = promiseEvent(toolbarPopup, "popupshown");
+  context_click(searchIcon);
+  await promise;
+
+  promise = promiseEvent(toolbarPopup, "popuphidden");
+  toolbarPopup.hidePopup();
+  await promise;
+});
+
+// With no text in the search box left clicking the icon should open the popup.
+// Clicking the icon again should hide the popup and not show it again.
+add_task(async function open_empty() {
+  gURLBar.focus();
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Clicking icon");
+  is(
+    searchIcon.getAttribute("aria-expanded"),
+    "false",
+    "The search icon is not expanded by default"
+  );
+  EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  await promise;
+  is(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should only show the settings"
+  );
+  is(
+    searchIcon.getAttribute("aria-expanded"),
+    "true",
+    "The search icon is now expanded"
+  );
+  is(textbox.mController.searchString, "", "Should be an empty search string");
+
+  let image = searchPopup.querySelector(".searchbar-engine-image");
+  Assert.equal(
+    image.src,
+    engine.getIconURL(16),
+    "Should have the correct icon"
+  );
+
+  // By giving the textbox some text any next attempt to open the search popup
+  // from the click handler will try to search for this text.
+  textbox.value = "foo";
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+
+  info("Hiding popup");
+  await EventUtils.promiseNativeMouseEventAndWaitForEvent({
+    type: "click",
+    target: searchIcon,
+    atCenter: true,
+    eventTypeToWait: "mouseup",
+  });
+  await promise;
+
+  is(
+    textbox.mController.searchString,
+    "",
+    "Should not have started to search for the new text"
+  );
+  is(
+    searchIcon.getAttribute("aria-expanded"),
+    "false",
+    "The search icon should not be expanded"
+  );
+
+  // Cancel the search if it started.
+  if (textbox.mController.searchString != "") {
+    textbox.mController.stopSearch();
+  }
+
+  textbox.value = "";
+});
+
+// With no text in the search box left clicking it should not open the popup.
+add_no_popup_task(function click_doesnt_open_popup() {
+  gURLBar.focus();
+
+  EventUtils.synthesizeMouseAtCenter(textbox, {});
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 0, "Should have selected all of the text");
+});
+
+// Left clicking in a non-empty search box when unfocused should focus it and open the popup.
+add_task(async function click_opens_popup() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(textbox, {});
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  searchPopup.hidePopup();
+  await promise;
+
+  textbox.value = "";
+});
+
+add_task(async function open_empty_hiddenOneOffs() {
+  // Disable all the engines but the current one and check the oneoffs.
+  let defaultEngine = await Services.search.getDefault();
+  let engines = (await Services.search.getVisibleEngines()).filter(
+    e => e.name != defaultEngine.name
+  );
+
+  engines.forEach(e => {
+    e.hideOneOffButton = true;
+  });
+
+  textbox.value = "foo";
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(textbox, {});
+  await promise;
+
+  Assert.ok(
+    searchPopup.searchOneOffsContainer.hasAttribute("hidden"),
+    "The one-offs buttons container should have the hidden attribute."
+  );
+  Assert.ok(
+    BrowserTestUtils.isHidden(searchPopup.searchOneOffsContainer),
+    "The one-off buttons container should be hidden."
+  );
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+
+  info("Hiding popup");
+  await EventUtils.promiseNativeMouseEventAndWaitForEvent({
+    type: "click",
+    target: searchIcon,
+    atCenter: true,
+    eventTypeToWait: "mouseup",
+  });
+  await promise;
+
+  engines.forEach(e => {
+    e.hideOneOffButton = false;
+  });
+  textbox.value = "";
+});
+
+// Right clicking in a non-empty search box when unfocused should open the edit context menu.
+add_no_popup_task(async function right_click_doesnt_open_popup() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  // Can't wait for an event on the actual menu since it is created
+  // lazily the first time it is displayed.
+  let promise = new Promise(resolve => {
+    let listener = event => {
+      if (searchbar._menupopup && event.target == searchbar._menupopup) {
+        resolve(searchbar._menupopup);
+      }
+    };
+    window.addEventListener("popupshown", listener);
+  });
+  context_click(textbox);
+  let contextPopup = await promise;
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  promise = promiseEvent(contextPopup, "popuphidden");
+  contextPopup.hidePopup();
+  await promise;
+
+  textbox.value = "";
+});
+
+// Moving focus away from the search box should close the popup
+add_task(async function focus_change_closes_popup() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(textbox, {});
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  let promise2 = promiseEvent(searchbar.textbox, "blur");
+  EventUtils.synthesizeKey("KEY_Tab", { shiftKey: true });
+  await promise;
+  await promise2;
+
+  textbox.value = "";
+});
+
+// Moving focus away from the search box should close the small popup
+add_task(async function focus_change_closes_small_popup() {
+  gURLBar.focus();
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  // For some reason sending the mouse event immediately doesn't open the popup.
+  SimpleTest.executeSoon(() => {
+    EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  });
+  await promise;
+  is(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the small popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  let promise2 = promiseEvent(searchbar.textbox, "blur");
+  EventUtils.synthesizeKey("KEY_Tab", { shiftKey: true });
+  await promise;
+  await promise2;
+});
+
+// Pressing escape should close the popup.
+add_task(async function escape_closes_popup() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(textbox, {});
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Escape");
+  await promise;
+
+  textbox.value = "";
+});
+
+// Pressing contextmenu should close the popup.
+add_task(async function contextmenu_closes_popup() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(textbox, {});
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  let contextPopup = searchbar._menupopup;
+  let contextMenuShownPromise = promiseEvent(contextPopup, "popupshown");
+  let searchPopupHiddenPromise = promiseEvent(searchPopup, "popuphidden");
+  context_click(textbox);
+  await contextMenuShownPromise;
+  await searchPopupHiddenPromise;
+
+  let contextMenuHiddenPromise = promiseEvent(contextPopup, "popuphidden");
+  contextPopup.hidePopup();
+  await contextMenuHiddenPromise;
+
+  textbox.value = "";
+});
+
+// Tabbing to the search box should open the popup if it contains text.
+add_task(async function tab_opens_popup() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeKey("KEY_Tab");
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  searchPopup.hidePopup();
+  await promise;
+
+  textbox.value = "";
+});
+
+// Tabbing to the search box should not open the popup if it doesn't contain text.
+add_no_popup_task(function tab_doesnt_open_popup() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  EventUtils.synthesizeKey("KEY_Tab");
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  textbox.value = "";
+});
+
+// Switching back to the window when the search box has focus from mouse should not open the popup.
+add_task(async function refocus_window_doesnt_open_popup_mouse() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(searchbar, {});
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  let newWin = OpenBrowserWindow();
+  await new Promise(resolve => waitForFocus(resolve, newWin));
+  await promise;
+
+  function listener() {
+    ok(false, "Should not have shown the popup.");
+  }
+  searchPopup.addEventListener("popupshowing", listener);
+
+  promise = promiseEvent(searchbar.textbox, "focus");
+  newWin.close();
+  await promise;
+
+  // Wait a few ticks to allow any focus handlers to show the popup if they are going to.
+  await new Promise(resolve => executeSoon(resolve));
+  await new Promise(resolve => executeSoon(resolve));
+  await new Promise(resolve => executeSoon(resolve));
+
+  searchPopup.removeEventListener("popupshowing", listener);
+  textbox.value = "";
+});
+
+// Switching back to the window when the search box has focus from keyboard should not open the popup.
+add_task(async function refocus_window_doesnt_open_popup_keyboard() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeKey("KEY_Tab");
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  let newWin = OpenBrowserWindow();
+  await new Promise(resolve => waitForFocus(resolve, newWin));
+  await promise;
+
+  function listener() {
+    ok(false, "Should not have shown the popup.");
+  }
+  searchPopup.addEventListener("popupshowing", listener);
+
+  promise = promiseEvent(searchbar.textbox, "focus");
+  newWin.close();
+  await promise;
+
+  // Wait a few ticks to allow any focus handlers to show the popup if they are going to.
+  await new Promise(resolve => executeSoon(resolve));
+  await new Promise(resolve => executeSoon(resolve));
+  await new Promise(resolve => executeSoon(resolve));
+
+  searchPopup.removeEventListener("popupshowing", listener);
+  textbox.value = "";
+});
+
+// Clicking the search go button shouldn't open the popup
+add_no_popup_task(async function search_go_doesnt_open_popup() {
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
+
+  gURLBar.focus();
+  textbox.value = "foo";
+  searchbar.updateGoButtonVisibility();
+
+  let promise = BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+  EventUtils.synthesizeMouseAtCenter(goButton, {});
+  await promise;
+
+  textbox.value = "";
+  gBrowser.removeCurrentTab();
+});
+
+// Clicks outside the search popup should close the popup but not consume the click.
+add_task(async function dont_consume_clicks() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(textbox, {});
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  is(textbox.selectionStart, 0, "Should have selected all of the text");
+  is(textbox.selectionEnd, 3, "Should have selected all of the text");
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  await EventUtils.promiseNativeMouseEventAndWaitForEvent({
+    type: "click",
+    target: gURLBar.inputField,
+    atCenter: true,
+    eventTypeToWait: "mouseup",
+  });
+  await promise;
+
+  is(
+    Services.focus.focusedElement,
+    gURLBar.inputField,
+    "Should have focused the URL bar"
+  );
+
+  textbox.value = "";
+});
+
+// Dropping text to the searchbar should open the popup
+add_task(async function drop_opens_popup() {
+  CustomizableUI.addWidgetToArea("home-button", "nav-bar");
+  // The previous task leaves focus in the URL bar. However, in that case drags
+  // can be interpreted as being selection drags by the drag manager, which
+  // breaks the drag synthesis from EventUtils.js below. To avoid this, focus
+  // the browser content instead.
+  let focusEventPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.selectedBrowser,
+    "focus"
+  );
+  gBrowser.selectedBrowser.focus();
+  await focusEventPromise;
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  // Use a source for the drop that is outside of the search bar area, to avoid
+  // it receiving a mousedown and causing the popup to sometimes open.
+  let homeButton = document.getElementById("home-button");
+  EventUtils.synthesizeDrop(
+    homeButton,
+    textbox,
+    [[{ type: "text/plain", data: "foo" }]],
+    "move",
+    window
+  );
+  await promise;
+
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "Should have focused the search bar"
+  );
+  promise = promiseEvent(searchPopup, "popuphidden");
+  searchPopup.hidePopup();
+  await promise;
+
+  textbox.value = "";
+  CustomizableUI.removeWidgetFromArea("home-button");
+});
+
+// Moving the caret using the cursor keys should not close the popup.
+add_task(async function dont_rollup_oncaretmove() {
+  gURLBar.focus();
+  textbox.value = "long text";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(textbox, {});
+  await promise;
+
+  // Deselect the text
+  EventUtils.synthesizeKey("KEY_ArrowRight");
+  is(
+    textbox.selectionStart,
+    9,
+    "Should have moved the caret (selectionStart after deselect right)"
+  );
+  is(
+    textbox.selectionEnd,
+    9,
+    "Should have moved the caret (selectionEnd after deselect right)"
+  );
+  is(searchPopup.state, "open", "Popup should still be open");
+
+  EventUtils.synthesizeKey("KEY_ArrowLeft");
+  is(
+    textbox.selectionStart,
+    8,
+    "Should have moved the caret (selectionStart after left)"
+  );
+  is(
+    textbox.selectionEnd,
+    8,
+    "Should have moved the caret (selectionEnd after left)"
+  );
+  is(searchPopup.state, "open", "Popup should still be open");
+
+  EventUtils.synthesizeKey("KEY_ArrowRight");
+  is(
+    textbox.selectionStart,
+    9,
+    "Should have moved the caret (selectionStart after right)"
+  );
+  is(
+    textbox.selectionEnd,
+    9,
+    "Should have moved the caret (selectionEnd after right)"
+  );
+  is(searchPopup.state, "open", "Popup should still be open");
+
+  // Ensure caret movement works while a suggestion is selected.
+  is(textbox.popup.selectedIndex, -1, "No selected item in list");
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  is(textbox.popup.selectedIndex, 0, "Selected item in list");
+  is(
+    textbox.selectionStart,
+    9,
+    "Should have moved the caret to the end (selectionStart after selection)"
+  );
+  is(
+    textbox.selectionEnd,
+    9,
+    "Should have moved the caret to the end (selectionEnd after selection)"
+  );
+
+  EventUtils.synthesizeKey("KEY_ArrowLeft");
+  is(
+    textbox.selectionStart,
+    8,
+    "Should have moved the caret again (selectionStart after left)"
+  );
+  is(
+    textbox.selectionEnd,
+    8,
+    "Should have moved the caret again (selectionEnd after left)"
+  );
+  is(searchPopup.state, "open", "Popup should still be open");
+
+  EventUtils.synthesizeKey("KEY_ArrowLeft");
+  is(
+    textbox.selectionStart,
+    7,
+    "Should have moved the caret (selectionStart after left)"
+  );
+  is(
+    textbox.selectionEnd,
+    7,
+    "Should have moved the caret (selectionEnd after left)"
+  );
+  is(searchPopup.state, "open", "Popup should still be open");
+
+  EventUtils.synthesizeKey("KEY_ArrowRight");
+  is(
+    textbox.selectionStart,
+    8,
+    "Should have moved the caret (selectionStart after right)"
+  );
+  is(
+    textbox.selectionEnd,
+    8,
+    "Should have moved the caret (selectionEnd after right)"
+  );
+  is(searchPopup.state, "open", "Popup should still be open");
+
+  if (!navigator.platform.includes("Mac")) {
+    EventUtils.synthesizeKey("KEY_Home");
+    is(
+      textbox.selectionStart,
+      0,
+      "Should have moved the caret (selectionStart after home)"
+    );
+    is(
+      textbox.selectionEnd,
+      0,
+      "Should have moved the caret (selectionEnd after home)"
+    );
+    is(searchPopup.state, "open", "Popup should still be open");
+  }
+
+  // Close the popup again
+  promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Escape");
+  await promise;
+
+  textbox.value = "";
+});
+
+// Entering customization mode shouldn't open the popup.
+add_task(async function dont_open_in_customization() {
+  gURLBar.focus();
+  textbox.value = "foo";
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  EventUtils.synthesizeKey("KEY_Tab");
+  await promise;
+  isnot(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the full popup"
+  );
+
+  info("Entering customization mode");
+  let sawPopup = false;
+  function listener() {
+    sawPopup = true;
+  }
+  searchPopup.addEventListener("popupshowing", listener);
+  await gCUITestUtils.openMainMenu();
+  promise = promiseEvent(searchPopup, "popuphidden");
+  await startCustomizing();
+  await promise;
+
+  searchPopup.removeEventListener("popupshowing", listener);
+  ok(!sawPopup, "Shouldn't have seen the suggestions popup");
+
+  await endCustomizing();
+  textbox.value = "";
+});
+
+add_task(async function cleanup() {
+  info("removing search history values: " + kValues);
+  let removeOps = kValues.map(value => {
+    return { op: "remove", fieldname: "searchbar-history", value };
+  });
+  FormHistory.update(removeOps);
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_results.js b/browser/components/search/test/browser/browser_searchbar_results.js
new file mode 100644
index 0000000000..95bb5674c7
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_results.js
@@ -0,0 +1,60 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+  await clearSearchbarHistory();
+
+  await SearchTestUtils.installSearchExtension(
+    {
+      id: "test",
+      name: "test",
+      suggest_url:
+        "https://example.com/browser/browser/components/search/test/browser/searchSuggestionEngine.sjs",
+      suggest_url_get_params: "query={searchTerms}",
+    },
+    { setAsDefault: true }
+  );
+
+  registerCleanupFunction(async () => {
+    await clearSearchbarHistory();
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+async function check_results(input, expected) {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "about:blank",
+    },
+    async browser => {
+      let popup = await searchInSearchbar(input);
+
+      const listItemElems = popup.richlistbox.querySelectorAll(
+        ".autocomplete-richlistitem"
+      );
+
+      Assert.deepEqual(
+        Array.from(listItemElems)
+          .filter(e => !e.collapsed)
+          .map(e => e.getAttribute("title")),
+        expected,
+        "Should have received the expected suggestions"
+      );
+
+      // Now visit the search to put an item in form history.
+      let p = BrowserTestUtils.browserLoaded(browser);
+      EventUtils.synthesizeKey("KEY_Enter");
+      await p;
+    }
+  );
+}
+
+add_task(async function test_utf8_results() {
+  await check_results("。", ["。foo", "。bar"]);
+
+  // The first run added the entry into form history, check that is correct
+  // as well.
+  await check_results("。", ["。", "。foo", "。bar"]);
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_smallpanel_keyboard_navigation.js b/browser/components/search/test/browser/browser_searchbar_smallpanel_keyboard_navigation.js
new file mode 100644
index 0000000000..a4509cbd90
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_smallpanel_keyboard_navigation.js
@@ -0,0 +1,453 @@
+// Tests that keyboard navigation in the search panel works as designed.
+
+const searchPopup = document.getElementById("PopupSearchAutoComplete");
+
+const kValues = ["foo1", "foo2", "foo3"];
+
+function getOpenSearchItems() {
+  let os = [];
+
+  let addEngineList = searchPopup.querySelector(".search-add-engines");
+  for (
+    let item = addEngineList.firstElementChild;
+    item;
+    item = item.nextElementSibling
+  ) {
+    os.push(item);
+  }
+
+  return os;
+}
+
+let searchbar;
+let textbox;
+let searchIcon;
+
+add_setup(async function () {
+  searchbar = await gCUITestUtils.addSearchBar();
+  registerCleanupFunction(() => {
+    gCUITestUtils.removeSearchBar();
+  });
+  textbox = searchbar.textbox;
+  searchIcon = searchbar.querySelector(".searchbar-search-button");
+
+  await SearchTestUtils.promiseNewSearchEngine({
+    url: getRootDirectory(gTestPath) + "testEngine.xml",
+    setAsDefault: true,
+  });
+
+  // First cleanup the form history in case other tests left things there.
+  info("cleanup the search history");
+  await FormHistory.update({ op: "remove", fieldname: "searchbar-history" });
+
+  info("adding search history values: " + kValues);
+  let addOps = kValues.map(value => {
+    return { op: "add", fieldname: "searchbar-history", value };
+  });
+  await FormHistory.update(addOps);
+
+  registerCleanupFunction(async () => {
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function test_arrows() {
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  await promise;
+  info(
+    "textbox.mController.searchString = " + textbox.mController.searchString
+  );
+  is(textbox.mController.searchString, "", "The search string should be empty");
+
+  // Check the initial state of the panel before sending keyboard events.
+  is(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the small popup"
+  );
+  // Having suggestions populated (but hidden) is important, because if there
+  // are none we can't ensure the keyboard events don't reach them.
+  is(searchPopup.matchCount, kValues.length, "There should be 3 suggestions");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // The tests will be less meaningful if the first, second, last, and
+  // before-last one-off buttons aren't different. We should always have more
+  // than 4 default engines, but it's safer to check this assumption.
+  let oneOffs = getOneOffs();
+  Assert.greaterOrEqual(
+    oneOffs.length,
+    4,
+    "we have at least 4 one-off buttons displayed"
+  );
+
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // Pressing should select the first one-off.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, "", "the textfield value should be unmodified");
+
+  // now cycle through the one-off items, the first one is already selected.
+  for (let i = 0; i < oneOffs.length; ++i) {
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+    EventUtils.synthesizeKey("KEY_ArrowDown");
+  }
+
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+
+  // We should now be back to the initial situation.
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  info("now test the up arrow key");
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  // cycle through the one-off items, the first one is already selected.
+  for (let i = oneOffs.length; i; --i) {
+    EventUtils.synthesizeKey("KEY_ArrowUp");
+    is(
+      textbox.selectedButton,
+      oneOffs[i - 1],
+      "the one-off button #" + i + " should be selected"
+    );
+  }
+
+  // Another press on up should clear the one-off selection.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, "", "the textfield value should be unmodified");
+});
+
+add_task(async function test_tab() {
+  is(
+    Services.focus.focusedElement,
+    textbox,
+    "the search bar should be focused"
+  ); // from the previous test.
+
+  let oneOffs = getOneOffs();
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // Pressing tab should select the first one-off without selecting suggestions.
+  // now cycle through the one-off items, the first one is already selected.
+  for (let i = 0; i < oneOffs.length; ++i) {
+    EventUtils.synthesizeKey("KEY_Tab");
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+  }
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, "", "the textfield value should be unmodified");
+
+  // One more <tab> selects the settings button.
+  EventUtils.synthesizeKey("KEY_Tab");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  // Pressing tab again should close the panel...
+  let promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Tab");
+  await promise;
+
+  // ... and move the focus out of the searchbox.
+  isnot(
+    Services.focus.focusedElement,
+    textbox,
+    "the search bar no longer be focused"
+  );
+});
+
+add_task(async function test_shift_tab() {
+  // First reopen the panel.
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  SimpleTest.executeSoon(() => {
+    EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  });
+  await promise;
+
+  let oneOffs = getOneOffs();
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  is(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the small popup"
+  );
+
+  // Press up once to select the last button.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  // Press up again to select the last one-off button.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+
+  // Pressing shift+tab should cycle through the one-off items.
+  for (let i = oneOffs.length - 1; i >= 0; --i) {
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+    if (i) {
+      EventUtils.synthesizeKey("KEY_Tab", { shiftKey: true });
+    }
+  }
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, "", "the textfield value should be unmodified");
+
+  // Pressing shift+tab again should close the panel...
+  promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Tab", { shiftKey: true });
+  await promise;
+
+  // ... and move the focus out of the searchbox.
+  isnot(
+    Services.focus.focusedElement,
+    textbox,
+    "the search bar no longer be focused"
+  );
+});
+
+add_task(async function test_alt_down() {
+  // First reopen the panel.
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  SimpleTest.executeSoon(() => {
+    EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  });
+  await promise;
+
+  // and check it's in a correct initial state.
+  is(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the small popup"
+  );
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, "", "the textfield value should be unmodified");
+
+  // Pressing alt+down should select the first one-off without selecting suggestions
+  // and cycle through the one-off items.
+  let oneOffs = getOneOffs();
+  for (let i = 0; i < oneOffs.length; ++i) {
+    EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+    is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  }
+
+  // One more alt+down keypress and nothing should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // another one and the first one-off should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+  is(
+    textbox.selectedButton,
+    oneOffs[0],
+    "the first one-off button should be selected"
+  );
+
+  // Clear the selection with an alt+up keypress
+  EventUtils.synthesizeKey("KEY_ArrowUp", { altKey: true });
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+});
+
+add_task(async function test_alt_up() {
+  // Check the initial state of the panel
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, "", "the textfield value should be unmodified");
+
+  // Pressing alt+up should select the last one-off without selecting suggestions
+  // and cycle up through the one-off items.
+  let oneOffs = getOneOffs();
+  for (let i = oneOffs.length - 1; i >= 0; --i) {
+    EventUtils.synthesizeKey("KEY_ArrowUp", { altKey: true });
+    is(
+      textbox.selectedButton,
+      oneOffs[i],
+      "the one-off button #" + (i + 1) + " should be selected"
+    );
+    is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  }
+
+  // One more alt+down keypress and nothing should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowUp", { altKey: true });
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+
+  // another one and the last one-off should be selected.
+  EventUtils.synthesizeKey("KEY_ArrowUp", { altKey: true });
+  is(
+    textbox.selectedButton,
+    oneOffs[oneOffs.length - 1],
+    "the last one-off button should be selected"
+  );
+
+  // Cleanup for the next test.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  ok(!textbox.selectedButton, "no one-off should be selected anymore");
+});
+
+add_task(async function test_tab_and_arrows() {
+  // Check the initial state is as expected.
+  ok(!textbox.selectedButton, "no one-off button should be selected");
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  is(textbox.value, "", "the textfield value should be unmodified");
+
+  // After pressing down, the first one-off should be selected.
+  let oneOffs = getOneOffs();
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  is(
+    textbox.selectedButton,
+    oneOffs[0],
+    "the first one-off button should be selected"
+  );
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // After pressing tab, the second one-off should be selected.
+  EventUtils.synthesizeKey("KEY_Tab");
+  is(
+    textbox.selectedButton,
+    oneOffs[1],
+    "the second one-off button should be selected"
+  );
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // After pressing up, the first one-off should be selected again.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  is(
+    textbox.selectedButton,
+    oneOffs[0],
+    "the first one-off button should be selected"
+  );
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+
+  // Finally close the panel.
+  let promise = promiseEvent(searchPopup, "popuphidden");
+  searchPopup.hidePopup();
+  await promise;
+});
+
+add_task(async function test_open_search() {
+  let rootDir = getRootDirectory(gTestPath);
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    rootDir + "opensearch.html"
+  );
+
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  EventUtils.synthesizeMouseAtCenter(searchIcon, {});
+  await promise;
+  is(
+    searchPopup.getAttribute("showonlysettings"),
+    "true",
+    "Should show the small popup"
+  );
+
+  let engines;
+  await TestUtils.waitForCondition(() => {
+    engines = searchPopup.querySelectorAll(
+      ".searchbar-engine-one-off-add-engine"
+    );
+    return engines.length == 3;
+  }, "Should expose three engines");
+
+  // Check that there's initially no selection.
+  is(searchPopup.selectedIndex, -1, "no suggestion should be selected");
+  ok(!textbox.selectedButton, "no button should be selected");
+
+  // Pressing up once selects the setting button...
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  // ...and then pressing up selects open search engines.
+  for (let i = engines.length; i; --i) {
+    EventUtils.synthesizeKey("KEY_ArrowUp");
+    let selectedButton = textbox.selectedButton;
+    is(
+      selectedButton,
+      engines[i - 1],
+      "the engine #" + i + " should be selected"
+    );
+    ok(
+      selectedButton.classList.contains("searchbar-engine-one-off-add-engine"),
+      "the button is themed as an add engine"
+    );
+  }
+
+  // Pressing up again should select the last one-off button.
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  const allOneOffs = getOneOffs();
+  is(
+    textbox.selectedButton,
+    allOneOffs[allOneOffs.length - engines.length - 1],
+    "the last one-off button should be selected"
+  );
+
+  info("now check that the down key navigates open search items as expected");
+  for (let i = 0; i < engines.length; ++i) {
+    EventUtils.synthesizeKey("KEY_ArrowDown");
+    is(
+      textbox.selectedButton,
+      engines[i],
+      "the engine #" + (i + 1) + " should be selected"
+    );
+  }
+
+  // Pressing down on the last engine item selects the settings button.
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  ok(
+    textbox.selectedButton.classList.contains("search-setting-button"),
+    "the settings item should be selected"
+  );
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  searchPopup.hidePopup();
+  await promise;
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function cleanup() {
+  info("removing search history values: " + kValues);
+  let removeOps = kValues.map(value => {
+    return { op: "remove", fieldname: "searchbar-history", value };
+  });
+  FormHistory.update(removeOps);
+});
diff --git a/browser/components/search/test/browser/browser_searchbar_widths.js b/browser/components/search/test/browser/browser_searchbar_widths.js
new file mode 100644
index 0000000000..3e17ebf833
--- /dev/null
+++ b/browser/components/search/test/browser/browser_searchbar_widths.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Check that when the searchbar has a specific width, opening a new window
+// honours that specific width.
+add_task(async function test_searchbar_width_persistence() {
+  await gCUITestUtils.addSearchBar();
+  registerCleanupFunction(async function () {
+    gCUITestUtils.removeSearchBar();
+  });
+
+  // Really, we should use the splitter, but drag/drop is hard and fragile in
+  // tests, so let's just fake it real quick:
+  let container = BrowserSearch.searchBar.parentNode;
+  // There's no width attribute set initially, just grab the info from layout:
+  let oldWidth = container.getBoundingClientRect().width;
+  let newWidth = "" + Math.round(oldWidth * 2);
+  container.setAttribute("width", newWidth);
+
+  let win = await BrowserTestUtils.openNewBrowserWindow();
+  let otherBar = win.BrowserSearch.searchBar;
+  ok(otherBar, "Should have a search bar in the other window");
+  if (otherBar) {
+    is(
+      otherBar.parentNode.getAttribute("width"),
+      newWidth,
+      "Should have matching width"
+    );
+  }
+  await BrowserTestUtils.closeWindow(win);
+});
diff --git a/browser/components/search/test/browser/browser_tooManyEnginesOffered.js b/browser/components/search/test/browser/browser_tooManyEnginesOffered.js
new file mode 100644
index 0000000000..e084850803
--- /dev/null
+++ b/browser/components/search/test/browser/browser_tooManyEnginesOffered.js
@@ -0,0 +1,68 @@
+"use strict";
+
+// This test makes sure that when a page offers many search engines,
+// a limited number of add-engine items will be shown in the searchbar.
+
+const searchPopup = document.getElementById("PopupSearchAutoComplete");
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+
+  await Services.search.init();
+  registerCleanupFunction(() => {
+    gCUITestUtils.removeSearchBar();
+  });
+});
+
+add_task(async function test() {
+  let searchbar = BrowserSearch.searchBar;
+
+  let rootDir = getRootDirectory(gTestPath);
+  let url = rootDir + "tooManyEnginesOffered.html";
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  // Open the search popup.
+  let promise = promiseEvent(searchPopup, "popupshown");
+  info("Opening search panel");
+  searchbar.focus();
+  // In TV we may try opening too early, when the searchbar is not ready yet.
+  await TestUtils.waitForCondition(
+    () => BrowserSearch.searchBar.textbox.controller.input,
+    "Wait for the searchbar controller to connect"
+  );
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  await promise;
+
+  const addEngineList = searchPopup.oneOffButtons._getAddEngines();
+  Assert.equal(
+    addEngineList.length,
+    6,
+    "Expected number of engines retrieved from web page"
+  );
+
+  const displayedAddEngineList =
+    searchPopup.oneOffButtons.buttons.querySelectorAll(
+      ".searchbar-engine-one-off-add-engine"
+    );
+  Assert.equal(
+    displayedAddEngineList.length,
+    searchPopup.oneOffButtons._maxInlineAddEngines,
+    "Expected number of engines displayed on popup"
+  );
+
+  for (let i = 0; i < displayedAddEngineList.length; i++) {
+    const engine = addEngineList[i];
+    const item = displayedAddEngineList[i];
+    Assert.equal(
+      item.getAttribute("engine-name"),
+      engine.title,
+      "Expected engine is displaying"
+    );
+  }
+
+  promise = promiseEvent(searchPopup, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Escape", {}, searchPopup.ownerGlobal);
+  await promise;
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/search/test/browser/browser_trending_suggestions.js b/browser/components/search/test/browser/browser_trending_suggestions.js
new file mode 100644
index 0000000000..74d0b944d5
--- /dev/null
+++ b/browser/components/search/test/browser/browser_trending_suggestions.js
@@ -0,0 +1,240 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const CONFIG_DEFAULT = [
+  {
+    webExtension: { id: "basic@search.mozilla.org" },
+    urls: {
+      trending: {
+        fullPath:
+          "https://example.com/browser/browser/components/search/test/browser/trendingSuggestionEngine.sjs",
+        query: "",
+      },
+    },
+    appliesTo: [{ included: { everywhere: true } }],
+    default: "yes",
+  },
+  {
+    webExtension: { id: "private@search.mozilla.org" },
+    appliesTo: [{ included: { everywhere: true } }],
+    default: "yes",
+  },
+];
+
+SearchTestUtils.init(this);
+
+add_setup(async () => {
+  // Use engines in test directory
+  let searchExtensions = getChromeDir(getResolvedURI(gTestPath));
+  searchExtensions.append("search-engines");
+  await SearchTestUtils.useMochitestEngines(searchExtensions);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.searches", true],
+      ["browser.urlbar.suggest.trending", true],
+    ],
+  });
+
+  SearchTestUtils.useMockIdleService();
+  await SearchTestUtils.updateRemoteSettingsConfig(CONFIG_DEFAULT);
+  Services.telemetry.clearScalars();
+
+  registerCleanupFunction(async () => {
+    let settingsWritten = SearchTestUtils.promiseSearchNotification(
+      "write-settings-to-disk-complete"
+    );
+    await SearchTestUtils.updateRemoteSettingsConfig();
+    await settingsWritten;
+  });
+});
+
+add_task(async function test_trending_results() {
+  await check_results({
+    featureEnabled: true,
+    searchMode: "@basic ",
+    expectedResults: 2,
+  });
+  await check_results({
+    featureEnabled: true,
+    requireSearchModeEnabled: false,
+    expectedResults: 2,
+  });
+  await check_results({
+    featureEnabled: true,
+    requireSearchModeEnabled: false,
+    searchMode: "@basic ",
+    expectedResults: 2,
+  });
+  await check_results({
+    featureEnabled: false,
+    searchMode: "@basic ",
+    expectedResults: 0,
+  });
+  await check_results({
+    featureEnabled: false,
+    expectedResults: 0,
+  });
+  await check_results({
+    featureEnabled: false,
+    requireSearchModeEnabled: false,
+    expectedResults: 0,
+  });
+  await check_results({
+    featureEnabled: false,
+    requireSearchModeEnabled: false,
+    searchMode: "@basic ",
+    expectedResults: 0,
+  });
+
+  // The private engine is not configured with any trending url.
+  await check_results({
+    featureEnabled: true,
+    searchMode: "@private ",
+    expectedResults: 0,
+  });
+
+  // Check we can configure the maximum number of results.
+  await check_results({
+    featureEnabled: true,
+    searchMode: "@basic ",
+    maxResultsSearchMode: 5,
+    expectedResults: 5,
+  });
+  await check_results({
+    featureEnabled: true,
+    requireSearchModeEnabled: false,
+    maxResultsNoSearchMode: 5,
+    expectedResults: 5,
+  });
+});
+
+add_task(async function test_trending_telemetry() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.trending.featureGate", true],
+      ["browser.urlbar.trending.requireSearchMode", false],
+    ],
+  });
+
+  await UrlbarTestUtils.promiseAutocompleteResultPopup({
+    window,
+    value: "",
+    waitForFocus: SimpleTest.waitForFocus,
+  });
+
+  await UrlbarTestUtils.promisePopupClose(window, () => {
+    EventUtils.synthesizeKey("KEY_ArrowDown");
+    EventUtils.synthesizeKey("KEY_Enter");
+  });
+
+  let scalars = TelemetryTestUtils.getProcessScalars("parent", true, true);
+  TelemetryTestUtils.assertKeyedScalar(scalars, "urlbar.picked.trending", 0, 1);
+});
+
+add_task(async function test_block_trending() {
+  Services.telemetry.clearScalars();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.trending.featureGate", true],
+      ["browser.urlbar.trending.requireSearchMode", false],
+    ],
+  });
+
+  await UrlbarTestUtils.promiseAutocompleteResultPopup({
+    window,
+    value: "",
+    waitForFocus: SimpleTest.waitForFocus,
+  });
+
+  Assert.equal(UrlbarTestUtils.getResultCount(window), 2);
+  let { result: trendingResult } = await UrlbarTestUtils.getDetailsOfResultAt(
+    window,
+    0
+  );
+  Assert.equal(trendingResult.payload.trending, true);
+
+  await UrlbarTestUtils.openResultMenuAndPressAccesskey(window, "D", {
+    resultIndex: 0,
+  });
+
+  await BrowserTestUtils.waitForCondition(
+    () => UrlbarTestUtils.getResultCount(window) == 1
+  );
+  let { result: heuristicResult } = await UrlbarTestUtils.getDetailsOfResultAt(
+    window,
+    0
+  );
+  Assert.notEqual(heuristicResult.payload.trending, true);
+
+  TelemetryTestUtils.assertScalar(
+    TelemetryTestUtils.getProcessScalars("parent", false, true),
+    "urlbar.trending.block",
+    1
+  );
+
+  await UrlbarTestUtils.promisePopupClose(window, () => {
+    EventUtils.synthesizeKey("KEY_Escape");
+  });
+  await SpecialPowers.popPrefEnv();
+});
+
+async function check_results({
+  featureEnabled = false,
+  requireSearchModeEnabled = true,
+  searchMode = "",
+  expectedResults = 0,
+  maxResultsSearchMode = 2,
+  maxResultsNoSearchMode = 2,
+}) {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.trending.maxResultsSearchMode", maxResultsSearchMode],
+      [
+        "browser.urlbar.trending.maxResultsNoSearchMode",
+        maxResultsNoSearchMode,
+      ],
+      ["browser.urlbar.trending.featureGate", featureEnabled],
+      ["browser.urlbar.trending.requireSearchMode", requireSearchModeEnabled],
+    ],
+  });
+
+  // If we are not in a search mode and there are no results. The urlbar
+  // will not open.
+  if (!searchMode && !expectedResults) {
+    window.gURLBar.inputField.focus();
+    Assert.ok(!UrlbarTestUtils.isPopupOpen(window));
+    return;
+  }
+
+  await UrlbarTestUtils.promiseAutocompleteResultPopup({
+    window,
+    value: searchMode,
+    waitForFocus: SimpleTest.waitForFocus,
+  });
+
+  Assert.equal(
+    UrlbarTestUtils.getResultCount(window),
+    expectedResults,
+    "We matched the expected number of results"
+  );
+
+  if (expectedResults) {
+    for (let i = 0; i < expectedResults; i++) {
+      let { result } = await UrlbarTestUtils.getDetailsOfResultAt(window, i);
+      Assert.equal(result.type, UrlbarUtils.RESULT_TYPE.SEARCH);
+      Assert.equal(result.providerName, "SearchSuggestions");
+      Assert.equal(result.payload.engine, "basic");
+      Assert.equal(result.payload.trending, true);
+    }
+  }
+
+  if (searchMode) {
+    await UrlbarTestUtils.exitSearchMode(window);
+  }
+  await UrlbarTestUtils.promisePopupClose(window, () => {
+    EventUtils.synthesizeKey("KEY_Escape");
+  });
+  await SpecialPowers.popPrefEnv();
+}
diff --git a/browser/components/search/test/browser/contentSearchBadImage.xml b/browser/components/search/test/browser/contentSearchBadImage.xml
new file mode 100644
index 0000000000..6e4cb60a58
--- /dev/null
+++ b/browser/components/search/test/browser/contentSearchBadImage.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
+<ShortName>browser_ContentSearch contentSearchBadImage.xml</ShortName>
+<Url type="text/html" method="GET" template="http://browser-ContentSearch.com/contentSearchBadImage" rel="searchform"/>
+<Image width="16" height="16">data:image/x-icon;base64,notbase64</Image>
+</SearchPlugin>
diff --git a/browser/components/search/test/browser/contentSearchSuggestions.sjs b/browser/components/search/test/browser/contentSearchSuggestions.sjs
new file mode 100644
index 0000000000..1978b4f665
--- /dev/null
+++ b/browser/components/search/test/browser/contentSearchSuggestions.sjs
@@ -0,0 +1,9 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function handleRequest(req, resp) {
+  let suffixes = ["foo", "bar"];
+  let data = [req.queryString, suffixes.map(s => req.queryString + s)];
+  resp.setHeader("Content-Type", "application/json", false);
+  resp.write(JSON.stringify(data));
+}
diff --git a/browser/components/search/test/browser/contentSearchSuggestions.xml b/browser/components/search/test/browser/contentSearchSuggestions.xml
new file mode 100644
index 0000000000..ca368c34f8
--- /dev/null
+++ b/browser/components/search/test/browser/contentSearchSuggestions.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
+<ShortName>browser_ContentSearch contentSearchSuggestions.xml</ShortName>
+<Url type="application/x-suggestions+json" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/contentSearchSuggestions.sjs?{searchTerms}"/>
+<Url type="text/html" method="GET" template="http://browser-ContentSearch.com/contentSearchSuggestions" rel="searchform"/>
+</SearchPlugin>
diff --git a/browser/components/search/test/browser/contentSearchUI.html b/browser/components/search/test/browser/contentSearchUI.html
new file mode 100644
index 0000000000..09abe822b2
--- /dev/null
+++ b/browser/components/search/test/browser/contentSearchUI.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+<head>
+<meta charset="utf-8">
+<script type="application/javascript"
+        src="chrome://browser/content/contentSearchUI.js">
+</script>
+<link rel="stylesheet" href="chrome://browser/content/contentSearchUI.css"/>
+<meta http-equiv="Content-Security-Policy" content="default-src data: chrome:; object-src 'none'"/>
+</head>
+<body>
+
+<div id="container"><input type="text" value=""/></div>
+
+<script src="chrome://mochitests/content/browser/browser/components/search/test/browser/contentSearchUI.js">
+</script>
+
+</body>
+</html>
diff --git a/browser/components/search/test/browser/contentSearchUI.js b/browser/components/search/test/browser/contentSearchUI.js
new file mode 100644
index 0000000000..7ccf0b6a6d
--- /dev/null
+++ b/browser/components/search/test/browser/contentSearchUI.js
@@ -0,0 +1,13 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* import-globals-from ../../content/contentSearchUI.js */
+var input = document.querySelector("input");
+var gController = new ContentSearchUIController(
+  input,
+  input.parentNode,
+  "test",
+  "test"
+);
diff --git a/browser/components/search/test/browser/discovery.html b/browser/components/search/test/browser/discovery.html
new file mode 100644
index 0000000000..0c73d592fe
--- /dev/null
+++ b/browser/components/search/test/browser/discovery.html
@@ -0,0 +1,9 @@
+<!DOCTYPE HTML>
+<html>
+  <head id="linkparent">
+    <meta charset="utf-8">
+    <title>Autodiscovery Test</title>
+  </head>
+  <body>
+  </body>
+</html>
diff --git a/browser/components/search/test/browser/google_codes/browser.toml b/browser/components/search/test/browser/google_codes/browser.toml
new file mode 100644
index 0000000000..626dc57cac
--- /dev/null
+++ b/browser/components/search/test/browser/google_codes/browser.toml
@@ -0,0 +1,4 @@
+[DEFAULT]
+prefs = ["browser.search.region='DE'"]
+
+["../browser_google_behavior.js"]
diff --git a/browser/components/search/test/browser/head.js b/browser/components/search/test/browser/head.js
new file mode 100644
index 0000000000..7a45a9f4f5
--- /dev/null
+++ b/browser/components/search/test/browser/head.js
@@ -0,0 +1,133 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  AddonTestUtils: "resource://testing-common/AddonTestUtils.sys.mjs",
+  CustomizableUITestUtils:
+    "resource://testing-common/CustomizableUITestUtils.sys.mjs",
+  FormHistory: "resource://gre/modules/FormHistory.sys.mjs",
+  FormHistoryTestUtils:
+    "resource://testing-common/FormHistoryTestUtils.sys.mjs",
+  PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
+  SearchTestUtils: "resource://testing-common/SearchTestUtils.sys.mjs",
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+  TelemetryTestUtils: "resource://testing-common/TelemetryTestUtils.sys.mjs",
+  UrlbarSearchUtils: "resource:///modules/UrlbarSearchUtils.sys.mjs",
+});
+
+ChromeUtils.defineLazyGetter(this, "UrlbarTestUtils", () => {
+  const { UrlbarTestUtils: module } = ChromeUtils.importESModule(
+    "resource://testing-common/UrlbarTestUtils.sys.mjs"
+  );
+  module.init(this);
+  return module;
+});
+
+let gCUITestUtils = new CustomizableUITestUtils(window);
+
+AddonTestUtils.initMochitest(this);
+SearchTestUtils.init(this);
+
+/**
+ * Recursively compare two objects and check that every property of expectedObj has the same value
+ * on actualObj.
+ *
+ * @param {object} expectedObj
+ *        The expected object to find.
+ * @param {object} actualObj
+ *        The object to inspect.
+ * @param {string} name
+ *        The name of the engine, used for test detail logging.
+ */
+function isSubObjectOf(expectedObj, actualObj, name) {
+  for (let prop in expectedObj) {
+    if (typeof expectedObj[prop] == "function") {
+      continue;
+    }
+    if (expectedObj[prop] instanceof Object) {
+      is(
+        actualObj[prop].length,
+        expectedObj[prop].length,
+        name + "[" + prop + "]"
+      );
+      isSubObjectOf(
+        expectedObj[prop],
+        actualObj[prop],
+        name + "[" + prop + "]"
+      );
+    } else {
+      is(actualObj[prop], expectedObj[prop], name + "[" + prop + "]");
+    }
+  }
+}
+
+function getLocale() {
+  return Services.locale.requestedLocale || undefined;
+}
+
+function promiseEvent(aTarget, aEventName, aPreventDefault) {
+  function cancelEvent(event) {
+    if (aPreventDefault) {
+      event.preventDefault();
+    }
+
+    return true;
+  }
+
+  return BrowserTestUtils.waitForEvent(aTarget, aEventName, false, cancelEvent);
+}
+
+// Get an array of the one-off buttons.
+function getOneOffs() {
+  let oneOffs = [];
+  let searchPopup = document.getElementById("PopupSearchAutoComplete");
+  let oneOffsContainer = searchPopup.searchOneOffsContainer;
+  let oneOff = oneOffsContainer.querySelector(".search-panel-one-offs");
+  for (oneOff = oneOff.firstChild; oneOff; oneOff = oneOff.nextSibling) {
+    if (oneOff.nodeType == Node.ELEMENT_NODE) {
+      oneOffs.push(oneOff);
+    }
+  }
+  return oneOffs;
+}
+
+async function typeInSearchField(browser, text, fieldName) {
+  await SpecialPowers.spawn(
+    browser,
+    [[fieldName, text]],
+    async function ([contentFieldName, contentText]) {
+      // Put the focus on the search box.
+      let searchInput = content.document.getElementById(contentFieldName);
+      searchInput.focus();
+      searchInput.value = contentText;
+    }
+  );
+}
+
+async function searchInSearchbar(inputText, win = window) {
+  await new Promise(r => waitForFocus(r, win));
+  let sb = win.BrowserSearch.searchBar;
+  // Write the search query in the searchbar.
+  sb.focus();
+  sb.value = inputText;
+  sb.textbox.controller.startSearch(inputText);
+  // Wait for the popup to show.
+  await BrowserTestUtils.waitForEvent(sb.textbox.popup, "popupshown");
+  // And then for the search to complete.
+  await TestUtils.waitForCondition(
+    () =>
+      sb.textbox.controller.searchStatus >=
+      Ci.nsIAutoCompleteController.STATUS_COMPLETE_NO_MATCH,
+    "The search in the searchbar must complete."
+  );
+  return sb.textbox.popup;
+}
+
+function clearSearchbarHistory(win = window) {
+  info("cleanup the search history");
+  return FormHistory.update({ op: "remove", fieldname: "searchbar-history" });
+}
+
+registerCleanupFunction(async () => {
+  await PlacesUtils.history.clear();
+});
diff --git a/browser/components/search/test/browser/mozsearch.sjs b/browser/components/search/test/browser/mozsearch.sjs
new file mode 100644
index 0000000000..bde867c93e
--- /dev/null
+++ b/browser/components/search/test/browser/mozsearch.sjs
@@ -0,0 +1,11 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function handleRequest(req, resp) {
+  resp.setHeader("Content-Type", "text/html", false);
+  if (req.hasHeader("Origin") && req.getHeader("Origin") != "null") {
+    resp.write("error");
+    return;
+  }
+  resp.write("hello world");
+}
diff --git a/browser/components/search/test/browser/opensearch.html b/browser/components/search/test/browser/opensearch.html
new file mode 100644
index 0000000000..00620e3bcc
--- /dev/null
+++ b/browser/components/search/test/browser/opensearch.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<link rel="search" type="application/opensearchdescription+xml" title="engine1" href="http://mochi.test:8888/browser/browser/components/search/test/browser/testEngine.xml">
+<link rel="search" type="application/opensearchdescription+xml" title="engine2" href="http://mochi.test:8888/browser/browser/components/search/test/browser/testEngine_mozsearch.xml">
+<link rel="search" type="application/opensearchdescription+xml" title="engineInvalid" href="http://mochi.test:8888/browser/browser/components/search/test/browser/testEngine_404.xml">
+</head>
+<body></body>
+</html>
diff --git a/browser/components/search/test/browser/search-engines/basic/manifest.json b/browser/components/search/test/browser/search-engines/basic/manifest.json
new file mode 100644
index 0000000000..63ec838bee
--- /dev/null
+++ b/browser/components/search/test/browser/search-engines/basic/manifest.json
@@ -0,0 +1,20 @@
+{
+  "name": "basic",
+  "manifest_version": 2,
+  "version": "1.0",
+  "description": "basic",
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "basic@search.mozilla.org"
+    }
+  },
+  "hidden": true,
+  "chrome_settings_overrides": {
+    "search_provider": {
+      "name": "basic",
+      "keyword": "@basic",
+      "search_url": "https://mochi.test:8888/browser/browser/components/search/test/browser/?search={searchTerms}&foo=1",
+      "suggest_url": "https://example.com/browser/browser/components/search/test/browser/trendingSuggestionEngine.sjs?richsuggestions=true&query={searchTerms}"
+    }
+  }
+}
diff --git a/browser/components/search/test/browser/search-engines/private/manifest.json b/browser/components/search/test/browser/search-engines/private/manifest.json
new file mode 100644
index 0000000000..69ef8b29ef
--- /dev/null
+++ b/browser/components/search/test/browser/search-engines/private/manifest.json
@@ -0,0 +1,20 @@
+{
+  "name": "private",
+  "manifest_version": 2,
+  "version": "1.0",
+  "description": "A test private engine",
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "private@search.mozilla.org"
+    }
+  },
+  "hidden": true,
+  "chrome_settings_overrides": {
+    "search_provider": {
+      "name": "private",
+      "keyword": "@private",
+      "search_url": "https://example.com",
+      "suggest_url": "https://example.com?search={searchTerms}"
+    }
+  }
+}
diff --git a/browser/components/search/test/browser/searchSuggestionEngine.sjs b/browser/components/search/test/browser/searchSuggestionEngine.sjs
new file mode 100644
index 0000000000..1da20124a4
--- /dev/null
+++ b/browser/components/search/test/browser/searchSuggestionEngine.sjs
@@ -0,0 +1,53 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+let gTimer;
+
+function handleRequest(req, resp) {
+  // Parse the query params.  If the params aren't in the form "foo=bar", then
+  // treat the entire query string as a search string.
+  let params = req.queryString.split("&").reduce((memo, pair) => {
+    let [key, val] = pair.split("=");
+    if (!val) {
+      // This part isn't in the form "foo=bar".  Treat it as the search string
+      // (the "query").
+      val = key;
+      key = "query";
+    }
+    memo[decode(key)] = decode(val);
+    return memo;
+  }, {});
+
+  let timeout = parseInt(params.timeout);
+  if (timeout) {
+    // Write the response after a timeout.
+    resp.processAsync();
+    gTimer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+    gTimer.init(
+      () => {
+        writeResponse(params, resp);
+        resp.finish();
+      },
+      timeout,
+      Ci.nsITimer.TYPE_ONE_SHOT
+    );
+    return;
+  }
+
+  writeResponse(params, resp);
+}
+
+function writeResponse(params, resp) {
+  // Echo back the search string with "foo" and "bar" appended.
+  let suffixes = ["foo", "bar"];
+  let data = [params.query, suffixes.map(s => params.query + s)];
+  resp.setHeader("Content-Type", "application/json", false);
+
+  let json = JSON.stringify(data);
+  let utf8 = String.fromCharCode(...new TextEncoder().encode(json));
+  resp.write(utf8);
+}
+
+function decode(str) {
+  return decodeURIComponent(str.replace(/\+/g, encodeURIComponent(" ")));
+}
diff --git a/browser/components/search/test/browser/telemetry/browser.toml b/browser/components/search/test/browser/telemetry/browser.toml
new file mode 100644
index 0000000000..49d8f256aa
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser.toml
@@ -0,0 +1,197 @@
+[DEFAULT]
+tags = "search-telemetry"
+support-files = ["head.js", "head-spa.js"]
+prefs = ["browser.search.log=true"]
+
+["browser_search_glean_serp_event_telemetry_categorization_enabled_by_nimbus_variable.js"]
+support-files = [
+  "domain_category_mappings.json",
+  "searchTelemetryDomainCategorizationReporting.html",
+]
+
+["browser_search_glean_serp_event_telemetry_enabled_by_nimbus_variable.js"]
+support-files = ["searchTelemetryAd.html"]
+
+["browser_search_telemetry_abandonment.js"]
+support-files = [
+  "searchTelemetry.html",
+  "searchTelemetryAd.html",
+  "searchTelemetryAd_components_text.html",
+]
+
+["browser_search_telemetry_aboutHome.js"]
+
+["browser_search_telemetry_adImpression_component.js"]
+support-files = [
+  "searchTelemetryAd_components_carousel.html",
+  "searchTelemetryAd_components_carousel_below_the_fold.html",
+  "searchTelemetryAd_components_carousel_doubled.html",
+  "searchTelemetryAd_components_carousel_first_element_non_visible.html",
+  "searchTelemetryAd_components_carousel_hidden.html",
+  "searchTelemetryAd_components_carousel_outer_container.html",
+  "searchTelemetryAd_components_text.html",
+  "searchTelemetryAd_components_visibility.html",
+  "serp.css",
+]
+
+["browser_search_telemetry_categorization_timing.js"]
+
+["browser_search_telemetry_content.js"]
+
+["browser_search_telemetry_domain_categorization_ad_values.js"]
+support-files = ["searchTelemetryDomainCategorizationReporting.html"]
+
+["browser_search_telemetry_domain_categorization_download_timer.js"]
+support-files = ["domain_category_mappings.json"]
+
+["browser_search_telemetry_domain_categorization_extraction.js"]
+support-files = ["searchTelemetryDomainExtraction.html"]
+
+["browser_search_telemetry_domain_categorization_region.js"]
+support-files = ["searchTelemetryDomainCategorizationReporting.html"]
+
+["browser_search_telemetry_domain_categorization_reporting.js"]
+support-files = [
+  "searchTelemetryDomainCategorizationReporting.html",
+  "searchTelemetryDomainCategorizationCapProcessedDomains.html",
+]
+
+["browser_search_telemetry_domain_categorization_reporting_timer.js"]
+support-files = ["searchTelemetryDomainCategorizationReporting.html"]
+
+["browser_search_telemetry_domain_categorization_reporting_timer_wakeup.js"]
+support-files = ["searchTelemetryDomainCategorizationReporting.html"]
+
+["browser_search_telemetry_engagement_cached.js"]
+support-files = [
+  "cacheable.html",
+  "cacheable.html^headers^",
+  "searchTelemetryAd_components_text.html",
+  "serp.css",
+]
+
+["browser_search_telemetry_engagement_cached_serp.js"]
+support-files = [
+  "searchTelemetryAd_searchbox.html",
+  "searchTelemetryAd_searchbox.html^headers^",
+]
+
+["browser_search_telemetry_engagement_content.js"]
+support-files = [
+  "searchTelemetryAd_searchbox_with_content.html",
+  "searchTelemetryAd_searchbox_with_content.html^headers^",
+  "searchTelemetryAd_searchbox_with_content_redirect.html",
+  "searchTelemetryAd_searchbox_with_content_redirect.html^headers^",
+  "serp.css",
+]
+
+["browser_search_telemetry_engagement_multiple_tabs.js"]
+support-files = [
+  "searchTelemetryAd_searchbox_with_content.html",
+  "searchTelemetryAd_searchbox_with_content.html^headers^",
+]
+
+["browser_search_telemetry_engagement_non_ad.js"]
+support-files = [
+  "searchTelemetryAd_searchbox_with_content.html",
+  "searchTelemetryAd_searchbox_with_content.html^headers^",
+  "serp.css",
+]
+
+["browser_search_telemetry_engagement_query_params.js"]
+support-files = [
+  "searchTelemetryAd_components_query_parameters.html",
+  "serp.css",
+]
+
+["browser_search_telemetry_engagement_redirect.js"]
+support-files = [
+  "redirect_ad.sjs",
+  "redirect_final.sjs",
+  "redirect_once.sjs",
+  "redirect_thrice.sjs",
+  "redirect_twice.sjs",
+  "searchTelemetryAd_components_text.html",
+  "searchTelemetryAd_nonAdsLink_redirect.html",
+  "searchTelemetryAd_nonAdsLink_redirect.html^headers^",
+  "searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html",
+  "searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html^headers^",
+  "serp.css",
+]
+
+["browser_search_telemetry_engagement_target.js"]
+support-files = [
+  "searchTelemetryAd_components_text.html",
+  "searchTelemetryAd_searchbox.html",
+  "searchTelemetryAd_searchbox.html^headers^",
+  "serp.css",
+]
+
+["browser_search_telemetry_new_window.js"]
+support-files = ["searchTelemetry.html", "searchTelemetryAd.html"]
+
+["browser_search_telemetry_private.js"]
+support-files = ["searchTelemetry.html", "searchTelemetryAd.html", "serp.css"]
+
+["browser_search_telemetry_remote_settings_sync.js"]
+support-files = ["searchTelemetryAd.html", "serp.css"]
+
+["browser_search_telemetry_searchbar.js"]
+https_first_disabled = true
+support-files = [
+  "telemetrySearchSuggestions.sjs",
+  "telemetrySearchSuggestions.xml",
+]
+
+["browser_search_telemetry_shopping.js"]
+support-files = ["searchTelemetryAd_shopping.html"]
+
+["browser_search_telemetry_sources.js"]
+support-files = ["searchTelemetry.html", "searchTelemetryAd.html"]
+
+["browser_search_telemetry_sources_about.js"]
+support-files = ["searchTelemetry.html", "searchTelemetryAd.html"]
+
+["browser_search_telemetry_sources_ads.js"]
+support-files = ["searchTelemetry.html", "searchTelemetryAd.html"]
+
+["browser_search_telemetry_sources_ads_clicks.js"]
+support-files = ["searchTelemetryAd.html"]
+
+["browser_search_telemetry_sources_ads_data_attributes.js"]
+support-files = [
+  "searchTelemetryAd_dataAttributes.html",
+  "searchTelemetryAd_dataAttributes_href.html",
+  "searchTelemetryAd_dataAttributes_none.html",
+]
+
+["browser_search_telemetry_sources_ads_load_events.js"]
+support-files = [
+  "slow_loading_page_with_ads_on_load_event.html",
+  "slow_loading_page_with_ads.html",
+  "slow_loading_page_with_ads.sjs",
+]
+
+["browser_search_telemetry_sources_in_content.js"]
+support-files = ["searchTelemetryAd_searchbox_with_content.html"]
+
+["browser_search_telemetry_sources_navigation.js"]
+support-files = ["searchTelemetry.html", "searchTelemetryAd.html"]
+
+["browser_search_telemetry_sources_webextension.js"]
+support-files = ["searchTelemetry.html", "searchTelemetryAd.html"]
+
+["browser_search_telemetry_spa_in_content.js"]
+support-files = ["searchTelemetrySinglePageApp.html"]
+skip-if = [
+  "(os == 'linux') && tsan && verify",
+] # Can fail on ad_count visibility
+
+["browser_search_telemetry_spa_multi_provider.js"]
+support-files = ["searchTelemetrySinglePageApp.html"]
+
+["browser_search_telemetry_spa_multi_tab.js"]
+support-files = ["searchTelemetrySinglePageApp.html"]
+
+["browser_search_telemetry_spa_single_tab.js"]
+support-files = ["searchTelemetrySinglePageApp.html"]
diff --git a/browser/components/search/test/browser/telemetry/browser_search_glean_serp_event_telemetry_categorization_enabled_by_nimbus_variable.js b/browser/components/search/test/browser/telemetry/browser_search_glean_serp_event_telemetry_categorization_enabled_by_nimbus_variable.js
new file mode 100644
index 0000000000..ed71a7c5ed
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_glean_serp_event_telemetry_categorization_enabled_by_nimbus_variable.js
@@ -0,0 +1,186 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test to verify we can toggle the Glean SERP event telemetry for SERP
+// categorization feature via a Nimbus variable.
+
+const lazy = {};
+const TELEMETRY_PREF =
+  "browser.search.serpEventTelemetryCategorization.enabled";
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  ExperimentAPI: "resource://nimbus/ExperimentAPI.sys.mjs",
+  ExperimentFakes: "resource://testing-common/NimbusTestUtils.sys.mjs",
+  SearchSERPDomainToCategoriesMap:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+});
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "serpEventsCategorizationEnabled",
+  TELEMETRY_PREF,
+  false
+);
+
+// This is required to trigger and properly categorize a SERP.
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [/^https:\/\/example.com/],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    domainExtraction: {
+      ads: [
+        {
+          selectors: "[data-ad-domain]",
+          method: "data-attribute",
+          options: {
+            dataAttributeKey: "adDomain",
+          },
+        },
+        {
+          selectors: ".ad",
+          method: "href",
+          options: {
+            queryParamKey: "ad_domain",
+          },
+        },
+      ],
+      nonAds: [
+        {
+          selectors: "#results .organic a",
+          method: "href",
+        },
+      ],
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  await insertRecordIntoCollectionAndSync();
+  // If the categorization preference is enabled, we should also wait for the
+  // sync event to update the domain to categories map.
+  if (lazy.serpEventsCategorizationEnabled) {
+    await waitForDomainToCategoriesUpdate();
+  }
+
+  registerCleanupFunction(async () => {
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    await SpecialPowers.popPrefEnv();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_enable_experiment_when_pref_is_not_enabled() {
+  let prefBranch = Services.prefs.getDefaultBranch("");
+  let originalPrefValue = prefBranch.getBoolPref(TELEMETRY_PREF);
+
+  // Ensure the build being tested has the preference value as false.
+  // Changing the preference in the test must be done on the default branch
+  // because in the telemetry code, we're referencing the preference directly
+  // instead of through NimbusFeatures. Enrolling in an experiment will change
+  // the default branch, and not overwrite the user branch.
+  prefBranch.setBoolPref(TELEMETRY_PREF, false);
+
+  Assert.equal(
+    lazy.serpEventsCategorizationEnabled,
+    false,
+    "serpEventsCategorizationEnabled should be false when not enrolled in experiment and the default value is false."
+  );
+
+  await lazy.ExperimentAPI.ready();
+
+  info("Enroll in experiment.");
+  let updateComplete = waitForDomainToCategoriesUpdate();
+
+  let doExperimentCleanup = await lazy.ExperimentFakes.enrollWithFeatureConfig(
+    {
+      featureId: NimbusFeatures.search.featureId,
+      value: {
+        serpEventTelemetryCategorizationEnabled: true,
+      },
+    },
+    { isRollout: true }
+  );
+
+  Assert.equal(
+    lazy.serpEventsCategorizationEnabled,
+    true,
+    "serpEventsCategorizationEnabled should be true when enrolled in experiment."
+  );
+
+  await updateComplete;
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a sample SERP with organic results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  await BrowserTestUtils.removeTab(tab);
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+  resetTelemetry();
+
+  info("End experiment.");
+  await doExperimentCleanup();
+
+  Assert.equal(
+    lazy.serpEventsCategorizationEnabled,
+    false,
+    "serpEventsCategorizationEnabled should be false after experiment."
+  );
+
+  Assert.ok(
+    lazy.SearchSERPDomainToCategoriesMap.empty,
+    "Domain to categories map should be empty."
+  );
+
+  info("Load a sample SERP with organic results.");
+  tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  // Wait an arbitrary amount for a possible categorization.
+  // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+  await new Promise(resolve => setTimeout(resolve, 1500));
+  BrowserTestUtils.removeTab(tab);
+
+  assertCategorizationValues([]);
+
+  // Clean up.
+  prefBranch.setBoolPref(TELEMETRY_PREF, originalPrefValue);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_glean_serp_event_telemetry_enabled_by_nimbus_variable.js b/browser/components/search/test/browser/telemetry/browser_search_glean_serp_event_telemetry_enabled_by_nimbus_variable.js
new file mode 100644
index 0000000000..096178499b
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_glean_serp_event_telemetry_enabled_by_nimbus_variable.js
@@ -0,0 +1,167 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test to verify we can toggle the Glean SERP event telemetry feature via a
+// Nimbus variable.
+
+const lazy = {};
+
+const TELEMETRY_PREF = "browser.search.serpEventTelemetry.enabled";
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  ExperimentAPI: "resource://nimbus/ExperimentAPI.sys.mjs",
+  ExperimentFakes: "resource://testing-common/NimbusTestUtils.sys.mjs",
+});
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "serpEventsEnabled",
+  TELEMETRY_PREF,
+  false
+);
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?.html/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+async function verifyEventsRecorded() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.TAB_CLOSE,
+      },
+    },
+  ]);
+}
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    await SpecialPowers.popPrefEnv();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_enable_experiment_when_pref_is_not_enabled() {
+  let prefBranch = Services.prefs.getDefaultBranch("");
+  let originalPrefValue = prefBranch.getBoolPref(TELEMETRY_PREF);
+
+  // Ensure the build being tested has the preference value as false.
+  // Changing the preference in the test must be done on the default branch
+  // because in the telemetry code, we're referencing the preference directly
+  // instead of through NimbusFeatures. Enrolling in an experiment will change
+  // the default branch, and not overwrite the user branch.
+  prefBranch.setBoolPref(TELEMETRY_PREF, false);
+
+  Assert.equal(
+    lazy.serpEventsEnabled,
+    false,
+    "serpEventsEnabled should be false when not enrolled in experiment."
+  );
+
+  await lazy.ExperimentAPI.ready();
+
+  let doExperimentCleanup = await lazy.ExperimentFakes.enrollWithFeatureConfig(
+    {
+      featureId: NimbusFeatures.search.featureId,
+      value: {
+        serpEventTelemetryEnabled: true,
+      },
+    },
+    { isRollout: true }
+  );
+
+  Assert.equal(
+    lazy.serpEventsEnabled,
+    true,
+    "serpEventsEnabled should be true when enrolled in experiment."
+  );
+
+  // To ensure Nimbus set "browser.search.serpEventTelemetry.enabled" to true,
+  // we test that an impression, ad_impression and abandonment event are
+  // recorded correctly.
+  await verifyEventsRecorded();
+
+  await doExperimentCleanup();
+
+  Assert.equal(
+    lazy.serpEventsEnabled,
+    false,
+    "serpEventsEnabled should be false after experiment."
+  );
+
+  // Clean up.
+  prefBranch.setBoolPref(TELEMETRY_PREF, originalPrefValue);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_abandonment.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_abandonment.js
new file mode 100644
index 0000000000..0c1d8b8234
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_abandonment.js
@@ -0,0 +1,294 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests for the Glean SERP abandonment event
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_tab_close() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetry.html")
+  );
+
+  await waitForPageWithAdImpressions();
+
+  BrowserTestUtils.removeTab(tab);
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.TAB_CLOSE,
+      },
+    },
+  ]);
+});
+
+add_task(async function test_window_close() {
+  resetTelemetry();
+
+  let serpUrl = getSERPUrl("searchTelemetry.html");
+  let otherWindow = await BrowserTestUtils.openNewBrowserWindow();
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    otherWindow.gBrowser,
+    false,
+    serpUrl
+  );
+  BrowserTestUtils.startLoadingURIString(otherWindow.gBrowser, serpUrl);
+  await browserLoadedPromise;
+  await waitForPageWithAdImpressions();
+
+  await BrowserTestUtils.closeWindow(otherWindow);
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.WINDOW_CLOSE,
+      },
+    },
+  ]);
+});
+
+add_task(async function test_navigation_via_urlbar() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetry.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    gBrowser,
+    false,
+    "https://www.example.com/"
+  );
+  BrowserTestUtils.startLoadingURIString(gBrowser, "https://www.example.com");
+  await browserLoadedPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_navigation_via_back_button() {
+  resetTelemetry();
+
+  let exampleUrl = "https://example.com/";
+  let serpUrl = getSERPUrl("searchTelemetry.html");
+  await BrowserTestUtils.withNewTab(exampleUrl, async browser => {
+    info("example.com is now loaded.");
+
+    let pageLoadPromise = BrowserTestUtils.browserLoaded(
+      browser,
+      false,
+      serpUrl
+    );
+    BrowserTestUtils.startLoadingURIString(browser, serpUrl);
+    await pageLoadPromise;
+    info("Serp is now loaded.");
+
+    let pageShowPromise = BrowserTestUtils.waitForContentEvent(
+      browser,
+      "pageshow"
+    );
+    browser.goBack();
+    await pageShowPromise;
+
+    info("Previous page (example.com) is now loaded after back navigation.");
+  });
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+  ]);
+});
+
+add_task(async function test_click_ad() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd.html")
+  );
+
+  await TestUtils.waitForCondition(() => {
+    let adImpressions = Glean.serp.adImpression.testGetValue() ?? [];
+    return adImpressions.length;
+  }, "Should have received an ad impression.");
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a",
+    {},
+    gBrowser.selectedBrowser
+  );
+  await browserLoadedPromise;
+
+  Assert.equal(
+    !!Glean.serp.abandonment.testGetValue(),
+    false,
+    "Should not have any abandonment events."
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_click_non_ad() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd_components_text.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#non_ads_link",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  Assert.equal(
+    !!Glean.serp.abandonment.testGetValue(),
+    false,
+    "Should not have any abandonment events."
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_without_components() {
+  // Mock a provider that doesn't have components.
+  let providerInfo = [
+    {
+      ...TEST_PROVIDER_INFO[0],
+      components: [],
+    },
+  ];
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(providerInfo);
+  await waitForIdle();
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd.html")
+  );
+
+  // We shouldn't expect a SERP impression, so instead wait roughly
+  // around how long it would usually take to receive an impression following
+  // a page load.
+  await promiseWaitForAdLinkCheck();
+  Assert.equal(
+    !!Glean.serp.impression.testGetValue(),
+    false,
+    "Should not have any impression events."
+  );
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    gBrowser,
+    false,
+    "https://www.example.com/"
+  );
+  BrowserTestUtils.startLoadingURIString(gBrowser, "https://www.example.com");
+  await browserLoadedPromise;
+
+  Assert.equal(
+    !!Glean.serp.abandonment.testGetValue(),
+    false,
+    "Should not have any abandonment events."
+  );
+
+  BrowserTestUtils.removeTab(tab);
+
+  // Allow subsequent tests to use the default provider.
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_aboutHome.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_aboutHome.js
new file mode 100644
index 0000000000..9e9af43698
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_aboutHome.js
@@ -0,0 +1,135 @@
+"use strict";
+
+const SCALAR_ABOUT_HOME = "browser.engagement.navigation.about_home";
+
+add_setup(async function () {
+  // about:home uses IndexedDB. However, the test finishes too quickly and doesn't
+  // allow it enougth time to save. So it throws. This disables all the uncaught
+  // exception in this file and that's the reason why we split about:home tests
+  // out of the other UsageTelemetry files.
+  ignoreAllUncaughtExceptions();
+
+  // Create two new search engines. Mark one as the default engine, so
+  // the test don't crash. We need to engines for this test as the searchbar
+  // in content doesn't display the default search engine among the one-off engines.
+  await SearchTestUtils.installSearchExtension(
+    {
+      name: "MozSearch",
+      keyword: "mozalias",
+    },
+    { setAsDefault: true }
+  );
+  await SearchTestUtils.installSearchExtension({
+    name: "MozSearch2",
+    keyword: "mozalias2",
+  });
+
+  // Move the second engine at the beginning of the one-off list.
+  let engineOneOff = Services.search.getEngineByName("MozSearch2");
+  await Services.search.moveEngine(engineOneOff, 0);
+
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  // Enable event recording for the events tested here.
+  Services.telemetry.setEventRecordingEnabled("navigation", true);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [
+        "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar",
+        false,
+      ],
+    ],
+  });
+
+  registerCleanupFunction(async function () {
+    await PlacesUtils.history.clear();
+    Services.telemetry.setEventRecordingEnabled("navigation", false);
+    Services.telemetry.canRecordExtended = oldCanRecord;
+  });
+});
+
+add_task(async function test_abouthome_activitystream_simpleQuery() {
+  // Let's reset the counts.
+  Services.telemetry.clearScalars();
+  Services.telemetry.clearEvents();
+  Services.fog.testResetFOG();
+  let search_hist =
+    TelemetryTestUtils.getAndClearKeyedHistogram("SEARCH_COUNTS");
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  info("Load about:home.");
+  BrowserTestUtils.startLoadingURIString(tab.linkedBrowser, "about:home");
+  await BrowserTestUtils.browserStopped(tab.linkedBrowser, "about:home");
+
+  info("Wait for ContentSearchUI search provider to initialize.");
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    await ContentTaskUtils.waitForCondition(
+      () => content.wrappedJSObject.gContentSearchController.defaultEngine
+    );
+  });
+
+  info("Trigger a simple search, just test + enter.");
+  let p = BrowserTestUtils.browserStopped(
+    tab.linkedBrowser,
+    "https://example.com/?q=test+query"
+  );
+  await typeInSearchField(
+    tab.linkedBrowser,
+    "test query",
+    "newtab-search-text"
+  );
+  await BrowserTestUtils.synthesizeKey("VK_RETURN", {}, tab.linkedBrowser);
+  await p;
+
+  // Check if the scalars contain the expected values.
+  const scalars = TelemetryTestUtils.getProcessScalars("parent", true, false);
+  TelemetryTestUtils.assertKeyedScalar(
+    scalars,
+    SCALAR_ABOUT_HOME,
+    "search_enter",
+    1
+  );
+  Assert.equal(
+    Object.keys(scalars[SCALAR_ABOUT_HOME]).length,
+    1,
+    "This search must only increment one entry in the scalar."
+  );
+
+  // Make sure SEARCH_COUNTS contains identical values.
+  TelemetryTestUtils.assertKeyedHistogramSum(
+    search_hist,
+    "other-MozSearch.abouthome",
+    1
+  );
+
+  // Also check events.
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "about_home",
+        value: "enter",
+        extra: { engine: "other-MozSearch" },
+      },
+    ],
+    { category: "navigation", method: "search" }
+  );
+
+  // Also also check Glean events.
+  const record = Glean.newtabSearch.issued.testGetValue();
+  Assert.ok(!!record, "Must have recorded a search issuance");
+  Assert.equal(record.length, 1, "One search, one event");
+  Assert.deepEqual(
+    {
+      search_access_point: "about_home",
+      telemetry_id: "other-MozSearch",
+    },
+    record[0].extra,
+    "Must have recorded the expected information."
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_adImpression_component.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_adImpression_component.js
new file mode 100644
index 0000000000..8049406d40
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_adImpression_component.js
@@ -0,0 +1,502 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const WINDOW_HEIGHT = 768;
+const WINDOW_WIDTH = 1024;
+
+// Note: example.org is used for the SERP page, and example.com is used to serve
+// the ads. This is done to simulate different domains like the real servers.
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+        included: {
+          parent: {
+            selector: ".moz-carousel",
+          },
+          children: [
+            {
+              selector: ".moz-carousel-card",
+              countChildren: true,
+            },
+          ],
+        },
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+        included: {
+          parent: {
+            selector: ".refined-search-buttons",
+          },
+          children: [
+            {
+              selector: "a",
+            },
+          ],
+        },
+        topDown: true,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        included: {
+          parent: {
+            selector: ".moz_ad",
+          },
+          children: [
+            {
+              selector: ".multi-col",
+              type: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+            },
+          ],
+        },
+        excluded: {
+          parent: {
+            selector: ".rhs",
+          },
+        },
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_SIDEBAR,
+        included: {
+          parent: {
+            selector: ".rhs",
+          },
+        },
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+async function promiseResize(width, height) {
+  return TestUtils.waitForCondition(() => {
+    return window.outerWidth === width && window.outerHeight === height;
+  }, "Waiting for window to resize");
+}
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  // The tests evaluate whether or not ads are visible depending on whether
+  // they are within the view of the window. To ensure the test results
+  // are consistent regardless of where they are launched,
+  // set the window size to something reasonable.
+  let originalWidth = window.outerWidth;
+  let originalHeight = window.outerHeight;
+  window.resizeTo(WINDOW_WIDTH, WINDOW_HEIGHT);
+  await promiseResize(WINDOW_WIDTH, WINDOW_HEIGHT);
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    window.resizeTo(originalWidth, originalHeight);
+    await promiseResize(originalWidth, originalHeight);
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_ad_impressions_with_one_carousel() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_carousel.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+          ads_loaded: "4",
+          ads_visible: "3",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// This is to ensure we're not counting two carousel components as two
+// separate components but as one record with a sum of the results.
+add_task(async function test_ad_impressions_with_two_carousels() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_carousel_doubled.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  // This is to ensure we've seen the other carousel regardless the
+  // size of the browser window.
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let el = content.document
+      .getElementById("second-ad")
+      .getBoundingClientRect();
+    // The 100 is just to guarantee we've scrolled past the element.
+    content.scrollTo(0, el.top + el.height + 100);
+  });
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+          ads_loaded: "8",
+          ads_visible: "6",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(
+  async function test_ad_impressions_with_carousels_with_outer_container() {
+    resetTelemetry();
+    let url = getSERPUrl(
+      "searchTelemetryAd_components_carousel_outer_container.html"
+    );
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+    await waitForPageWithAdImpressions();
+
+    assertSERPTelemetry([
+      {
+        impression: {
+          provider: "example",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+            ads_loaded: "4",
+            ads_visible: "3",
+            ads_hidden: "0",
+          },
+        ],
+      },
+    ]);
+
+    BrowserTestUtils.removeTab(tab);
+  }
+);
+
+add_task(async function test_ad_impressions_with_carousels_tabhistory() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_carousel.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  BrowserTestUtils.startLoadingURIString(
+    tab.linkedBrowser,
+    "https://www.example.com/some_url"
+  );
+  await browserLoadedPromise;
+
+  // Reset telemetry because we care about the telemetry upon going back.
+  resetTelemetry();
+
+  let pageShowPromise = BrowserTestUtils.waitForContentEvent(
+    tab.linkedBrowser,
+    "pageshow"
+  );
+  tab.linkedBrowser.goBack();
+  await pageShowPromise;
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+          ads_loaded: "4",
+          ads_visible: "3",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_ad_impressions_with_hidden_carousels() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_carousel_hidden.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+          ads_loaded: "4",
+          ads_visible: "0",
+          ads_hidden: "4",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_ad_impressions_with_carousel_scrolled_left() {
+  resetTelemetry();
+  let url = getSERPUrl(
+    "searchTelemetryAd_components_carousel_first_element_non_visible.html"
+  );
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+          ads_loaded: "4",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_ad_impressions_with_carousel_below_the_fold() {
+  resetTelemetry();
+  let url = getSERPUrl(
+    "searchTelemetryAd_components_carousel_below_the_fold.html"
+  );
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+          ads_loaded: "4",
+          ads_visible: "0",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_ad_impressions_with_text_links() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SIDEBAR,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// An ad is considered visible if at least one link is within the viewable
+// content area when the impression was taken. Since the user can scroll
+// the page before ad impression is recorded, we should ensure that an
+// ad that was scrolled onto the screen before the impression is taken is
+// properly recorded. Additionally, some ads might have a large content
+// area that extends beyond the viewable area, but as long as a single
+// ad link was viewable within the area, we should count the ads as visible.
+add_task(async function test_ad_visibility() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_visibility.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let el = content.document
+      .getElementById("second-ad")
+      .getBoundingClientRect();
+    // The 100 is just to guarantee we've scrolled past the element.
+    content.scrollTo(0, el.top + el.height + 100);
+  });
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "6",
+          ads_visible: "4",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_impressions_without_ads() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_categorization_timing.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_categorization_timing.js
new file mode 100644
index 0000000000..9ecc4e8d92
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_categorization_timing.js
@@ -0,0 +1,83 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Checks that telemetry on the runtime performance of categorizing the SERP
+ * works as normal.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_tab_contains_measurement() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd_components_text.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  await Services.fog.testFlushAllChildren();
+  Assert.ok(
+    Glean.serp.adImpression.testGetValue().length,
+    "Should have received ad impressions."
+  );
+
+  let durations = Glean.serp.categorizationDuration.testGetValue();
+  Assert.ok(durations.sum > 0, "Sum should be more than 0.");
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// If the user opened a SERP and closed it quickly or navigated away from it
+// and no ad impressions were recorded, we shouldn't record a measurement.
+add_task(async function test_before_ad_impressions_recorded() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd_components_text.html")
+  );
+  BrowserTestUtils.removeTab(tab);
+
+  Assert.ok(
+    !Glean.serp.adImpression.testGetValue(),
+    "Should not have an ad impression."
+  );
+
+  await Services.fog.testFlushAllChildren();
+  let durations = Glean.serp.categorizationDuration.testGetValue();
+  Assert.equal(durations, undefined, "Should not have received any values.");
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_content.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_content.js
new file mode 100644
index 0000000000..b17604badd
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_content.js
@@ -0,0 +1,204 @@
+"use strict";
+
+const BASE_PROBE_NAME = "browser.engagement.navigation.";
+const SCALAR_CONTEXT_MENU = BASE_PROBE_NAME + "contextmenu";
+const SCALAR_ABOUT_NEWTAB = BASE_PROBE_NAME + "about_newtab";
+
+add_setup(async function () {
+  // Create two new search engines. Mark one as the default engine, so
+  // the test don't crash. We need to engines for this test as the searchbar
+  // in content doesn't display the default search engine among the one-off engines.
+  await SearchTestUtils.installSearchExtension(
+    {
+      name: "MozSearch",
+      keyword: "mozalias",
+    },
+    { setAsDefault: true }
+  );
+  await SearchTestUtils.installSearchExtension({
+    name: "MozSearch2",
+    keyword: "mozalias2",
+  });
+
+  // Move the second engine at the beginning of the one-off list.
+  let engineOneOff = Services.search.getEngineByName("MozSearch2");
+  await Services.search.moveEngine(engineOneOff, 0);
+
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  // Enable event recording for the events tested here.
+  Services.telemetry.setEventRecordingEnabled("navigation", true);
+
+  registerCleanupFunction(async function () {
+    await PlacesUtils.history.clear();
+    Services.telemetry.setEventRecordingEnabled("navigation", false);
+    Services.telemetry.canRecordExtended = oldCanRecord;
+  });
+});
+
+add_task(async function test_context_menu() {
+  // Let's reset the Telemetry data.
+  Services.telemetry.clearScalars();
+  Services.telemetry.clearEvents();
+  let search_hist =
+    TelemetryTestUtils.getAndClearKeyedHistogram("SEARCH_COUNTS");
+
+  // Open a new tab with a page containing some text.
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "data:text/plain;charset=utf8,test%20search"
+  );
+
+  info("Select all the text in the page.");
+  await SpecialPowers.spawn(tab.linkedBrowser, [""], async function () {
+    return new Promise(resolve => {
+      content.document.addEventListener("selectionchange", () => resolve(), {
+        once: true,
+      });
+      content.document.getSelection().selectAllChildren(content.document.body);
+    });
+  });
+
+  info("Open the context menu.");
+  let contextMenu = document.getElementById("contentAreaContextMenu");
+  let popupPromise = BrowserTestUtils.waitForEvent(contextMenu, "popupshown");
+  BrowserTestUtils.synthesizeMouseAtCenter(
+    "body",
+    { type: "contextmenu", button: 2 },
+    gBrowser.selectedBrowser
+  );
+  await popupPromise;
+
+  info("Click on search.");
+  let searchItem = contextMenu.getElementsByAttribute(
+    "id",
+    "context-searchselect"
+  )[0];
+  contextMenu.activateItem(searchItem);
+
+  info("Validate the search metrics.");
+
+  // Telemetry is not updated synchronously here, we must wait for it.
+  await TestUtils.waitForCondition(() => {
+    const scalars = TelemetryTestUtils.getProcessScalars("parent", true, false);
+    return Object.keys(scalars[SCALAR_CONTEXT_MENU] || {}).length == 1;
+  }, "This search must increment one entry in the scalar.");
+
+  const scalars = TelemetryTestUtils.getProcessScalars("parent", true, false);
+  TelemetryTestUtils.assertKeyedScalar(
+    scalars,
+    SCALAR_CONTEXT_MENU,
+    "search",
+    1
+  );
+
+  // Make sure SEARCH_COUNTS contains identical values.
+  TelemetryTestUtils.assertKeyedHistogramSum(
+    search_hist,
+    "other-MozSearch.contextmenu",
+    1
+  );
+
+  // Also check events.
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "contextmenu",
+        value: null,
+        extra: { engine: "other-MozSearch" },
+      },
+    ],
+    { category: "navigation", method: "search" }
+  );
+
+  contextMenu.hidePopup();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_about_newtab() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [
+        "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar",
+        false,
+      ],
+    ],
+  });
+  // Let's reset the counts.
+  Services.telemetry.clearScalars();
+  Services.telemetry.clearEvents();
+  Services.fog.testResetFOG();
+  let search_hist =
+    TelemetryTestUtils.getAndClearKeyedHistogram("SEARCH_COUNTS");
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:newtab",
+    false
+  );
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    await ContentTaskUtils.waitForCondition(() => !content.document.hidden);
+  });
+
+  info("Trigger a simple serch, just text + enter.");
+  let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  await typeInSearchField(
+    tab.linkedBrowser,
+    "test query",
+    "newtab-search-text"
+  );
+  await BrowserTestUtils.synthesizeKey("VK_RETURN", {}, tab.linkedBrowser);
+  await p;
+
+  // Check if the scalars contain the expected values.
+  const scalars = TelemetryTestUtils.getProcessScalars("parent", true, false);
+  TelemetryTestUtils.assertKeyedScalar(
+    scalars,
+    SCALAR_ABOUT_NEWTAB,
+    "search_enter",
+    1
+  );
+  Assert.equal(
+    Object.keys(scalars[SCALAR_ABOUT_NEWTAB]).length,
+    1,
+    "This search must only increment one entry in the scalar."
+  );
+
+  // Make sure SEARCH_COUNTS contains identical values.
+  TelemetryTestUtils.assertKeyedHistogramSum(
+    search_hist,
+    "other-MozSearch.newtab",
+    1
+  );
+
+  // Also check events.
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "about_newtab",
+        value: "enter",
+        extra: { engine: "other-MozSearch" },
+      },
+    ],
+    { category: "navigation", method: "search" }
+  );
+
+  // Also also check Glean events.
+  const record = Glean.newtabSearch.issued.testGetValue();
+  Assert.ok(!!record, "Must have recorded a search issuance");
+  Assert.equal(record.length, 1, "One search, one event");
+  Assert.deepEqual(
+    {
+      search_access_point: "about_newtab",
+      telemetry_id: "other-MozSearch",
+    },
+    record[0].extra,
+    "Must have recorded the expected information."
+  );
+
+  BrowserTestUtils.removeTab(tab);
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_ad_values.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_ad_values.js
new file mode 100644
index 0000000000..ce18f64e9f
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_ad_values.js
@@ -0,0 +1,190 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * These tests check the number of ads clicked from a SERP containing a
+ * categorization impression. Existing tests already check for the counting ads
+ * and tracking clicks, and the categorization impression piggybacks off
+ * of it. Hence, this is just mostly a sanity check.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+});
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    // The search telemetry entry responsible for targeting the specific results.
+    domainExtraction: {
+      ads: [
+        {
+          selectors: "[data-ad-domain]",
+          method: "data-attribute",
+          options: {
+            dataAttributeKey: "adDomain",
+          },
+        },
+        {
+          selectors: ".ad",
+          method: "href",
+          options: {
+            queryParamKey: "ad_domain",
+          },
+        },
+      ],
+      nonAds: [
+        {
+          selectors: "#results .organic a",
+          method: "href",
+        },
+      ],
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+
+  let promise = waitForDomainToCategoriesUpdate();
+  await insertRecordIntoCollectionAndSync();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await promise;
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_load_serp_and_categorize() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  await BrowserTestUtils.removeTab(tab);
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+});
+
+add_task(async function test_load_serp_and_categorize_and_click_organic() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  promise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    ".organic a",
+    {},
+    tab.linkedBrowser
+  );
+  await promise;
+
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_and_categorize_and_click_sponsored() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a sample SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  promise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter("a.ad", {}, tab.linkedBrowser);
+  await promise;
+
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "1",
+      num_ads_visible: "2",
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_download_timer.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_download_timer.js
new file mode 100644
index 0000000000..d01141d826
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_download_timer.js
@@ -0,0 +1,313 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * This test ensures we are correctly restarting a download of an attachment
+ * after a failure. We simulate failures by not caching the attachment in
+ * Remote Settings.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPDomainToCategoriesMap:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+});
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [/^https:\/\/example.com/],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    // The search telemetry entry responsible for targeting the specific results.
+    domainExtraction: {
+      ads: [
+        {
+          selectors: "[data-ad-domain]",
+          method: "data-attribute",
+          options: {
+            dataAttributeKey: "adDomain",
+          },
+        },
+        {
+          selectors: ".ad",
+          method: "href",
+          options: {
+            queryParamKey: "ad_domain",
+          },
+        },
+      ],
+      nonAds: [
+        {
+          selectors: "#results .organic a",
+          method: "href",
+        },
+      ],
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+function waitForDownloadError() {
+  return TestUtils.consoleMessageObserved(msg => {
+    return (
+      typeof msg.wrappedJSObject.arguments?.[0] == "string" &&
+      msg.wrappedJSObject.arguments[0].includes("Could not download file:")
+    );
+  });
+}
+
+const client = RemoteSettings(TELEMETRY_CATEGORIZATION_KEY);
+const db = client.db;
+
+// Shorten the timer so that tests don't have to wait too long.
+const TIMEOUT_IN_MS = 250;
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+
+  await db.clear();
+
+  // Set the state of the pref to false so that tests toggle the preference,
+  // triggering the map to be updated.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", false]],
+  });
+
+  let defaultDownloadSettings = {
+    ...TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS,
+  };
+
+  // Use a much shorter interval from the default preference that when we
+  // simulate download failures, we don't have to wait long before another
+  // download attempt.
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.base = TIMEOUT_IN_MS;
+
+  // Normally we add random time to avoid a failure resulting in everyone
+  // hitting the network at once. For tests, we remove this unless explicitly
+  // testing.
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.minAdjust = 0;
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.maxAdjust = 0;
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+    TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS = {
+      ...defaultDownloadSettings,
+    };
+  });
+});
+
+add_task(async function test_download_after_failure() {
+  // Most cases, we should use a convenience function, but in this case,
+  // we want to explictly "forget" to include an attachment to cause a failure.
+  let { record, attachment } = await mockRecordWithAttachment({
+    id: "example_id",
+    version: 1,
+    filename: "domain_category_mappings.json",
+  });
+  await db.create(record);
+  await db.importChanges({}, Date.now());
+
+  let downloadError = waitForDownloadError();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await downloadError;
+
+  // In between the download failure and one of download retries, cache
+  // the attachment so that the next download attempt will be successful.
+  client.attachments.cacheImpl.set(record.id, attachment);
+  await TestUtils.topicObserved("domain-to-categories-map-update-complete");
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a sample SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  await BrowserTestUtils.removeTab(tab);
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_visible: "2",
+      num_ads_clicked: "0",
+    },
+  ]);
+
+  // Clean up.
+  await SpecialPowers.popPrefEnv();
+  await resetCategorizationCollection(record);
+});
+
+add_task(async function test_download_after_multiple_failures() {
+  let { record } = await mockRecordWithAttachment({
+    id: "example_id",
+    version: 1,
+    filename: "domain_category_mappings.json",
+  });
+  await db.create(record);
+  await db.importChanges({}, Date.now());
+
+  let downloadError = waitForDownloadError();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await downloadError;
+
+  // Following an initial download failure, the number of allowable retries
+  // should equal to the maximum number per session.
+  for (
+    let i = 0;
+    i < TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.maxTriesPerSession;
+    ++i
+  ) {
+    await waitForDownloadError();
+  }
+
+  // To ensure we didn't attempt another download, wait more than what another
+  // download error should take.
+  let consoleObserved = false;
+  let timeout = false;
+  let firstPromise = waitForDownloadError().then(() => {
+    consoleObserved = true;
+  });
+  let secondPromise = new Promise(resolve =>
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    setTimeout(resolve, TIMEOUT_IN_MS + 100)
+  ).then(() => (timeout = true));
+  await Promise.race([firstPromise, secondPromise]);
+  Assert.equal(consoleObserved, false, "Encountered download failure");
+  Assert.equal(timeout, true, "Timeout occured");
+
+  Assert.ok(SearchSERPDomainToCategoriesMap.empty, "Map is empty");
+
+  // Clean up.
+  await SpecialPowers.popPrefEnv();
+  await resetCategorizationCollection(record);
+});
+
+add_task(async function test_cancel_download_timer() {
+  let { record } = await mockRecordWithAttachment({
+    id: "example_id",
+    version: 1,
+    filename: "domain_category_mappings.json",
+  });
+  await db.create(record);
+  await db.importChanges({}, Date.now());
+
+  let downloadError = waitForDownloadError();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await downloadError;
+
+  // Changing the gating preference to false before the map is populated
+  // should cancel the download timer.
+  let observeCancel = TestUtils.consoleMessageObserved(msg => {
+    return (
+      typeof msg.wrappedJSObject.arguments?.[0] == "string" &&
+      msg.wrappedJSObject.arguments[0].includes(
+        "Cancel and nullify download timer."
+      )
+    );
+  });
+  await SpecialPowers.popPrefEnv();
+  await observeCancel;
+
+  // To ensure we don't attempt another download, wait a bit over how long the
+  // the download error should take.
+  let consoleObserved = false;
+  let timeout = false;
+  let firstPromise = waitForDownloadError().then(() => {
+    consoleObserved = true;
+  });
+  let secondPromise = new Promise(resolve =>
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    setTimeout(resolve, TIMEOUT_IN_MS + 100)
+  ).then(() => (timeout = true));
+  await Promise.race([firstPromise, secondPromise]);
+  Assert.equal(consoleObserved, false, "Encountered download failure");
+  Assert.equal(timeout, true, "Timeout occured");
+  Assert.ok(SearchSERPDomainToCategoriesMap.empty, "Map is empty");
+
+  // Clean up.
+  await SpecialPowers.popPrefEnv();
+  await resetCategorizationCollection(record);
+});
+
+add_task(async function test_download_adjust() {
+  // To test that we're actually adding a random delay to the base value,
+  // we set the base number to zero so that the next attempt should be
+  // instant but we'll wait in between 0 and 1000ms and expect the
+  // timer to elapse first.
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.base = 0;
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.minAdjust = 1000;
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.maxAdjust = 1000;
+
+  let { record } = await mockRecordWithAttachment({
+    id: "example_id",
+    version: 1,
+    filename: "domain_category_mappings.json",
+  });
+  await db.create(record);
+  await db.importChanges({}, Date.now());
+
+  let downloadError = waitForDownloadError();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await downloadError;
+
+  // The timer should finish before the next error.
+  let consoleObserved = false;
+  let timeout = false;
+  let firstPromise = waitForDownloadError().then(() => {
+    consoleObserved = true;
+  });
+  let secondPromise = new Promise(resolve =>
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    setTimeout(resolve, 250)
+  ).then(() => (timeout = true));
+  await Promise.race([firstPromise, secondPromise]);
+  Assert.equal(timeout, true, "Timeout occured");
+  Assert.equal(consoleObserved, false, "Encountered download failure");
+
+  await firstPromise;
+  Assert.equal(consoleObserved, true, "Encountered download failure");
+
+  // Clean up.
+  await SpecialPowers.popPrefEnv();
+  await resetCategorizationCollection(record);
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.base = TIMEOUT_IN_MS;
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.minAdjust = 0;
+  TELEMETRY_CATEGORIZATION_DOWNLOAD_SETTINGS.maxAdjust = 0;
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_extraction.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_extraction.js
new file mode 100644
index 0000000000..03ddb75481
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_extraction.js
@@ -0,0 +1,263 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * This test ensures we are correctly extracting domains from a SERP.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+});
+
+const TESTS = [
+  {
+    title: "Extract domain from href (absolute URL) - one link.",
+    extractorInfos: [
+      {
+        selectors:
+          '#test1 [data-layout="organic"] a[data-testid="result-title-a"]',
+        method: "href",
+      },
+    ],
+    expectedDomains: ["foobar.com"],
+  },
+  {
+    title: "Extract domain from href (absolute URL) - multiple links.",
+    extractorInfos: [
+      {
+        selectors:
+          '#test2 [data-layout="organic"] a[data-testid="result-title-a"]',
+        method: "href",
+      },
+    ],
+    expectedDomains: ["foo.com", "bar.com", "baz.com", "qux.com"],
+  },
+  {
+    title: "Extract domain from href (relative URL).",
+    extractorInfos: [
+      {
+        selectors:
+          '#test3 [data-layout="organic"] a[data-testid="result-title-a"]',
+        method: "href",
+      },
+    ],
+    expectedDomains: ["example.org"],
+  },
+  {
+    title: "Extract domain from data attribute - one link.",
+    extractorInfos: [
+      {
+        selectors: "#test4 [data-dtld]",
+        method: "data-attribute",
+        options: {
+          dataAttributeKey: "dtld",
+        },
+      },
+    ],
+    expectedDomains: ["www.abc.com"],
+  },
+  {
+    title: "Extract domain from data attribute - multiple links.",
+    extractorInfos: [
+      {
+        selectors: "#test5 [data-dtld]",
+        method: "data-attribute",
+        options: {
+          dataAttributeKey: "dtld",
+        },
+      },
+    ],
+    expectedDomains: [
+      "www.foo.com",
+      "www.bar.com",
+      "www.baz.com",
+      "www.qux.com",
+    ],
+  },
+  {
+    title: "Extract domain from an href's query param value.",
+    extractorInfos: [
+      {
+        selectors:
+          '#test6 .js-carousel-item-title, #test6 [data-layout="ad"] [data-testid="result-title-a"]',
+        method: "href",
+        options: {
+          queryParamKey: "ad_domain",
+        },
+      },
+    ],
+    expectedDomains: ["def.com"],
+  },
+  {
+    title:
+      "Extract domain from an href's query param value containing an href.",
+    extractorInfos: [
+      {
+        selectors: "#test7 a",
+        method: "href",
+        options: {
+          queryParamKey: "ad_domain",
+          queryParamValueIsHref: true,
+        },
+      },
+    ],
+    expectedDomains: ["def.com"],
+  },
+  {
+    title:
+      "The param value contains an invalid href while queryParamValueIsHref enabled.",
+    extractorInfos: [
+      {
+        selectors: "#test8 a",
+        method: "href",
+        options: {
+          queryParamKey: "ad_domain",
+          queryParamValueIsHref: true,
+        },
+      },
+    ],
+    expectedDomains: [],
+  },
+  {
+    title: "Param value is missing from the href.",
+    extractorInfos: [
+      {
+        selectors: "#test9 a",
+        method: "href",
+        options: {
+          queryParamKey: "ad_domain",
+          queryParamValueIsHref: true,
+        },
+      },
+    ],
+    expectedDomains: [],
+  },
+  {
+    title: "Extraction preserves order of domains within the page.",
+    extractorInfos: [
+      {
+        selectors:
+          '#test10 [data-layout="organic"] a[data-testid="result-title-a"]',
+        method: "href",
+      },
+      {
+        selectors: "#test10 [data-dtld]",
+        method: "data-attribute",
+        options: {
+          dataAttributeKey: "dtld",
+        },
+      },
+      {
+        selectors:
+          '#test10 .js-carousel-item-title, #test7 [data-layout="ad"] [data-testid="result-title-a"]',
+        method: "href",
+        options: {
+          queryParamKey: "ad_domain",
+        },
+      },
+    ],
+    expectedDomains: ["foobar.com", "www.abc.com", "def.com"],
+  },
+  {
+    title: "No elements match the selectors.",
+    extractorInfos: [
+      {
+        selectors:
+          '#test11 [data-layout="organic"] a[data-testid="result-title-a"]',
+        method: "href",
+      },
+    ],
+    expectedDomains: [],
+  },
+  {
+    title: "Data attribute is present, but value is missing.",
+    extractorInfos: [
+      {
+        selectors: "#test12 [data-dtld]",
+        method: "data-attribute",
+        options: {
+          dataAttributeKey: "dtld",
+        },
+      },
+    ],
+    expectedDomains: [],
+  },
+  {
+    title: "Query param is present, but value is missing.",
+    extractorInfos: [
+      {
+        selectors: '#test13 [data-layout="ad"] [data-testid="result-title-a"]',
+        method: "href",
+        options: {
+          queryParamKey: "ad_domain",
+        },
+      },
+    ],
+    expectedDomains: [],
+  },
+  {
+    title: "Non-standard URL scheme.",
+    extractorInfos: [
+      {
+        selectors:
+          '#test14 [data-layout="organic"] a[data-testid="result-title-a"]',
+        method: "href",
+      },
+    ],
+    expectedDomains: [],
+  },
+];
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.serpEventTelemetry.enabled", true],
+      ["browser.search.serpEventTelemetryCategorization.enabled", true],
+    ],
+  });
+
+  await SearchSERPTelemetry.init();
+
+  registerCleanupFunction(async () => {
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_domain_extraction_heuristics() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryDomainExtraction.html");
+  info(
+    "Load a sample SERP where domains need to be extracted in different ways."
+  );
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  for (let currentTest of TESTS) {
+    if (currentTest.title) {
+      info(currentTest.title);
+    }
+    let expectedDomains = new Set(currentTest.expectedDomains);
+    let actualDomains = await SpecialPowers.spawn(
+      gBrowser.selectedBrowser,
+      [currentTest.extractorInfos],
+      extractorInfos => {
+        const { domainExtractor } = ChromeUtils.importESModule(
+          "resource:///actors/SearchSERPTelemetryChild.sys.mjs"
+        );
+        return domainExtractor.extractDomainsFromDocument(
+          content.document,
+          extractorInfos
+        );
+      }
+    );
+
+    Assert.deepEqual(
+      Array.from(actualDomains),
+      Array.from(expectedDomains),
+      "Domains should have been extracted correctly."
+    );
+  }
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_region.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_region.js
new file mode 100644
index 0000000000..f328bb4f79
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_region.js
@@ -0,0 +1,120 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * These tests check that changing the region actually results in reporting the
+ * correct changes. Other tests that include region just report the default
+ * used by the test.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  Region: "resource://gre/modules/Region.sys.mjs",
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+});
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    // The search telemetry entry responsible for targeting the specific results.
+    domainExtraction: {
+      ads: [
+        {
+          selectors: "[data-ad-domain]",
+          method: "data-attribute",
+          options: {
+            dataAttributeKey: "adDomain",
+          },
+        },
+        {
+          selectors: ".ad",
+          method: "href",
+          options: {
+            queryParamKey: "ad_domain",
+          },
+        },
+      ],
+      nonAds: [
+        {
+          selectors: "#results .organic a",
+          method: "href",
+        },
+      ],
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+const originalHomeRegion = Region.home;
+const originalCurrentRegion = Region.current;
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+
+  let promise = waitForDomainToCategoriesUpdate();
+  await insertRecordIntoCollectionAndSync();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await promise;
+
+  info("Change region to DE.");
+  Region._setHomeRegion("DE", false);
+  Assert.equal(Region.home, "DE", "Region");
+
+  registerCleanupFunction(async () => {
+    Region._setHomeRegion(originalHomeRegion);
+    Region._setCurrentRegion(originalCurrentRegion);
+
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_categorize_page_with_different_region() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  await BrowserTestUtils.removeTab(tab);
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: "DE",
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting.js
new file mode 100644
index 0000000000..b7edb8763f
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting.js
@@ -0,0 +1,225 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * This test ensures we are correctly reporting categorized domains from a SERP.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  CATEGORIZATION_SETTINGS: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+});
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [
+      /^https:\/\/example\.com\/ad/,
+      /^https:\/\/www\.test(1[3456789]|2[01234])\.com/,
+    ],
+    // The search telemetry entry responsible for targeting the specific results.
+    domainExtraction: {
+      ads: [
+        {
+          selectors: "[data-ad-domain]",
+          method: "data-attribute",
+          options: {
+            dataAttributeKey: "adDomain",
+          },
+        },
+        {
+          selectors: ".ad",
+          method: "href",
+          options: {
+            queryParamKey: "ad_domain",
+          },
+        },
+      ],
+      nonAds: [
+        {
+          selectors: "#results .organic a",
+          method: "href",
+        },
+      ],
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+const client = RemoteSettings(TELEMETRY_CATEGORIZATION_KEY);
+const db = client.db;
+
+let categorizationRecord;
+let categorizationAttachment;
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+
+  let { record, attachment } = await insertRecordIntoCollection();
+  categorizationRecord = record;
+  categorizationAttachment = attachment;
+
+  let promise = waitForDomainToCategoriesUpdate();
+  await syncCollection(record);
+  // Enable the preference since all tests rely on it to be turned on.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await promise;
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+    await db.clear();
+  });
+});
+
+add_task(async function test_categorization_reporting() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a sample SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  await BrowserTestUtils.removeTab(tab);
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+});
+
+add_task(async function test_no_reporting_if_download_failure() {
+  resetTelemetry();
+
+  // Delete the attachment associated with the record so that syncing
+  // will cause an error.
+  await client.attachments.cacheImpl.delete(categorizationRecord.id);
+
+  let observeDownloadError = TestUtils.consoleMessageObserved(msg => {
+    return (
+      typeof msg.wrappedJSObject.arguments?.[0] == "string" &&
+      msg.wrappedJSObject.arguments[0].includes("Could not download file:")
+    );
+  });
+  // Since the preference is already enabled, and the map is filled we trigger
+  // the map to be updated via an RS sync. The download failure should cause the
+  // map to remain empty.
+  await syncCollection(categorizationRecord);
+  await observeDownloadError;
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a sample SERP with organic results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  await BrowserTestUtils.removeTab(tab);
+  assertCategorizationValues([]);
+
+  // Re-insert the attachment for other tests.
+  await client.attachments.cacheImpl.set(
+    categorizationRecord.id,
+    categorizationAttachment
+  );
+});
+
+add_task(async function test_no_reporting_if_no_records() {
+  resetTelemetry();
+
+  let observeNoRecords = TestUtils.consoleMessageObserved(msg => {
+    return (
+      typeof msg.wrappedJSObject.arguments?.[0] == "string" &&
+      msg.wrappedJSObject.arguments[0].includes(
+        "No records found for domain-to-categories map."
+      )
+    );
+  });
+  await syncCollection();
+  await observeNoRecords;
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a sample SERP with organic results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  await BrowserTestUtils.removeTab(tab);
+  assertCategorizationValues([]);
+});
+
+// Per a request from Data Science, we need to limit the number of domains
+// categorized to 10 non ad domains and 10 ad domains.
+add_task(async function test_reporting_limited_to_10_domains_of_each_kind() {
+  resetTelemetry();
+
+  await insertRecordIntoCollectionAndSync();
+
+  let url = getSERPUrl(
+    "searchTelemetryDomainCategorizationCapProcessedDomains.html"
+  );
+  info(
+    "Load a sample SERP with more than 10 organic results and more than 10 sponsored results."
+  );
+  let domainsCategorizedPromise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await domainsCategorizedPromise;
+
+  await BrowserTestUtils.removeTab(tab);
+
+  assertCategorizationValues([
+    {
+      organic_category: "0",
+      organic_num_domains:
+        CATEGORIZATION_SETTINGS.MAX_DOMAINS_TO_CATEGORIZE.toString(),
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "10",
+      sponsored_category: "2",
+      sponsored_num_domains:
+        CATEGORIZATION_SETTINGS.MAX_DOMAINS_TO_CATEGORIZE.toString(),
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "8",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "12",
+    },
+  ]);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting_timer.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting_timer.js
new file mode 100644
index 0000000000..cfb8590960
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting_timer.js
@@ -0,0 +1,287 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * These tests check that we report the categorization if the SERP is loaded,
+ * and the user idles. The tests also check that if we report the
+ * categorization and trigger another event that could cause a reporting, we
+ * don't cause more than one categorization to be reported.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  SearchSERPCategorizationEventScheduler:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+});
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    // The search telemetry entry responsible for targeting the specific results.
+    domainExtraction: {
+      ads: [
+        {
+          selectors: "[data-ad-domain]",
+          method: "data-attribute",
+          options: {
+            dataAttributeKey: "adDomain",
+          },
+        },
+        {
+          selectors: ".ad",
+          method: "href",
+          options: {
+            queryParamKey: "ad_domain",
+          },
+        },
+      ],
+      nonAds: [
+        {
+          selectors: "#results .organic a",
+          method: "href",
+        },
+      ],
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchTestUtils.useMockIdleService();
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+
+  // On startup, the event scheduler is initialized.
+  // If serpEventTelemetryCategorization is already true, the instance of the
+  // class will be subscribed to to the real idle service instead of the mock
+  // idle service. If it's false, toggling the preference (which happens later
+  // in this setup) will initialize it.
+  if (
+    Services.prefs.getBoolPref(
+      "browser.search.serpEventTelemetryCategorization.enabled"
+    )
+  ) {
+    SearchSERPCategorizationEventScheduler.uninit();
+    SearchSERPCategorizationEventScheduler.init();
+  }
+  await waitForIdle();
+
+  let promise = waitForDomainToCategoriesUpdate();
+  await insertRecordIntoCollectionAndSync();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await promise;
+
+  registerCleanupFunction(async () => {
+    // The scheduler uses the mock idle service.
+    SearchSERPCategorizationEventScheduler.uninit();
+    SearchSERPCategorizationEventScheduler.init();
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_categorize_serp_and_wait() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  assertCategorizationValues([]);
+
+  promise = waitForAllCategorizedEvents();
+  SearchTestUtils.idleService._fireObservers("idle");
+  await promise;
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+
+  info("Ensure we don't record a duplicate of this event.");
+  resetTelemetry();
+  SearchTestUtils.idleService._fireObservers("idle");
+  SearchTestUtils.idleService._fireObservers("active");
+  await BrowserTestUtils.removeTab(tab);
+
+  assertCategorizationValues([]);
+});
+
+add_task(async function test_categorize_serp_open_multiple_tabs() {
+  resetTelemetry();
+
+  let tabs = [];
+  let expectedResults = [];
+  for (let i = 0; i < 5; ++i) {
+    let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+    info("Load a SERP with organic and sponsored results.");
+    let promise = waitForPageWithCategorizedDomains();
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+    await promise;
+    tabs.push(tab);
+    // Pushing expected results into a single array to avoid having a massive,
+    // unreadable array.
+    expectedResults.push({
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    });
+  }
+
+  info("Simulate idle event and wait for results.");
+  let promise = waitForAllCategorizedEvents();
+  SearchTestUtils.idleService._fireObservers("idle");
+  await promise;
+  assertCategorizationValues(expectedResults);
+
+  info("Ensure we don't record a duplicate of any event.");
+  resetTelemetry();
+  for (let tab of tabs) {
+    await BrowserTestUtils.removeTab(tab);
+  }
+  assertCategorizationValues([]);
+});
+
+// Ensures we don't double record a categorization event if the closed the tab
+// before an idle event.
+add_task(async function test_categorize_serp_close_tab_and_wait() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  assertCategorizationValues([]);
+
+  promise = waitForSingleCategorizedEvent();
+  await BrowserTestUtils.removeTab(tab);
+  await promise;
+
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+
+  info("Ensure we don't record a duplicate of this event.");
+  resetTelemetry();
+  SearchTestUtils.idleService._fireObservers("idle");
+  assertCategorizationValues([]);
+});
+
+add_task(async function test_categorize_serp_open_ad_and_wait() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  info("Open ad in new tab.");
+  let promiseTabOpened = BrowserTestUtils.waitForNewTab(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    ".ad",
+    { button: 1 },
+    tab.linkedBrowser
+  );
+  let tab2 = await promiseTabOpened;
+
+  assertCategorizationValues([]);
+
+  promise = waitForAllCategorizedEvents();
+  SearchTestUtils.idleService._fireObservers("idle");
+  info("Waiting for categorized events.");
+  await promise;
+
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "1",
+      num_ads_visible: "2",
+    },
+  ]);
+
+  // Clean up.
+  await BrowserTestUtils.removeTab(tab);
+  await BrowserTestUtils.removeTab(tab2);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting_timer_wakeup.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting_timer_wakeup.js
new file mode 100644
index 0000000000..cb95164221
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_domain_categorization_reporting_timer_wakeup.js
@@ -0,0 +1,202 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * These tests check that we report the SERP categorization upon waking a
+ * computer and enough time has passed.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  CATEGORIZATION_SETTINGS: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPCategorizationEventScheduler:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  TELEMETRY_CATEGORIZATION_KEY:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+});
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    // The search telemetry entry responsible for targeting the specific results.
+    domainExtraction: {
+      ads: [
+        {
+          selectors: "[data-ad-domain]",
+          method: "data-attribute",
+          options: {
+            dataAttributeKey: "adDomain",
+          },
+        },
+        {
+          selectors: ".ad",
+          method: "href",
+          options: {
+            queryParamKey: "ad_domain",
+          },
+        },
+      ],
+      nonAds: [
+        {
+          selectors: "#results .organic a",
+          method: "href",
+        },
+      ],
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  let oldWakeTimeout = CATEGORIZATION_SETTINGS.WAKE_TIMEOUT_MS;
+
+  // Use a sane timeout.
+  CATEGORIZATION_SETTINGS.WAKE_TIMEOUT_MS = 100;
+
+  SearchTestUtils.useMockIdleService();
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  // On startup, the event scheduler is initialized.
+  // If serpEventTelemetryCategorization is already true, the instance of the
+  // class will be subscribed to to the real idle service instead of the mock
+  // idle service. If it's false, toggling the preference (which happens later
+  // in this setup) will initialize it.
+  if (
+    Services.prefs.getBoolPref(
+      "browser.search.serpEventTelemetryCategorization.enabled"
+    )
+  ) {
+    SearchSERPCategorizationEventScheduler.uninit();
+    SearchSERPCategorizationEventScheduler.init();
+  }
+  await waitForIdle();
+
+  let promise = waitForDomainToCategoriesUpdate();
+  await insertRecordIntoCollectionAndSync();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetryCategorization.enabled", true]],
+  });
+  await promise;
+
+  registerCleanupFunction(async () => {
+    // The scheduler uses the mock idle service.
+    SearchSERPCategorizationEventScheduler.uninit();
+    SearchSERPCategorizationEventScheduler.init();
+    CATEGORIZATION_SETTINGS.WAKE_TIMEOUT_MS = oldWakeTimeout;
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_categorize_serp_and_sleep() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  assertCategorizationValues([]);
+
+  info("Wait enough between the categorization and the sleep timeout.");
+  /* eslint-disable mozilla/no-arbitrary-setTimeout */
+  await new Promise(resolve => setTimeout(resolve, 200));
+
+  info("Simulate a wake notification.");
+  promise = waitForAllCategorizedEvents();
+  SearchTestUtils.idleService._fireObservers("wake_notification");
+  await promise;
+
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+
+  info("Ensure we don't record a duplicate of this event.");
+  resetTelemetry();
+  SearchTestUtils.idleService._fireObservers("idle");
+  SearchTestUtils.idleService._fireObservers("active");
+  SearchTestUtils.idleService._fireObservers("wake_notification");
+  await BrowserTestUtils.removeTab(tab);
+
+  assertCategorizationValues([]);
+});
+
+add_task(async function test_categorize_serp_and_sleep_not_long_enough() {
+  resetTelemetry();
+
+  // Use a really long timeout.
+  CATEGORIZATION_SETTINGS.WAKE_TIMEOUT_MS = 500_000;
+
+  let url = getSERPUrl("searchTelemetryDomainCategorizationReporting.html");
+  info("Load a SERP with organic and sponsored results.");
+  let promise = waitForPageWithCategorizedDomains();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await promise;
+
+  assertCategorizationValues([]);
+
+  info("Wait as long as the previous test.");
+  /* eslint-disable mozilla/no-arbitrary-setTimeout */
+  await new Promise(resolve => setTimeout(resolve, 200));
+  assertCategorizationValues([]);
+
+  info("Simulate a wake notification.");
+  SearchTestUtils.idleService._fireObservers("wake_notification");
+  assertCategorizationValues([]);
+
+  // Closing the tab should record the telemetry.
+  await BrowserTestUtils.removeTab(tab);
+  assertCategorizationValues([
+    {
+      organic_category: "3",
+      organic_num_domains: "1",
+      organic_num_inconclusive: "0",
+      organic_num_unknown: "0",
+      sponsored_category: "4",
+      sponsored_num_domains: "2",
+      sponsored_num_inconclusive: "0",
+      sponsored_num_unknown: "0",
+      mappings_version: "1",
+      app_version: APP_MAJOR_VERSION,
+      channel: CHANNEL,
+      region: REGION,
+      partner_code: "ff",
+      provider: "example",
+      tagged: "true",
+      num_ads_clicked: "0",
+      num_ads_visible: "2",
+    },
+  ]);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_cached.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_cached.js
new file mode 100644
index 0000000000..791e29a01f
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_cached.js
@@ -0,0 +1,201 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests load SERPs and click on cacheable links.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+        included: {
+          parent: {
+            selector: ".moz-carousel",
+          },
+          children: [
+            {
+              selector: ".moz-carousel-card",
+              countChildren: true,
+            },
+          ],
+          related: {
+            selector: "button",
+          },
+        },
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        included: {
+          parent: {
+            selector: ".moz_ad",
+          },
+          children: [
+            {
+              selector: ".multi-col",
+              type: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+            },
+          ],
+          related: {
+            selector: "button",
+          },
+        },
+        excluded: {
+          parent: {
+            selector: ".rhs",
+          },
+        },
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        included: {
+          parent: {
+            selector: "form",
+          },
+          children: [
+            {
+              selector: "input",
+            },
+          ],
+          related: {
+            selector: "div",
+          },
+        },
+        topDown: true,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_click_cached_page() {
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let cacheableUrl =
+    "https://example.com/browser/browser/components/search/test/browser/telemetry/cacheable.html";
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(
+    gBrowser,
+    cacheableUrl
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#non_ads_link",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  gBrowser.goBack();
+  await waitForPageWithAdImpressions();
+
+  pageLoadPromise = BrowserTestUtils.waitForLocationChange(
+    gBrowser,
+    cacheableUrl
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#non_ads_link",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "5",
+          ads_visible: "5",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "5",
+          ads_visible: "5",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_cached_serp.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_cached_serp.js
new file mode 100644
index 0000000000..72e26639fb
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_cached_serp.js
@@ -0,0 +1,218 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests check when a SERP retrieves data from the BFCache as SERPs
+ * typically set their response headers with Cache-Control as private.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [/^https:\/\/example.com/],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        included: {
+          parent: {
+            selector: "form",
+          },
+          children: [
+            {
+              selector: "input",
+            },
+          ],
+          related: {
+            selector: "div",
+          },
+        },
+        topDown: true,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+async function goBack(tab, callback = async () => {}) {
+  info("Go back.");
+  let pageShowPromise = BrowserTestUtils.waitForContentEvent(
+    tab.linkedBrowser,
+    "pageshow"
+  );
+  tab.linkedBrowser.goBack();
+  await pageShowPromise;
+  await callback();
+}
+
+async function goForward(tab, callback = async () => {}) {
+  info("Go forward.");
+  let pageShowPromise = BrowserTestUtils.waitForContentEvent(
+    tab.linkedBrowser,
+    "pageshow"
+  );
+  tab.linkedBrowser.goForward();
+  await pageShowPromise;
+  await callback();
+}
+
+// This test loads a cached SERP and checks returning to it and interacting
+// with elements on the page don't count the events more than once.
+// This is a proxy for ensuring we remove event listeners.
+add_task(async function test_cached_serp() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox.html");
+  info("Load search page.");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  for (let index = 0; index < 3; ++index) {
+    info("Load non-search page.");
+    let loadPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser, true);
+    BrowserTestUtils.startLoadingURIString(
+      tab.linkedBrowser,
+      "https://www.example.com"
+    );
+    await loadPromise;
+    await goBack(tab, async () => {
+      await waitForPageWithAdImpressions();
+    });
+  }
+
+  info("Click on searchbox.");
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "input",
+    {},
+    tab.linkedBrowser
+  );
+
+  await Services.fog.testFlushAllChildren();
+  let engagements = Glean.serp.engagement.testGetValue() ?? [];
+  Assert.equal(
+    engagements.length,
+    1,
+    "There should be 1 engagement event recorded."
+  );
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_back_and_forward_serp_to_serp() {
+  await SpecialPowers.pushPrefEnv({
+    // This has to be disabled or else using back and forward in the test won't
+    // trigger responses in the network listener in SearchSERPTelemetry. The
+    // page will still load from a BFCache.
+    set: [["fission.bfcacheInParent", false]],
+  });
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_searchbox.html");
+  info("Load search page.");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let loadPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser, false);
+  info("Click on a suggested search term.");
+  BrowserTestUtils.synthesizeMouseAtCenter("#suggest", {}, tab.linkedBrowser);
+  await loadPromise;
+  await waitForPageWithAdImpressions();
+
+  for (let index = 0; index < 3; ++index) {
+    info("Return to first search page.");
+    await goBack(tab, async () => {
+      await waitForPageWithAdImpressions();
+    });
+    info("Return to second search page.");
+    await goForward(tab, async () => {
+      await waitForPageWithAdImpressions();
+    });
+  }
+
+  await Services.fog.testFlushAllChildren();
+  let engagements = Glean.serp.engagement.testGetValue() ?? [];
+  let abandonments = Glean.serp.abandonment.testGetValue() ?? [];
+  Assert.equal(engagements.length, 1, "There should be 1 engagement.");
+  Assert.equal(abandonments.length, 6, "There should be 6 abandonments.");
+
+  BrowserTestUtils.removeTab(tab);
+  await SpecialPowers.popPrefEnv();
+});
+
+add_task(async function test_back_and_forward_content_to_serp_to_serp() {
+  await SpecialPowers.pushPrefEnv({
+    // This has to be disabled or else using back and forward in the test won't
+    // trigger responses in the network listener in SearchSERPTelemetry. The
+    // page will still load from a BFCache.
+    set: [["fission.bfcacheInParent", false]],
+  });
+  resetTelemetry();
+
+  info("Load non-search page.");
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "https://www.example.com/"
+  );
+
+  info("Load search page.");
+  let url = getSERPUrl("searchTelemetryAd_searchbox.html");
+  let loadPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser, true);
+  BrowserTestUtils.startLoadingURIString(tab.linkedBrowser, url);
+  await loadPromise;
+  await waitForPageWithAdImpressions();
+
+  loadPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser, false);
+  info("Click on a suggested search term.");
+  BrowserTestUtils.synthesizeMouseAtCenter("#suggest", {}, tab.linkedBrowser);
+  await loadPromise;
+  await waitForPageWithAdImpressions();
+
+  info("Return to first search page.");
+  await goBack(tab, async () => {
+    await waitForPageWithAdImpressions();
+  });
+
+  info("Return to non-search page.");
+  await goBack(tab);
+
+  info("Return to first search page.");
+  await goForward(tab, async () => {
+    await waitForPageWithAdImpressions();
+  });
+
+  info("Return to second search page.");
+  await goForward(tab, async () => {
+    await waitForPageWithAdImpressions();
+  });
+
+  await Services.fog.testFlushAllChildren();
+  let engagements = Glean.serp.engagement.testGetValue() ?? [];
+  let abandonments = Glean.serp.abandonment.testGetValue() ?? [];
+  Assert.equal(engagements.length, 1, "There should be 1 engagement.");
+  Assert.equal(abandonments.length, 3, "There should be 3 abandonments.");
+
+  BrowserTestUtils.removeTab(tab);
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_content.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_content.js
new file mode 100644
index 0000000000..a7ea62ebd5
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_content.js
@@ -0,0 +1,633 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests load a SERP that has multiple ways of refining a search term
+ * within content, or moving it into another search engine. It is also common
+ * for providers to remove tracking params.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_searchbox_with_content.html/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_searchbox_with_content_redirect.html/,
+    ],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    shoppingTab: {
+      selector: "nav a",
+      regexp: "&page=shopping",
+      inspectRegexpInSERP: true,
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        included: {
+          parent: {
+            selector: "form",
+          },
+          children: [
+            {
+              selector: "input",
+            },
+          ],
+          related: {
+            selector: "div",
+          },
+        },
+        topDown: true,
+        nonAd: true,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+        included: {
+          parent: {
+            selector: ".refined-search-buttons",
+          },
+          children: [
+            {
+              selector: "a",
+            },
+          ],
+        },
+        topDown: true,
+        nonAd: true,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+// "Tabs" are considered to be links the navigation of a SERP. Their hrefs
+// may look similar to a search page, including related searches.
+add_task(async function test_click_tab() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#images",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Ensure that shopping links on a page with many non-ad link regular
+// expressions doesn't get confused for a non-ads link.
+add_task(async function test_click_shopping() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#shopping",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "unknown",
+        is_shopping_page: "true",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_click_related_search_in_new_tab() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + "searchTelemetryAd_searchbox_with_content.html?s=test+one+two+three";
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, targetUrl, true);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#related-new-tab",
+    {},
+    tab.linkedBrowser
+  );
+  let tab2 = await tabPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "opened_in_new_tab",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+  BrowserTestUtils.removeTab(tab2);
+});
+
+// We consider regular expressions in nonAdsLinkRegexps and searchPageRegexp
+// as valid non ads links when recording an engagement event.
+add_task(async function test_click_redirect_search_in_newtab() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + "searchTelemetryAd_searchbox_with_content.html?s=test+one+two+three";
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, targetUrl, true);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#related-redirect",
+    {},
+    tab.linkedBrowser
+  );
+  let tab2 = await tabPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "opened_in_new_tab",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+  BrowserTestUtils.removeTab(tab2);
+});
+
+// Ensure if a user does a search that uses one of the in-content sources,
+// we clear the cached source value.
+add_task(async function test_content_source_reset() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  // Do a text search to trigger a defined target.
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "form input",
+    {},
+    tab.linkedBrowser
+  );
+  EventUtils.synthesizeKey("KEY_Enter");
+  await pageLoadPromise;
+
+  // Click on a related search that will load within the same page and should
+  // have an unknown target.
+  await waitForPageWithAdImpressions();
+  pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#related-in-page",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.SUBMITTED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "follow_on_from_refine_on_incontent_search",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// This test also deliberately includes an anchor with a reserved character in
+// the href that gets parsed on page load. This is because when the URL is
+// requested and observed in the network process, it is converted into a
+// percent encoded string, so we want to ensure we're categorizing the
+// component properly. This can happen with refinement buttons.
+add_task(async function test_click_refinement_button() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + "searchTelemetryAd_searchbox_with_content.html?s=test%27s";
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(
+    gBrowser,
+    targetUrl
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#refined-search-button",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "follow_on_from_refine_on_SERP",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_multiple_tabs.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_multiple_tabs.js
new file mode 100644
index 0000000000..fbe6f4fc73
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_multiple_tabs.js
@@ -0,0 +1,206 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * This test ensures that recorded telemetry is consistent even with multiple
+ * tabs opened and closed.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_nonAdsLink_redirect/,
+    ],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        included: {
+          parent: {
+            selector: "form",
+          },
+          children: [
+            {
+              // This isn't contained in any of the HTML examples but the
+              // presence of the entry ensures that if it is not found during
+              // a topDown examination, the next element in the array is
+              // inspected and found.
+              selector: "textarea",
+            },
+            {
+              selector: "input",
+            },
+          ],
+          related: {
+            selector: "div",
+          },
+        },
+        topDown: true,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+// Deliberately make the web isolated process count as small as possible
+// so that we don't have to create a ton of tabs to reuse a process.
+const MAX_IPC = 1;
+const TABS_TO_OPEN = 2;
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.serpEventTelemetry.enabled", true],
+      ["dom.ipc.processCount.webIsolated", MAX_IPC],
+    ],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+async function do_test(tab, impressionId, switchTab) {
+  if (switchTab) {
+    await BrowserTestUtils.switchTab(gBrowser, tab);
+  }
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "input",
+    {},
+    tab.linkedBrowser
+  );
+
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#images",
+    {},
+    tab.linkedBrowser
+  );
+
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser, true);
+
+  await Services.fog.testFlushAllChildren();
+  let engagements = Glean.serp.engagement.testGetValue() ?? [];
+  Assert.equal(engagements.length, 2, "Should have two events recorded.");
+
+  Assert.deepEqual(
+    engagements[0].extra,
+    {
+      action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+      target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+      impression_id: impressionId,
+    },
+    "Search box engagement event should match."
+  );
+  Assert.deepEqual(
+    engagements[1].extra,
+    {
+      action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+      target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+      impression_id: impressionId,
+    },
+    "Non ads page engagement event should match."
+  );
+  resetTelemetry();
+}
+
+// This test deliberately opens a lot of tabs to ensure SERPs share the
+// same process. It interacts with the page to ensure the engagement
+// has the correct recording, especially the impression id which can be out of
+// sync if data in the child process isn't cached properly.
+add_task(async function test_multiple_tabs_forward() {
+  resetTelemetry();
+
+  let tabs = [];
+  let pid;
+
+  // Open multiple tabs.
+  for (let index = 0; index < TABS_TO_OPEN; ++index) {
+    let url = getSERPUrl(
+      "searchTelemetryAd_searchbox_with_content.html",
+      `hello+world+${index}`
+    );
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+    await waitForPageWithAdImpressions();
+    tabs.push(tab);
+    let currentPid = E10SUtils.getBrowserPids(tab.linkedBrowser).at(0);
+    if (pid == null) {
+      pid = currentPid;
+    } else {
+      Assert.ok(pid == currentPid, "The process ID should be the same.");
+    }
+  }
+
+  // Extract the impression IDs.
+  await Services.fog.testFlushAllChildren();
+  let recordedImpressions = Glean.serp.impression.testGetValue() ?? [];
+  let impressionIds = recordedImpressions.map(
+    impression => impression.extra.impression_id
+  );
+
+  // Reset telemetry because we're not concerned about inspecting every
+  // impression event.
+  resetTelemetry();
+
+  for (let index = 0; index < TABS_TO_OPEN; ++index) {
+    let tab = tabs[index];
+    let impressionId = impressionIds[index];
+    await do_test(tab, impressionId, true);
+    BrowserTestUtils.removeTab(tab);
+  }
+});
+
+add_task(async function test_multiple_tabs_backward() {
+  resetTelemetry();
+
+  let tabs = [];
+  let pid;
+
+  for (let index = 0; index < TABS_TO_OPEN; ++index) {
+    let url = getSERPUrl(
+      "searchTelemetryAd_searchbox_with_content.html",
+      `hello+world+${index}`
+    );
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+    await waitForPageWithAdImpressions();
+    tabs.push(tab);
+    let currentPid = E10SUtils.getBrowserPids(tab.linkedBrowser).at(0);
+    if (pid == null) {
+      pid = currentPid;
+    } else {
+      Assert.ok(pid == currentPid, "The process ID should be the same.");
+    }
+  }
+
+  // Extract the impression IDs.
+  await Services.fog.testFlushAllChildren();
+  let recordedImpressions = Glean.serp.impression.testGetValue() ?? [];
+  let impressionIds = recordedImpressions.map(
+    impression => impression.extra.impression_id
+  );
+
+  // Reset telemetry because we're not concerned about inspecting every
+  // impression event.
+  resetTelemetry();
+
+  for (let index = TABS_TO_OPEN - 1; index >= 0; --index) {
+    let tab = tabs[index];
+    let impressionId = impressionIds[index];
+    await do_test(tab, impressionId, false);
+    BrowserTestUtils.removeTab(tab);
+  }
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_non_ad.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_non_ad.js
new file mode 100644
index 0000000000..d351234d50
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_non_ad.js
@@ -0,0 +1,146 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests load SERPs and click on links that are non ads. Non ads can have
+ * slightly different behavior from ads.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+// If an anchor is a non_ads_link and it doesn't match a non-ads regular
+// expression, it should still be categorize it as a non ad.
+add_task(async function test_click_non_ads_link() {
+  await waitForIdle();
+
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  // Click a non ad.
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#non_ads_link",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "13",
+          ads_visible: "13",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+
+  // Reset state for other tests.
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+});
+
+// Click on an non-ad element while no ads are present.
+add_task(async function test_click_non_ad_with_no_ads() {
+  await waitForIdle();
+
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_searchbox.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    true,
+    "https://example.com/hello_world"
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#non_ads_link",
+    {},
+    tab.linkedBrowser
+  );
+  await browserLoadedPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+
+  // Reset state for other tests.
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_query_params.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_query_params.js
new file mode 100644
index 0000000000..6d93707d68
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_query_params.js
@@ -0,0 +1,387 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests load SERPs and check that query params that are changed either
+ * by the browser or in the page after click are still properly recognized
+ * as ads.
+ *
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        included: {
+          parent: {
+            selector: ".moz_ad",
+          },
+          children: [
+            {
+              selector: ".multi-col",
+              type: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+            },
+          ],
+        },
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+// Baseline test clicking on either link properly categorizes both properly.
+add_task(async function test_click_links() {
+  let url = getSERPUrl("searchTelemetryAd_components_query_parameters.html");
+
+  info("Load SERP.");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  info("Click on ad link.");
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#ad_link",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  info("Load SERP again.");
+  BrowserTestUtils.startLoadingURIString(gBrowser, url);
+  pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await waitForPageWithAdImpressions();
+
+  info("Click on site link.");
+  pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#ad_sitelink",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Clean up.
+  BrowserTestUtils.removeTab(tab);
+  resetTelemetry();
+});
+
+add_task(async function test_click_link_with_more_parameters() {
+  let url = getSERPUrl("searchTelemetryAd_components_query_parameters.html");
+
+  info("Load SERP.");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  info("After ad impressions, add query parameters to DOM element.");
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let el = content.document.getElementById("ad_sitelink");
+    let domUrl = new URL(el.href);
+    domUrl.searchParams.set("example", "param");
+    el.setAttribute("href", domUrl.toString());
+  });
+
+  info("Click on site link.");
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#ad_sitelink",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Clean up.
+  BrowserTestUtils.removeTab(tab);
+  resetTelemetry();
+});
+
+add_task(async function test_click_link_with_fewer_parameters() {
+  let url = getSERPUrl("searchTelemetryAd_components_query_parameters.html");
+
+  info("Load SERP.");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  info("After ad impressions, remove a query parameter from a DOM element.");
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let el = content.document.getElementById("ad_sitelink");
+    let domUrl = new URL(el.href);
+    domUrl.searchParams.delete("foo");
+    el.setAttribute("href", domUrl.toString());
+  });
+
+  info("Click on site link.");
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#ad_sitelink",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Clean up.
+  BrowserTestUtils.removeTab(tab);
+  resetTelemetry();
+});
+
+add_task(async function test_click_link_with_reordered_parameters() {
+  let url = getSERPUrl("searchTelemetryAd_components_query_parameters.html");
+
+  info("Load SERP.");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  info("After ad impressions, re-sort the query params.");
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    let el = content.document.getElementById("ad_sitelink");
+    let domUrl = new URL(el.href);
+    domUrl.searchParams.sort();
+    el.setAttribute("href", domUrl.toString());
+  });
+
+  info("Click on site link.");
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#ad_sitelink",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Clean up.
+  BrowserTestUtils.removeTab(tab);
+  resetTelemetry();
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_redirect.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_redirect.js
new file mode 100644
index 0000000000..5d7f2ee408
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_redirect.js
@@ -0,0 +1,372 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests load SERPs and click on both ad and non-ad links that can be
+ * redirected.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_nonAdsLink_redirect.html/,
+    ],
+    extraAdServersRegexps: [
+      /^https:\/\/example\.com\/ad/,
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/redirect_ad/,
+    ],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_click_non_ads_link_redirected() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl = "https://example.com/hello_world";
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    true,
+    targetUrl
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#non_ads_link_redirected",
+    {},
+    tab.linkedBrowser
+  );
+
+  await browserLoadedPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "14",
+          ads_visible: "14",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// If a provider does a re-direct and we open it in a new tab, we should
+// record the click and have the correct number of engagements.
+add_task(async function test_click_non_ads_link_redirected_new_tab() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let redirectUrl =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + "searchTelemetryAd_nonAdsLink_redirect.html";
+  let targetUrl = "https://example.com/hello_world";
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, targetUrl, true);
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [redirectUrl], urls => {
+    content.document
+      .getElementById(["non_ads_link"])
+      .addEventListener("click", e => {
+        e.preventDefault();
+        content.window.open([urls], "_blank");
+      });
+    content.document.getElementById("non_ads_link").click();
+  });
+  let tab2 = await tabPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "14",
+          ads_visible: "14",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+  BrowserTestUtils.removeTab(tab2);
+});
+
+// Some providers load a URL of a non ad within a subframe before loading the
+// target website in the top level frame.
+add_task(async function test_click_non_ads_link_redirect_non_top_level() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl = "https://example.com/hello_world";
+
+  let browserPromise = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    true,
+    targetUrl
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#non_ads_link_redirected_no_top_level",
+    {},
+    tab.linkedBrowser
+  );
+
+  await browserPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "14",
+          ads_visible: "14",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_multiple_redirects_non_ad_link() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl = "https://example.com/hello_world";
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    true,
+    targetUrl
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#non_ads_link_multiple_redirects",
+    {},
+    tab.linkedBrowser
+  );
+
+  await browserLoadedPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "14",
+          ads_visible: "14",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_click_ad_link_redirected() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl = "https://example.com/hello_world";
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    true,
+    targetUrl
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#ad_link_redirect",
+    {},
+    tab.linkedBrowser
+  );
+
+  await browserLoadedPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "14",
+          ads_visible: "14",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_click_ad_link_redirected_new_tab() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl = "https://example.com/hello_world";
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, targetUrl, true);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#ad_link_redirect",
+    { button: 1 },
+    tab.linkedBrowser
+  );
+  let tab2 = await tabPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "14",
+          ads_visible: "14",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+  BrowserTestUtils.removeTab(tab2);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_target.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_target.js
new file mode 100644
index 0000000000..b30a7bc0c1
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_engagement_target.js
@@ -0,0 +1,457 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests load SERPs and click on links that can either be ads or non ads
+ * and verifies that the engagement events and the target associated with them
+ * are correct.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_nonAdsLink_redirect.html/,
+    ],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+        included: {
+          parent: {
+            selector: ".moz-carousel",
+          },
+          children: [
+            {
+              selector: ".moz-carousel-card",
+              countChildren: true,
+            },
+          ],
+          related: {
+            selector: "button",
+          },
+        },
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        included: {
+          parent: {
+            selector: ".moz_ad",
+          },
+          children: [
+            {
+              selector: ".multi-col",
+              type: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+            },
+          ],
+          related: {
+            selector: "button",
+          },
+        },
+        excluded: {
+          parent: {
+            selector: ".rhs",
+          },
+        },
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        included: {
+          parent: {
+            selector: "form",
+          },
+          children: [
+            {
+              // This isn't contained in any of the HTML examples but the
+              // presence of the entry ensures that if it is not found during
+              // a topDown examination, the next element in the array is
+              // inspected and found.
+              selector: "textarea",
+            },
+            {
+              selector: "input",
+            },
+          ],
+          related: {
+            selector: "div",
+          },
+        },
+        topDown: true,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+// This is used to check if not providing an nonAdsLinkRegexp can still
+// reliably categorize non_ads_links.
+const TEST_PROVIDER_INFO_NO_NON_ADS_REGEXP = [
+  {
+    ...TEST_PROVIDER_INFO[0],
+    nonAdsLinkRegexps: [],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+// This test ensures clicking a non-first link in a component registers the
+// proper component. This is because the first link of a component does the
+// heavy lifting in finding the parent and best categorization of the
+// component. Subsequent anchors that have the same parent get grouped into it.
+// Additionally, this test deliberately has ads with different paths so that
+// there are no collisions in hrefs.
+add_task(async function test_click_second_ad_in_component() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#deep_ad_sitelink",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "5",
+          ads_visible: "5",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// If a provider appends query parameters to a link after the page has been
+// parsed, we should still be able to record the click.
+add_task(async function test_click_ads_link_modified() {
+  resetTelemetry();
+
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
+    let target = content.document.getElementById("deep_ad_sitelink");
+    let href = target.getAttribute("href");
+    target.setAttribute("href", href + "?foo=bar");
+    content.document.getElementById("deep_ad_sitelink").click();
+  });
+  await browserLoadedPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "5",
+          ads_visible: "5",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Search box is a special case which has to be tracked in the child process.
+add_task(async function test_click_and_submit_incontent_searchbox() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  // Click on the searchbox.
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "form input",
+    {},
+    tab.linkedBrowser
+  );
+  EventUtils.synthesizeKey("KEY_Enter");
+  await pageLoadPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.SUBMITTED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "follow_on_from_refine_on_incontent_search",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Click an auto-suggested term. The element that is clicked is related
+// to the searchbox but not in search-telemetry-v2 because it can be too
+// difficult to determine ahead of time since the elements are generated
+// dynamically. So instead it should listen to an element higher in the DOM.
+add_task(async function test_click_autosuggest() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  // Click an autosuggested term.
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#suggest",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.SUBMITTED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "follow_on_from_refine_on_incontent_search",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Carousel related buttons expand content.
+add_task(async function test_click_carousel_expand() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_carousel.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  // Click a button that is expected to expand.
+  await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
+    content.document.querySelector("button").click();
+  });
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.EXPANDED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_CAROUSEL,
+          ads_loaded: "4",
+          ads_visible: "3",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// This test clicks a link that has apostrophes in the both the path and list
+// of query parameters, and uses search telemetry with no nonAdsRegexps defined,
+// which will force us to cache every non ads link in a map and pass it back to
+// the parent.
+// If this test fails, it means we're doing the conversion wrong, because when
+// we observe the clicked URL in the parent process, it should look exactly the
+// same as how it was saved in the hrefToComponent map.
+add_task(async function test_click_link_with_special_characters_in_path() {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(
+    TEST_PROVIDER_INFO_NO_NON_ADS_REGEXP
+  );
+  await waitForIdle();
+
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_components_text.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(
+    gBrowser,
+    "https://example.com/path'?hello_world&foo=bar%27s"
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#non_ads_link_with_special_characters_in_path",
+    {},
+    tab.linkedBrowser
+  );
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_SITELINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "5",
+          ads_visible: "5",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+
+  // Reset state for other tests.
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_new_window.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_new_window.js
new file mode 100644
index 0000000000..4f943fe92d
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_new_window.js
@@ -0,0 +1,350 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests load ads and organic links in new windows.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function load_serp_in_new_window_with_pref_and_click_ad() {
+  info("Set browser.link.open_newwindow to open _blank in new window.");
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.link.open_newwindow", 2]],
+  });
+
+  info("Load SERP in a new tab.");
+  let url = getSERPUrl("searchTelemetryAd.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  info("Wait for page impression.");
+  await waitForPageWithAdImpressions();
+
+  info("Open ad link in a new window.");
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    content.document.getElementById("ad1").setAttribute("target", "_blank");
+  });
+  let newWindowPromise = BrowserTestUtils.waitForNewWindow({
+    url: "https://example.com/ad",
+  });
+  await BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  let newWindow = await newWindowPromise;
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example:tagged": 1 },
+      "browser.search.adclicks.unknown": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Clean-up.
+  await SpecialPowers.popPrefEnv();
+  BrowserTestUtils.removeTab(tab);
+  await BrowserTestUtils.closeWindow(newWindow);
+  resetTelemetry();
+});
+
+add_task(async function load_serp_in_new_window_with_pref_and_click_organic() {
+  info("Set browser.link.open_newwindow to open _blank in new window.");
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.link.open_newwindow", 2]],
+  });
+
+  info("Load SERP in a new tab.");
+  let url = getSERPUrl("searchTelemetry.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  info("Wait for page impression.");
+  await waitForPageWithAdImpressions();
+
+  info("Open organic link in a new window.");
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    content.document.querySelector("a").setAttribute("target", "_blank");
+  });
+  let newWindowPromise = BrowserTestUtils.waitForNewWindow({
+    url: "https://example.com/otherpage",
+  });
+  await BrowserTestUtils.synthesizeMouseAtCenter("a", {}, tab.linkedBrowser);
+  let newWindow = await newWindowPromise;
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:tagged:ff": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [],
+    },
+  ]);
+
+  // Clean-up.
+  await SpecialPowers.popPrefEnv();
+  BrowserTestUtils.removeTab(tab);
+  await BrowserTestUtils.closeWindow(newWindow);
+  resetTelemetry();
+});
+
+add_task(async function load_serp_in_new_window_with_context_menu() {
+  info("Load SERP in a new tab.");
+  let url = getSERPUrl("searchTelemetryAd.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  info("Wait for page impression.");
+  await waitForPageWithAdImpressions();
+
+  info("Open context menu.");
+  let contextMenu = document.getElementById("contentAreaContextMenu");
+  let contextMenuPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popupshown"
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#ad1",
+    { type: "contextmenu", button: 2 },
+    tab.linkedBrowser
+  );
+  await contextMenuPromise;
+
+  info("Click on Open Link in New Window");
+  let newWindowPromise = BrowserTestUtils.waitForNewWindow({
+    url: "https://example.com/ad",
+  });
+  let openLinkInNewWindow = contextMenu.querySelector("#context-openlink");
+  contextMenu.activateItem(openLinkInNewWindow);
+  let newWindow = await newWindowPromise;
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example:tagged": 1 },
+      "browser.search.adclicks.unknown": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Clean-up.
+  BrowserTestUtils.removeTab(tab);
+  await BrowserTestUtils.closeWindow(newWindow);
+  resetTelemetry();
+});
+
+add_task(
+  async function load_multiple_serps_with_different_search_terms_and_click_ad() {
+    info("Set browser.link.open_newwindow to open _blank in new window.");
+    await SpecialPowers.pushPrefEnv({
+      set: [["browser.link.open_newwindow", 2]],
+    });
+
+    info("Load SERP in a new tab.");
+    let url = getSERPUrl("searchTelemetryAd.html");
+    let formattedUrl1 = new URL(url);
+    formattedUrl1.searchParams.set("s", "test1");
+    let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+    info("Wait for page impression.");
+    await waitForPageWithAdImpressions();
+
+    info("Load SERP in a new tab with a different search term.");
+    url = getSERPUrl("searchTelemetryAd.html");
+    let formattedUrl2 = new URL(url);
+    formattedUrl2.searchParams.set("s", "test2");
+    let tab2 = await BrowserTestUtils.openNewForegroundTab(
+      gBrowser,
+      formattedUrl2.href
+    );
+    info("Wait for page impression of tab 2.");
+    await waitForPageWithAdImpressions();
+
+    Assert.notEqual(
+      formattedUrl1.searchParams.get("s"),
+      formattedUrl2.searchParams.get("s"),
+      "The search query param in both tabs are different."
+    );
+
+    info("Open ad link of tab 2 in a new window.");
+    await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+      content.document.getElementById("ad1").setAttribute("target", "_blank");
+    });
+    let newWindowPromise = BrowserTestUtils.waitForNewWindow({
+      url: "https://example.com/ad",
+    });
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#ad1",
+      {},
+      tab2.linkedBrowser
+    );
+    let newWindow = await newWindowPromise;
+
+    await assertSearchSourcesTelemetry(
+      {},
+      {
+        "browser.search.content.unknown": { "example:tagged:ff": 2 },
+        "browser.search.withads.unknown": { "example:tagged": 2 },
+        "browser.search.adclicks.unknown": { "example:tagged": 1 },
+      }
+    );
+
+    assertSERPTelemetry([
+      {
+        impression: {
+          provider: "example",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+      {
+        impression: {
+          provider: "example",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        engagements: [
+          {
+            action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+            target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          },
+        ],
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+    ]);
+
+    // Clean-up.
+    await SpecialPowers.popPrefEnv();
+    BrowserTestUtils.removeTab(tab1);
+    BrowserTestUtils.removeTab(tab2);
+    await BrowserTestUtils.closeWindow(newWindow);
+    resetTelemetry();
+  }
+);
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_private.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_private.js
new file mode 100644
index 0000000000..ea7556c8f6
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_private.js
@@ -0,0 +1,135 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests load SERPs in Private Browsing Mode. Existing tests do so in
+ * non-Private Browsing Mode.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function load_2_pbm_serps_and_1_non_pbm_serp() {
+  info("Open private browsing window.");
+  let privateWindow = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+
+  info("Load SERP in a new tab.");
+  let url = getSERPUrl("searchTelemetry.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    privateWindow.gBrowser,
+    url
+  );
+  info("Wait for page impression.");
+  await waitForPageWithAdImpressions();
+
+  info("Load another SERP in the same tab.");
+  url = getSERPUrl("searchTelemetryAd.html");
+  BrowserTestUtils.startLoadingURIString(privateWindow.gBrowser, url);
+  info("Wait for page impression.");
+  await waitForPageWithAdImpressions();
+
+  info("Close private window.");
+  BrowserTestUtils.removeTab(tab);
+  await BrowserTestUtils.closeWindow(privateWindow);
+
+  info("Load SERP in non-private window.");
+  tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  info("Wait for page impression.");
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "true",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "true",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.TAB_CLOSE,
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Clean-up.
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_remote_settings_sync.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_remote_settings_sync.js
new file mode 100644
index 0000000000..5f2afcf6fc
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_remote_settings_sync.js
@@ -0,0 +1,329 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * When Remote Settings receives an update to search-telemetry-v2, we should
+ * trigger an update within SearchSERPTelemetry and SearchSERPTelemetryChild
+ * without requiring a user to restart their browser.
+ */
+
+requestLongerTimeout(5);
+
+ChromeUtils.defineESModuleGetters(this, {
+  ADLINK_CHECK_TIMEOUT_MS: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  RemoteSettings: "resource://services-settings/remote-settings.sys.mjs",
+  SEARCH_TELEMETRY_SHARED: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPCategorization: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPDomainToCategoriesMap:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+  TELEMETRY_SETTINGS_KEY: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+});
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    nonAdsLinkRegexps: [],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+const TEST_PROVIDER_BROKEN_VARIANT = [
+  {
+    ...TEST_PROVIDER_INFO[0],
+    queryParamNames: ["foo"],
+  },
+];
+
+const RECORDS = {
+  current: TEST_PROVIDER_INFO,
+  created: [],
+  updated: TEST_PROVIDER_INFO,
+  deleted: [],
+};
+
+const BROKEN_VARIANT_RECORDS = {
+  current: TEST_PROVIDER_BROKEN_VARIANT,
+  created: [],
+  updated: TEST_PROVIDER_BROKEN_VARIANT,
+  deleted: [],
+};
+
+const client = RemoteSettings(TELEMETRY_SETTINGS_KEY);
+const db = client.db;
+let record = TEST_PROVIDER_INFO[0];
+
+async function updateClientWithRecords(records) {
+  let promise = TestUtils.topicObserved("search-telemetry-v2-synced");
+
+  await client.emit("sync", { data: records });
+
+  info("Wait for SearchSERPTelemetry to update.");
+  await promise;
+}
+
+add_setup(async function () {
+  // Initialize the test with a variant of telemetry that won't trigger an
+  // impression due to an odd query param name.
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(
+    TEST_PROVIDER_BROKEN_VARIANT
+  );
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.serpEventTelemetry.enabled", true],
+      // Set the IPC count to a small number so that we only have to open
+      // one additional tab to reuse the same process.
+      ["dom.ipc.processCount.webIsolated", 1],
+    ],
+  });
+
+  // Shorten the time it takes to examine pages for ads.
+  Services.ppmm.sharedData.set(SEARCH_TELEMETRY_SHARED.LOAD_TIMEOUT, 500);
+  Services.ppmm.sharedData.flush();
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+    await db.clear();
+    await SpecialPowers.popPrefEnv();
+    Services.ppmm.sharedData.set(
+      SEARCH_TELEMETRY_SHARED.LOAD_TIMEOUT,
+      ADLINK_CHECK_TIMEOUT_MS
+    );
+    Services.ppmm.sharedData.flush();
+  });
+});
+
+add_task(async function update_telemetry_tab_already_open() {
+  info("Load SERP in a new tab.");
+  let url = getSERPUrl("searchTelemetryAd.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  info("Wait a brief amount of time for a possible SERP impression.");
+  await waitForIdle();
+
+  info("Assert no impressions are found.");
+  assertSERPTelemetry([]);
+
+  info("Update search-telemetry-v2 with a matching queryParamName.");
+  await updateClientWithRecords(RECORDS);
+
+  info("Reload page.");
+  gBrowser.reload();
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "reload",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Change search-telemetry-v2 back to the broken variant so that the next
+  // test can check updating the collection while no tabs are open results
+  // in a SERP check.
+  info("Update search-telemetry-v2 with non-matching queryParamName.");
+  await updateClientWithRecords(BROKEN_VARIANT_RECORDS);
+
+  info("Remove tab and reset telemetry.");
+  await BrowserTestUtils.removeTab(tab);
+  resetTelemetry();
+});
+
+add_task(async function update_telemetry_tab_closed() {
+  info("Load SERP in a new tab.");
+  let url = getSERPUrl("searchTelemetryAd.html");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  info("Wait a brief amount of time for a possible SERP impression.");
+  await waitForIdle();
+
+  info("Assert no impressions are found.");
+  assertSERPTelemetry([]);
+
+  info("Remove tab.");
+  await BrowserTestUtils.removeTab(tab);
+
+  info("Update search-telemetry-v2 with a matching queryParamName.");
+  await updateClientWithRecords(RECORDS);
+
+  info("Load SERP in a new tab.");
+  tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  info("Update search-telemetry-v2 with non-matching queryParamName.");
+  await updateClientWithRecords(BROKEN_VARIANT_RECORDS);
+
+  info("Remove tab and reset telemetry.");
+  await BrowserTestUtils.removeTab(tab);
+  resetTelemetry();
+});
+
+add_task(async function update_telemetry_multiple_tabs() {
+  info("Load SERP in a new tab.");
+  let url = getSERPUrl("searchTelemetryAd.html");
+
+  let tabs = [];
+  for (let index = 0; index < 5; ++index) {
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+    tabs.push(tab);
+  }
+
+  info("Wait a brief amount of time for a possible SERP impression.");
+  await waitForIdle();
+
+  info("Assert no impressions are found.");
+  assertSERPTelemetry([]);
+
+  info("Update search-telemetry-v2 with a matching queryParamName.");
+  await updateClientWithRecords(RECORDS);
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.switchTab(gBrowser, tab);
+    gBrowser.reload();
+    await waitForPageWithAdImpressions();
+
+    assertSERPTelemetry([
+      {
+        impression: {
+          provider: "example",
+          tagged: "true",
+          partner_code: "ff",
+          source: "reload",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+    ]);
+    await BrowserTestUtils.removeTab(tab);
+    resetTelemetry();
+  }
+
+  info("Update search-telemetry-v2 with non-matching queryParamName.");
+  await updateClientWithRecords(BROKEN_VARIANT_RECORDS);
+});
+
+add_task(async function update_telemetry_multiple_processes_and_tabs() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Set the IPC count to a higher number to allow for multiple processes
+      // for the same domain to be available.
+      ["dom.ipc.processCount.webIsolated", 4],
+    ],
+  });
+
+  info("Load SERP in a new tab.");
+  let url = getSERPUrl("searchTelemetryAd.html");
+
+  let tabs = [];
+  for (let index = 0; index < 8; ++index) {
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+    tabs.push(tab);
+  }
+
+  info("Wait a brief amount of time for a possible SERP impression.");
+  await waitForIdle();
+
+  info("Assert no impressions are found.");
+  assertSERPTelemetry([]);
+
+  info("Update search-telemetry-v2 with a matching queryParamName.");
+  await updateClientWithRecords(RECORDS);
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.switchTab(gBrowser, tab);
+    gBrowser.reload();
+    await waitForPageWithAdImpressions();
+
+    assertSERPTelemetry([
+      {
+        impression: {
+          provider: "example",
+          tagged: "true",
+          partner_code: "ff",
+          source: "reload",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+    ]);
+
+    await BrowserTestUtils.removeTab(tab);
+    resetTelemetry();
+  }
+
+  info("Update search-telemetry-v2 with non-matching queryParamName.");
+  await updateClientWithRecords(BROKEN_VARIANT_RECORDS);
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_searchbar.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_searchbar.js
new file mode 100644
index 0000000000..b9f85aaefa
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_searchbar.js
@@ -0,0 +1,442 @@
+"use strict";
+
+const SCALAR_SEARCHBAR = "browser.engagement.navigation.searchbar";
+
+ChromeUtils.defineESModuleGetters(this, {
+  UrlbarTestUtils: "resource://testing-common/UrlbarTestUtils.sys.mjs",
+});
+
+let suggestionEngine;
+
+function checkHistogramResults(resultIndexes, expected, histogram) {
+  for (let [i, val] of Object.entries(resultIndexes.values)) {
+    if (i == expected) {
+      Assert.equal(
+        val,
+        1,
+        `expected counts should match for ${histogram} index ${i}`
+      );
+    } else {
+      Assert.equal(
+        !!val,
+        false,
+        `unexpected counts should be zero for ${histogram} index ${i}`
+      );
+    }
+  }
+}
+
+/**
+ * Click one of the entries in the search suggestion popup.
+ *
+ * @param {string} entryName
+ *        The name of the elemet to click on.
+ * @param {object} [clickOptions]
+ *        The options to use for the click.
+ */
+function clickSearchbarSuggestion(entryName, clickOptions = {}) {
+  let richlistbox = BrowserSearch.searchBar.textbox.popup.richlistbox;
+  let richlistitem = Array.prototype.find.call(
+    richlistbox.children,
+    item => item.getAttribute("ac-value") == entryName
+  );
+
+  // Make sure the suggestion is visible and simulate the click.
+  richlistbox.ensureElementIsVisible(richlistitem);
+  EventUtils.synthesizeMouseAtCenter(richlistitem, clickOptions);
+}
+
+add_setup(async function () {
+  await gCUITestUtils.addSearchBar();
+  const url = getRootDirectory(gTestPath) + "telemetrySearchSuggestions.xml";
+  suggestionEngine = await SearchTestUtils.promiseNewSearchEngine({ url });
+
+  registerCleanupFunction(() => {
+    gCUITestUtils.removeSearchBar();
+  });
+
+  // Create two new search engines. Mark one as the default engine, so
+  // the test don't crash. We need to engines for this test as the searchbar
+  // doesn't display the default search engine among the one-off engines.
+  await SearchTestUtils.installSearchExtension(
+    {
+      name: "MozSearch",
+      keyword: "mozalias",
+    },
+    { setAsDefault: true }
+  );
+  await SearchTestUtils.installSearchExtension({
+    name: "MozSearch2",
+    keyword: "mozalias2",
+  });
+
+  // Move the second engine at the beginning of the one-off list.
+  let engineOneOff = Services.search.getEngineByName("MozSearch2");
+  await Services.search.moveEngine(engineOneOff, 0);
+
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  // Enable event recording for the events tested here.
+  Services.telemetry.setEventRecordingEnabled("navigation", true);
+
+  registerCleanupFunction(async function () {
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    Services.telemetry.setEventRecordingEnabled("navigation", false);
+  });
+});
+
+add_task(async function test_plainQuery() {
+  // Let's reset the counts.
+  Services.telemetry.clearScalars();
+  Services.telemetry.clearEvents();
+  let resultMethodHist = TelemetryTestUtils.getAndClearHistogram(
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+  let search_hist =
+    TelemetryTestUtils.getAndClearKeyedHistogram("SEARCH_COUNTS");
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+
+  info("Simulate entering a simple search.");
+  let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  await searchInSearchbar("simple query");
+  EventUtils.synthesizeKey("KEY_Enter");
+  await p;
+
+  // Check if the scalars contain the expected values.
+  const scalars = TelemetryTestUtils.getProcessScalars("parent", true, false);
+  TelemetryTestUtils.assertKeyedScalar(
+    scalars,
+    SCALAR_SEARCHBAR,
+    "search_enter",
+    1
+  );
+  Assert.equal(
+    Object.keys(scalars[SCALAR_SEARCHBAR]).length,
+    1,
+    "This search must only increment one entry in the scalar."
+  );
+
+  // Make sure SEARCH_COUNTS contains identical values.
+  TelemetryTestUtils.assertKeyedHistogramSum(
+    search_hist,
+    "other-MozSearch.searchbar",
+    1
+  );
+
+  // Also check events.
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "searchbar",
+        value: "enter",
+        extra: { engine: "other-MozSearch" },
+      },
+    ],
+    { category: "navigation", method: "search" }
+  );
+
+  // Check the histograms as well.
+  let resultMethods = resultMethodHist.snapshot();
+  checkHistogramResults(
+    resultMethods,
+    UrlbarTestUtils.SELECTED_RESULT_METHODS.enter,
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Performs a search using the first result, a one-off button, and the Return
+// (Enter) key.
+add_task(async function test_oneOff_enter() {
+  // Let's reset the counts.
+  Services.telemetry.clearScalars();
+  Services.telemetry.clearEvents();
+  let resultMethodHist = TelemetryTestUtils.getAndClearHistogram(
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+  let search_hist =
+    TelemetryTestUtils.getAndClearKeyedHistogram("SEARCH_COUNTS");
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+
+  info("Perform a one-off search using the first engine.");
+  let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  await searchInSearchbar("query");
+
+  info("Pressing Alt+Down to highlight the first one off engine.");
+  EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+  EventUtils.synthesizeKey("KEY_Enter");
+  await p;
+
+  // Check if the scalars contain the expected values.
+  const scalars = TelemetryTestUtils.getProcessScalars("parent", true, false);
+  TelemetryTestUtils.assertKeyedScalar(
+    scalars,
+    SCALAR_SEARCHBAR,
+    "search_oneoff",
+    1
+  );
+  Assert.equal(
+    Object.keys(scalars[SCALAR_SEARCHBAR]).length,
+    1,
+    "This search must only increment one entry in the scalar."
+  );
+
+  // Make sure SEARCH_COUNTS contains identical values.
+  TelemetryTestUtils.assertKeyedHistogramSum(
+    search_hist,
+    "other-MozSearch2.searchbar",
+    1
+  );
+
+  // Also check events.
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "searchbar",
+        value: "oneoff",
+        extra: { engine: "other-MozSearch2" },
+      },
+    ],
+    { category: "navigation", method: "search" }
+  );
+
+  // Check the histograms as well.
+  let resultMethods = resultMethodHist.snapshot();
+  checkHistogramResults(
+    resultMethods,
+    UrlbarTestUtils.SELECTED_RESULT_METHODS.enter,
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Performs a search using the second result, a one-off button, and the Return
+// (Enter) key.  This only tests the FX_SEARCHBAR_SELECTED_RESULT_METHOD
+// histogram since test_oneOff_enter covers everything else.
+add_task(async function test_oneOff_enterSelection() {
+  // Let's reset the counts.
+  Services.telemetry.clearScalars();
+  let resultMethodHist = TelemetryTestUtils.getAndClearHistogram(
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  let previousEngine = await Services.search.getDefault();
+  await Services.search.setDefault(
+    suggestionEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+
+  info("Type a query. Suggestions should be generated by the test engine.");
+  let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  await searchInSearchbar("query");
+
+  info(
+    "Select the second result, press Alt+Down to take us to the first one-off engine."
+  );
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  EventUtils.synthesizeKey("KEY_ArrowDown", { altKey: true });
+  EventUtils.synthesizeKey("KEY_Enter");
+  await p;
+
+  let resultMethods = resultMethodHist.snapshot();
+  checkHistogramResults(
+    resultMethods,
+    UrlbarTestUtils.SELECTED_RESULT_METHODS.enterSelection,
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  await Services.search.setDefault(
+    previousEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Performs a search using a click on a one-off button.  This only tests the
+// FX_SEARCHBAR_SELECTED_RESULT_METHOD histogram since test_oneOff_enter covers
+// everything else.
+add_task(async function test_oneOff_click() {
+  // Let's reset the counts.
+  Services.telemetry.clearScalars();
+  let resultMethodHist = TelemetryTestUtils.getAndClearHistogram(
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+
+  info("Type a query.");
+  let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  let popup = await searchInSearchbar("query");
+  info("Click the first one-off button.");
+  popup.oneOffButtons.getSelectableButtons(false)[0].click();
+  await p;
+
+  let resultMethods = resultMethodHist.snapshot();
+  checkHistogramResults(
+    resultMethods,
+    UrlbarTestUtils.SELECTED_RESULT_METHODS.click,
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+async function checkSuggestionClick(clickOptions, waitForActionFn) {
+  // Let's reset the counts.
+  Services.telemetry.clearScalars();
+  Services.telemetry.clearEvents();
+  let resultMethodHist = TelemetryTestUtils.getAndClearHistogram(
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+  let search_hist =
+    TelemetryTestUtils.getAndClearKeyedHistogram("SEARCH_COUNTS");
+
+  let previousEngine = await Services.search.getDefault();
+  await Services.search.setDefault(
+    suggestionEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+
+  info("Perform a one-off search using the first engine.");
+  let p = waitForActionFn(tab);
+  await searchInSearchbar("query");
+  info("Clicking the searchbar suggestion.");
+  clickSearchbarSuggestion("queryfoo", clickOptions);
+  await p;
+
+  // Check if the scalars contain the expected values.
+  const scalars = TelemetryTestUtils.getProcessScalars("parent", true, false);
+  TelemetryTestUtils.assertKeyedScalar(
+    scalars,
+    SCALAR_SEARCHBAR,
+    "search_suggestion",
+    1
+  );
+  Assert.equal(
+    Object.keys(scalars[SCALAR_SEARCHBAR]).length,
+    1,
+    "This search must only increment one entry in the scalar."
+  );
+
+  // Make sure SEARCH_COUNTS contains identical values.
+  let searchEngineId = "other-" + suggestionEngine.name;
+  TelemetryTestUtils.assertKeyedHistogramSum(
+    search_hist,
+    searchEngineId + ".searchbar",
+    1
+  );
+
+  // Also check events.
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "searchbar",
+        value: "suggestion",
+        extra: { engine: searchEngineId },
+      },
+    ],
+    { category: "navigation", method: "search" }
+  );
+
+  // Check the histograms as well.
+  let resultMethods = resultMethodHist.snapshot();
+  checkHistogramResults(
+    resultMethods,
+    UrlbarTestUtils.SELECTED_RESULT_METHODS.click,
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  await Services.search.setDefault(
+    previousEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  BrowserTestUtils.removeTab(tab);
+}
+
+// Clicks the first suggestion offered by the test search engine.
+add_task(async function test_suggestion_click() {
+  await checkSuggestionClick({}, tab => {
+    return BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  });
+});
+
+add_task(async function test_suggestion_middle_click() {
+  let openedTab;
+  await checkSuggestionClick({ button: 1 }, () => {
+    return BrowserTestUtils.waitForNewTab(
+      gBrowser,
+      // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+      "http://example.com/"
+    ).then(tab => (openedTab = tab));
+  });
+  BrowserTestUtils.removeTab(openedTab);
+});
+
+// Selects and presses the Return (Enter) key on the first suggestion offered by
+// the test search engine.  This only tests the
+// FX_SEARCHBAR_SELECTED_RESULT_METHOD histogram since test_suggestion_click
+// covers everything else.
+add_task(async function test_suggestion_enterSelection() {
+  // Let's reset the counts.
+  Services.telemetry.clearScalars();
+  let resultMethodHist = TelemetryTestUtils.getAndClearHistogram(
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  let previousEngine = await Services.search.getDefault();
+  await Services.search.setDefault(
+    suggestionEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+
+  info("Type a query. Suggestions should be generated by the test engine.");
+  let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  await searchInSearchbar("query");
+  info("Select the second result and press Return.");
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  EventUtils.synthesizeKey("KEY_Enter");
+  await p;
+
+  let resultMethods = resultMethodHist.snapshot();
+  checkHistogramResults(
+    resultMethods,
+    UrlbarTestUtils.SELECTED_RESULT_METHODS.enterSelection,
+    "FX_SEARCHBAR_SELECTED_RESULT_METHOD"
+  );
+
+  await Services.search.setDefault(
+    previousEngine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_shopping.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_shopping.js
new file mode 100644
index 0000000000..e2352b53f4
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_shopping.js
@@ -0,0 +1,143 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check the existence of a shopping tab and navigation to a shopping page.
+ * Most existing tests don't include shopping tabs, so this explicitly loads a
+ * page with a shopping tab and clicks on it.
+ */
+
+"use strict";
+
+// The setup for each test is the same, the only differences are the various
+// permutations of the search tests.
+const BASE_TEST_PROVIDER = {
+  telemetryId: "example",
+  searchPageRegexp:
+    /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd/,
+  queryParamNames: ["s"],
+  codeParamName: "abc",
+  taggedCodes: ["ff"],
+  extraAdServersRegexps: [/^https:\/\/example\.org\/ad/],
+  components: [
+    {
+      type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+      default: true,
+    },
+  ],
+};
+
+const TEST_PROVIDER_INFO_1 = [
+  {
+    ...BASE_TEST_PROVIDER,
+    shoppingTab: {
+      selector: "nav a",
+      regexp: "&page=shopping&",
+      inspectRegexpInSERP: true,
+    },
+  },
+];
+
+const TEST_PROVIDER_INFO_2 = [
+  {
+    ...BASE_TEST_PROVIDER,
+    shoppingTab: {
+      selector: "nav a#shopping",
+      regexp: "&page=shopping&",
+      inspectRegexpInSERP: false,
+    },
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO_1);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+async function loadSerpAndClickShoppingTab(page) {
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl(page)
+  );
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  BrowserTestUtils.synthesizeMouseAtCenter("#shopping", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "true",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.SHOPPING_TAB,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+}
+
+add_task(async function test_inspect_shopping_tab_regexp_on_serp() {
+  resetTelemetry();
+  await loadSerpAndClickShoppingTab("searchTelemetryAd_shopping.html");
+});
+
+add_task(async function test_no_inspect_shopping_tab_regexp_on_serp() {
+  resetTelemetry();
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO_2);
+  await waitForIdle();
+  await loadSerpAndClickShoppingTab("searchTelemetryAd_shopping.html");
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources.js
new file mode 100644
index 0000000000..7fa66a1adf
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources.js
@@ -0,0 +1,349 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Main tests for SearchSERPTelemetry - general engine visiting and link clicking.
+ *
+ * NOTE: As this test file is already fairly long-running, adding to this file
+ * will likely cause timeout errors with test-verify jobs on Treeherder.
+ * Therefore, please do not add further tasks to this file.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+/**
+ * Returns the index of the first search suggestion in the urlbar results.
+ *
+ * @returns {number} An index, or -1 if there are no search suggestions.
+ */
+async function getFirstSuggestionIndex() {
+  const matchCount = UrlbarTestUtils.getResultCount(window);
+  for (let i = 0; i < matchCount; i++) {
+    let result = await UrlbarTestUtils.getDetailsOfResultAt(window, i);
+    if (
+      result.type == UrlbarUtils.RESULT_TYPE.SEARCH &&
+      result.searchParams.suggestion
+    ) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+SearchTestUtils.init(this);
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.searches", true],
+      [
+        "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar",
+        true,
+      ],
+      // Ensure to add search suggestion telemetry as search_suggestion not search_formhistory.
+      ["browser.urlbar.maxHistoricalSearchSuggestions", 0],
+      ["browser.search.serpEventTelemetry.enabled", true],
+    ],
+  });
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  await SearchTestUtils.installSearchExtension(
+    {
+      search_url: getPageUrl(true),
+      search_url_get_params: "s={searchTerms}&abc=ff",
+      suggest_url:
+        "https://example.org/browser/browser/components/search/test/browser/searchSuggestionEngine.sjs",
+      suggest_url_get_params: "query={searchTerms}",
+    },
+    { setAsDefault: true }
+  );
+
+  await gCUITestUtils.addSearchBar();
+
+  registerCleanupFunction(async () => {
+    gCUITestUtils.removeSearchBar();
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+async function track_ad_click(
+  expectedHistogramSource,
+  expectedScalarSource,
+  searchAdsFn,
+  cleanupFn
+) {
+  searchCounts.clear();
+  Services.telemetry.clearScalars();
+
+  let expectedContentScalarKey = "example:tagged:ff";
+  let expectedScalarKey = "example:tagged";
+  let expectedHistogramSAPSourceKey = `other-Example.${expectedHistogramSource}`;
+  let expectedContentScalar = `browser.search.content.${expectedScalarSource}`;
+  let expectedWithAdsScalar = `browser.search.withads.${expectedScalarSource}`;
+  let expectedAdClicksScalar = `browser.search.adclicks.${expectedScalarSource}`;
+
+  let adImpressionPromise = waitForPageWithAdImpressions();
+  let tab = await searchAdsFn();
+
+  await assertSearchSourcesTelemetry(
+    {
+      [expectedHistogramSAPSourceKey]: 1,
+    },
+    {
+      [expectedContentScalar]: { [expectedContentScalarKey]: 1 },
+      [expectedWithAdsScalar]: { [expectedScalarKey]: 1 },
+    }
+  );
+
+  await adImpressionPromise;
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+  await promiseWaitForAdLinkCheck();
+
+  await assertSearchSourcesTelemetry(
+    {
+      [expectedHistogramSAPSourceKey]: 1,
+    },
+    {
+      [expectedContentScalar]: { [expectedContentScalarKey]: 1 },
+      [expectedWithAdsScalar]: { [expectedScalarKey]: 1 },
+      [expectedAdClicksScalar]: { [expectedScalarKey]: 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: expectedScalarSource,
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await cleanupFn();
+
+  Services.fog.testResetFOG();
+}
+
+add_task(async function test_source_urlbar() {
+  let tab;
+  await track_ad_click(
+    "urlbar",
+    "urlbar",
+    async () => {
+      tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+      await UrlbarTestUtils.promiseAutocompleteResultPopup({
+        window,
+        value: "searchSuggestion",
+      });
+      let idx = await getFirstSuggestionIndex();
+      Assert.greaterOrEqual(idx, 0, "there should be a first suggestion");
+      let loadPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+      while (idx--) {
+        EventUtils.sendKey("down");
+      }
+      EventUtils.sendKey("return");
+      await loadPromise;
+      return tab;
+    },
+    async () => {
+      BrowserTestUtils.removeTab(tab);
+    }
+  );
+});
+
+add_task(async function test_source_urlbar_handoff() {
+  let tab;
+  await track_ad_click(
+    "urlbar-handoff",
+    "urlbar_handoff",
+    async () => {
+      Services.fog.testResetFOG();
+      tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+      BrowserTestUtils.startLoadingURIString(tab.linkedBrowser, "about:newtab");
+      await BrowserTestUtils.browserStopped(tab.linkedBrowser, "about:newtab");
+
+      info("Focus on search input in newtab content");
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        ".fake-editable",
+        {},
+        tab.linkedBrowser
+      );
+
+      info("Get suggestions");
+      for (const c of "searchSuggestion".split("")) {
+        EventUtils.synthesizeKey(c);
+        /* eslint-disable mozilla/no-arbitrary-setTimeout */
+        await new Promise(r => setTimeout(r, 50));
+      }
+      await TestUtils.waitForCondition(async () => {
+        const index = await getFirstSuggestionIndex();
+        return index >= 0;
+      }, "Wait until suggestions are ready");
+
+      let idx = await getFirstSuggestionIndex();
+      Assert.greaterOrEqual(idx, 0, "there should be a first suggestion");
+      const onLoaded = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+      while (idx--) {
+        EventUtils.sendKey("down");
+      }
+      EventUtils.sendKey("return");
+      await onLoaded;
+
+      return tab;
+    },
+    async () => {
+      const issueRecords = Glean.newtabSearch.issued.testGetValue();
+      Assert.ok(!!issueRecords, "Must have recorded a search issuance");
+      Assert.equal(issueRecords.length, 1, "One search, one event");
+      const newtabVisitId = issueRecords[0].extra.newtab_visit_id;
+      Assert.ok(!!newtabVisitId, "Must have a visit id");
+      Assert.deepEqual(
+        {
+          // Yes, this is tautological. But I want to use deepEqual.
+          newtab_visit_id: newtabVisitId,
+          search_access_point: "urlbar_handoff",
+          telemetry_id: "other-Example",
+        },
+        issueRecords[0].extra,
+        "Must have recorded the expected information."
+      );
+      const impRecords = Glean.newtabSearchAd.impression.testGetValue();
+      Assert.equal(impRecords.length, 1, "One impression, one event.");
+      Assert.deepEqual(
+        {
+          newtab_visit_id: newtabVisitId,
+          search_access_point: "urlbar_handoff",
+          telemetry_id: "example",
+          is_tagged: "true",
+          is_follow_on: "false",
+        },
+        impRecords[0].extra,
+        "Must have recorded the expected information."
+      );
+      const clickRecords = Glean.newtabSearchAd.click.testGetValue();
+      Assert.equal(clickRecords.length, 1, "One click, one event.");
+      Assert.deepEqual(
+        {
+          newtab_visit_id: newtabVisitId,
+          search_access_point: "urlbar_handoff",
+          telemetry_id: "example",
+          is_tagged: "true",
+          is_follow_on: "false",
+        },
+        clickRecords[0].extra,
+        "Must have recorded the expected information."
+      );
+      BrowserTestUtils.removeTab(tab);
+    }
+  );
+});
+
+add_task(async function test_source_searchbar() {
+  let tab;
+  await track_ad_click(
+    "searchbar",
+    "searchbar",
+    async () => {
+      tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+      let sb = BrowserSearch.searchBar;
+      // Write the search query in the searchbar.
+      sb.focus();
+      sb.value = "searchSuggestion";
+      sb.textbox.controller.startSearch("searchSuggestion");
+      // Wait for the popup to show.
+      await BrowserTestUtils.waitForEvent(sb.textbox.popup, "popupshown");
+      // And then for the search to complete.
+      await BrowserTestUtils.waitForCondition(
+        () =>
+          sb.textbox.controller.searchStatus >=
+          Ci.nsIAutoCompleteController.STATUS_COMPLETE_NO_MATCH,
+        "The search in the searchbar must complete."
+      );
+
+      let loadPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+      EventUtils.synthesizeKey("KEY_Enter");
+      await loadPromise;
+      return tab;
+    },
+    async () => {
+      BrowserTestUtils.removeTab(tab);
+    }
+  );
+});
+
+add_task(async function test_source_system() {
+  let tab;
+  await track_ad_click(
+    "system",
+    "system",
+    async () => {
+      tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+      let loadPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+      // This is not quite the same as calling from the commandline, but close
+      // enough for this test.
+      BrowserSearch.loadSearchFromCommandLine(
+        "searchSuggestion",
+        false,
+        Services.scriptSecurityManager.getSystemPrincipal(),
+        gBrowser.selectedBrowser.csp
+      );
+
+      await loadPromise;
+      return tab;
+    },
+    async () => {
+      BrowserTestUtils.removeTab(tab);
+    }
+  );
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_about.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_about.js
new file mode 100644
index 0000000000..a313c75ac7
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_about.js
@@ -0,0 +1,225 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Main tests for SearchSERPTelemetry - general engine visiting and link
+ * clicking on about pages.
+ *
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+/**
+ * Returns the index of the first search suggestion in the urlbar results.
+ *
+ * @returns {number} An index, or -1 if there are no search suggestions.
+ */
+async function getFirstSuggestionIndex() {
+  const matchCount = UrlbarTestUtils.getResultCount(window);
+  for (let i = 0; i < matchCount; i++) {
+    let result = await UrlbarTestUtils.getDetailsOfResultAt(window, i);
+    if (
+      result.type == UrlbarUtils.RESULT_TYPE.SEARCH &&
+      result.searchParams.suggestion
+    ) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+SearchTestUtils.init(this);
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.searches", true],
+      [
+        "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar",
+        true,
+      ],
+      // Ensure to add search suggestion telemetry as search_suggestion not search_formhistory.
+      ["browser.urlbar.maxHistoricalSearchSuggestions", 0],
+      ["browser.search.serpEventTelemetry.enabled", true],
+    ],
+  });
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  await SearchTestUtils.installSearchExtension(
+    {
+      search_url: getPageUrl(true),
+      search_url_get_params: "s={searchTerms}&abc=ff",
+      suggest_url:
+        "https://example.org/browser/browser/components/search/test/browser/searchSuggestionEngine.sjs",
+      suggest_url_get_params: "query={searchTerms}",
+    },
+    { setAsDefault: true }
+  );
+
+  await gCUITestUtils.addSearchBar();
+
+  registerCleanupFunction(async () => {
+    gCUITestUtils.removeSearchBar();
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+async function track_ad_click(
+  expectedHistogramSource,
+  expectedScalarSource,
+  searchAdsFn,
+  cleanupFn
+) {
+  searchCounts.clear();
+  Services.telemetry.clearScalars();
+
+  let expectedContentScalarKey = "example:tagged:ff";
+  let expectedScalarKey = "example:tagged";
+  let expectedHistogramSAPSourceKey = `other-Example.${expectedHistogramSource}`;
+  let expectedContentScalar = `browser.search.content.${expectedScalarSource}`;
+  let expectedWithAdsScalar = `browser.search.withads.${expectedScalarSource}`;
+  let expectedAdClicksScalar = `browser.search.adclicks.${expectedScalarSource}`;
+
+  let adImpressionPromise = waitForPageWithAdImpressions();
+  let tab = await searchAdsFn();
+
+  await assertSearchSourcesTelemetry(
+    {
+      [expectedHistogramSAPSourceKey]: 1,
+    },
+    {
+      [expectedContentScalar]: { [expectedContentScalarKey]: 1 },
+      [expectedWithAdsScalar]: { [expectedScalarKey]: 1 },
+    }
+  );
+
+  await adImpressionPromise;
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+  await promiseWaitForAdLinkCheck();
+
+  await assertSearchSourcesTelemetry(
+    {
+      [expectedHistogramSAPSourceKey]: 1,
+    },
+    {
+      [expectedContentScalar]: { [expectedContentScalarKey]: 1 },
+      [expectedWithAdsScalar]: { [expectedScalarKey]: 1 },
+      [expectedAdClicksScalar]: { [expectedScalarKey]: 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: expectedScalarSource,
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await cleanupFn();
+
+  Services.fog.testResetFOG();
+}
+
+async function checkAboutPage(
+  page,
+  expectedHistogramSource,
+  expectedScalarSource
+) {
+  let tab;
+  await track_ad_click(
+    expectedHistogramSource,
+    expectedScalarSource,
+    async () => {
+      tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+      BrowserTestUtils.startLoadingURIString(tab.linkedBrowser, page);
+      await BrowserTestUtils.browserStopped(tab.linkedBrowser, page);
+
+      // Wait for the full load.
+      await SpecialPowers.pushPrefEnv({
+        set: [
+          [
+            "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar",
+            false,
+          ],
+        ],
+      });
+      await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+        await ContentTaskUtils.waitForCondition(
+          () => content.wrappedJSObject.gContentSearchController.defaultEngine
+        );
+      });
+
+      let p = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+      await typeInSearchField(
+        tab.linkedBrowser,
+        "test query",
+        "newtab-search-text"
+      );
+      await BrowserTestUtils.synthesizeKey("VK_RETURN", {}, tab.linkedBrowser);
+      await p;
+      return tab;
+    },
+    async () => {
+      BrowserTestUtils.removeTab(tab);
+      await SpecialPowers.popPrefEnv();
+    }
+  );
+}
+
+add_task(async function test_source_about_home() {
+  await checkAboutPage("about:home", "abouthome", "about_home");
+});
+
+add_task(async function test_source_about_newtab() {
+  await checkAboutPage("about:newtab", "newtab", "about_newtab");
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads.js
new file mode 100644
index 0000000000..0fd93da30f
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads.js
@@ -0,0 +1,378 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Main tests for SearchSERPTelemetry - general engine visiting and link clicking.
+ */
+
+"use strict";
+
+// Note: example.org is used for the SERP page, and example.com is used to serve
+// the ads. This is done to simulate different domains like the real servers.
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?.html/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+function getSERPFollowOnUrl(page) {
+  return page + "?s=test&abc=ff&a=foo";
+}
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_simple_search_page_visit() {
+  resetTelemetry();
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: getSERPUrl("searchTelemetry.html"),
+    },
+    async () => {
+      await assertSearchSourcesTelemetry(
+        {},
+        {
+          "browser.search.content.unknown": { "example:tagged:ff": 1 },
+        }
+      );
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.TAB_CLOSE,
+      },
+    },
+  ]);
+});
+
+add_task(async function test_simple_search_page_visit_telemetry() {
+  resetTelemetry();
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      /* URL must not be in the cache */
+      url: getSERPUrl("searchTelemetry.html") + `&random=${Math.random()}`,
+    },
+    async () => {
+      let scalars = {};
+      const key = "browser.search.data_transferred";
+
+      await TestUtils.waitForCondition(() => {
+        scalars =
+          Services.telemetry.getSnapshotForKeyedScalars("main", false).parent ||
+          {};
+        return key in scalars;
+      }, "should have the expected keyed scalars");
+
+      const scalar = scalars[key];
+      Assert.ok("example" in scalar, "correct telemetry category");
+      Assert.notEqual(scalars[key].example, 0, "bandwidth logged");
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.TAB_CLOSE,
+      },
+    },
+  ]);
+});
+
+add_task(async function test_follow_on_visit() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: getSERPFollowOnUrl(getPageUrl()),
+    },
+    async () => {
+      await assertSearchSourcesTelemetry(
+        {},
+        {
+          "browser.search.content.unknown": {
+            "example:tagged:ff": 1,
+            "example:tagged-follow-on:ff": 1,
+          },
+        }
+      );
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.TAB_CLOSE,
+      },
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.TAB_CLOSE,
+      },
+    },
+  ]);
+});
+
+add_task(async function test_track_ad() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_track_ad_organic() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd.html", true)
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:organic:none": 1 },
+      "browser.search.withads.unknown": { "example:organic": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_track_ad_new_window() {
+  resetTelemetry();
+
+  let win = await BrowserTestUtils.openNewBrowserWindow();
+
+  let url = getSERPUrl("searchTelemetryAd.html");
+  BrowserTestUtils.startLoadingURIString(win.gBrowser.selectedBrowser, url);
+  await BrowserTestUtils.browserLoaded(
+    win.gBrowser.selectedBrowser,
+    false,
+    url
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.closeWindow(win);
+});
+
+add_task(async function test_track_ad_pages_without_ads() {
+  // Note: the above tests have already checked a page with no ad-urls.
+  resetTelemetry();
+
+  let tabs = [];
+
+  tabs.push(
+    await BrowserTestUtils.openNewForegroundTab(
+      gBrowser,
+      getSERPUrl("searchTelemetry.html")
+    )
+  );
+  await waitForPageWithAdImpressions();
+
+  tabs.push(
+    await BrowserTestUtils.openNewForegroundTab(
+      gBrowser,
+      getSERPUrl("searchTelemetryAd.html")
+    )
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:tagged:ff": 2 },
+      "browser.search.withads.unknown": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  for (let tab of tabs) {
+    BrowserTestUtils.removeTab(tab);
+  }
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_clicks.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_clicks.js
new file mode 100644
index 0000000000..11d2176563
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_clicks.js
@@ -0,0 +1,373 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests for SearchSERPTelemetry associated with ad clicks.
+ */
+
+"use strict";
+
+// Note: example.org is used for the SERP page, and example.com is used to serve
+// the ads. This is done to simulate different domains like the real servers.
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?.html/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+async function track_ad_click(testOrganic) {
+  // Note: the above tests have already checked a page with no ad-urls.
+  resetTelemetry();
+
+  let expectedScalarKey = `example:${testOrganic ? "organic" : "tagged"}`;
+  let expectedContentScalarKey = `example:${
+    testOrganic ? "organic:none" : "tagged:ff"
+  }`;
+  let tagged = testOrganic ? "false" : "true";
+  let partnerCode = testOrganic ? "" : "ff";
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd.html", testOrganic)
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { [expectedContentScalarKey]: 1 },
+      "browser.search.withads.unknown": {
+        [expectedScalarKey.replace("sap", "tagged")]: 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged,
+        partner_code: partnerCode,
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+  await promiseWaitForAdLinkCheck();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { [expectedContentScalarKey]: 1 },
+      "browser.search.withads.unknown": { [expectedScalarKey]: 1 },
+      "browser.search.adclicks.unknown": { [expectedScalarKey]: 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged,
+        partner_code: partnerCode,
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Now go back, and click again.
+  pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  gBrowser.goBack();
+  await pageLoadPromise;
+  await waitForPageWithAdImpressions();
+
+  // We've gone back, so we register an extra display & if it is with ads or not.
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.tabhistory": { [expectedContentScalarKey]: 1 },
+      "browser.search.content.unknown": { [expectedContentScalarKey]: 1 },
+      "browser.search.withads.tabhistory": { [expectedScalarKey]: 1 },
+      "browser.search.withads.unknown": { [expectedScalarKey]: 1 },
+      "browser.search.adclicks.unknown": { [expectedScalarKey]: 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged,
+        partner_code: partnerCode,
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged,
+        partner_code: partnerCode,
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+  await promiseWaitForAdLinkCheck();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.tabhistory": { [expectedContentScalarKey]: 1 },
+      "browser.search.content.unknown": { [expectedContentScalarKey]: 1 },
+      "browser.search.withads.tabhistory": { [expectedScalarKey]: 1 },
+      "browser.search.withads.unknown": { [expectedScalarKey]: 1 },
+      "browser.search.adclicks.tabhistory": { [expectedScalarKey]: 1 },
+      "browser.search.adclicks.unknown": { [expectedScalarKey]: 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged,
+        partner_code: partnerCode,
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged,
+        partner_code: partnerCode,
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+}
+
+add_task(async function test_track_ad_click() {
+  await track_ad_click(false);
+});
+
+add_task(async function test_track_ad_click_organic() {
+  await track_ad_click(true);
+});
+
+add_task(async function test_track_ad_click_with_location_change_other_tab() {
+  resetTelemetry();
+  const url = getSERPUrl("searchTelemetryAd.html");
+  let adImpressionPromise = waitForPageWithAdImpressions();
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+  await adImpressionPromise;
+
+  const newTab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "https://example.com"
+  );
+
+  await BrowserTestUtils.switchTab(gBrowser, tab);
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example:tagged": 1 },
+      "browser.search.adclicks.unknown": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(newTab);
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_data_attributes.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_data_attributes.js
new file mode 100644
index 0000000000..3c5e0a464e
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_data_attributes.js
@@ -0,0 +1,173 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests for SearchSERPTelemetry associated with ad links found in data attributes.
+ */
+
+"use strict";
+
+// Note: example.org is used for the SERP page, and example.com is used to serve
+// the ads. This is done to simulate different domains like the real servers.
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example-data-attributes",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetryAd_dataAttributes(?:_none|_href)?.html/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["xyz"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_track_ad_on_data_attributes() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd_dataAttributes.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example-data-attributes:tagged:ff": 1,
+      },
+      "browser.search.withads.unknown": {
+        "example-data-attributes:tagged": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example-data-attributes",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_track_ad_on_data_attributes_and_hrefs() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd_dataAttributes_href.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example-data-attributes:tagged:ff": 1,
+      },
+      "browser.search.withads.unknown": {
+        "example-data-attributes:tagged": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example-data-attributes",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_track_no_ad_on_data_attributes_and_hrefs() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("searchTelemetryAd_dataAttributes_none.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example-data-attributes:tagged:ff": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example-data-attributes",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_load_events.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_load_events.js
new file mode 100644
index 0000000000..069e13d339
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_ads_load_events.js
@@ -0,0 +1,142 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests for SearchSERPTelemetry associated with ad links and load events.
+ */
+
+"use strict";
+
+// Note: example.org is used for the SERP page, and example.com is used to serve
+// the ads. This is done to simulate different domains like the real servers.
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "slow-page-load",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/slow_loading_page_with_ads(_on_load_event)?.html/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_track_ad_on_DOMContentLoaded() {
+  resetTelemetry();
+
+  let observeAdPreviouslyRecorded = TestUtils.consoleMessageObserved(msg => {
+    return (
+      typeof msg.wrappedJSObject.arguments?.[0] == "string" &&
+      msg.wrappedJSObject.arguments[0].includes(
+        "Ad was previously reported for browser with URI"
+      )
+    );
+  });
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("slow_loading_page_with_ads.html")
+  );
+
+  // Observe ad was counted on DOMContentLoaded.
+  // We do not count the ad again on load.
+  await observeAdPreviouslyRecorded;
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "slow-page-load:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "slow-page-load:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "slow-page-load",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_track_ad_on_load_event() {
+  resetTelemetry();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    getSERPUrl("slow_loading_page_with_ads_on_load_event.html")
+  );
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "slow-page-load:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "slow-page-load:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "slow-page-load",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_in_content.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_in_content.js
new file mode 100644
index 0000000000..9bff667857
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_in_content.js
@@ -0,0 +1,506 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * SearchSERPTelemetry tests related to in-content sources.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+        included: {
+          parent: {
+            selector: ".refined-search-buttons",
+          },
+          children: [
+            {
+              selector: "a",
+            },
+          ],
+        },
+        topDown: true,
+      },
+    ],
+  },
+];
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.serpEventTelemetry.enabled", true]],
+  });
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_source_opened_in_new_tab_via_middle_click() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + "searchTelemetryAd_searchbox_with_content.html?s=test+one+two+three";
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, targetUrl, true);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#related-in-page",
+    { button: 1 },
+    tab1.linkedBrowser
+  );
+  let tab2 = await tabPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "opened_in_new_tab",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+});
+
+add_task(async function test_source_opened_in_new_tab_via_target_blank() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + "searchTelemetryAd_searchbox_with_content.html?s=test+one+two+three";
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, targetUrl, true);
+  // Note: the anchor element with id "related-new-tab" has a target=_blank
+  // attribute.
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#related-new-tab",
+    {},
+    tab1.linkedBrowser
+  );
+  let tab2 = await tabPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "opened_in_new_tab",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+});
+
+add_task(async function test_source_opened_in_new_tab_via_context_menu() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + "searchTelemetryAd_searchbox_with_content.html?s=test+one+two+three";
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, targetUrl, true);
+
+  let contextMenu = document.getElementById("contentAreaContextMenu");
+  let popupShownPromise = BrowserTestUtils.waitForEvent(
+    contextMenu,
+    "popupshown"
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "a#related-in-page",
+    {
+      button: 2,
+      type: "contextmenu",
+    },
+    tab1.linkedBrowser
+  );
+  await popupShownPromise;
+
+  let openLinkInNewTabMenuItem = contextMenu.querySelector(
+    "#context-openlinkintab"
+  );
+  contextMenu.activateItem(openLinkInNewTabMenuItem);
+
+  let tab2 = await tabPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "false",
+        partner_code: "",
+        source: "opened_in_new_tab",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+});
+
+add_task(
+  async function test_source_refinement_button_clicked_no_partner_code() {
+    resetTelemetry();
+    let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+    await waitForPageWithAdImpressions();
+
+    let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#refined-search-button",
+      {},
+      tab.linkedBrowser
+    );
+    await pageLoadPromise;
+    await waitForPageWithAdImpressions();
+
+    assertSERPTelemetry([
+      {
+        impression: {
+          provider: "example",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        engagements: [
+          {
+            action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+            target: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          },
+        ],
+        adImpressions: [
+          {
+            component:
+              SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+            ads_loaded: "1",
+            ads_visible: "1",
+            ads_hidden: "0",
+          },
+        ],
+      },
+      {
+        impression: {
+          provider: "example",
+          tagged: "false",
+          partner_code: "",
+          source: "follow_on_from_refine_on_SERP",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        adImpressions: [
+          {
+            component:
+              SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+            ads_loaded: "1",
+            ads_visible: "1",
+            ads_hidden: "0",
+          },
+        ],
+      },
+    ]);
+
+    BrowserTestUtils.removeTab(tab);
+  }
+);
+
+add_task(
+  async function test_source_refinement_button_clicked_with_partner_code() {
+    resetTelemetry();
+    let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+    await waitForPageWithAdImpressions();
+
+    let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#refined-search-button-with-partner-code",
+      {},
+      tab.linkedBrowser
+    );
+    await pageLoadPromise;
+    await waitForPageWithAdImpressions();
+
+    assertSERPTelemetry([
+      {
+        impression: {
+          provider: "example",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        engagements: [
+          {
+            action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+            target: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          },
+        ],
+        adImpressions: [
+          {
+            component:
+              SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+            ads_loaded: "1",
+            ads_visible: "1",
+            ads_hidden: "0",
+          },
+        ],
+      },
+      {
+        impression: {
+          provider: "example",
+          tagged: "true",
+          partner_code: "ff",
+          source: "follow_on_from_refine_on_SERP",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        adImpressions: [
+          {
+            component:
+              SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+            ads_loaded: "1",
+            ads_visible: "1",
+            ads_hidden: "0",
+          },
+        ],
+      },
+    ]);
+
+    BrowserTestUtils.removeTab(tab);
+  }
+);
+
+// When a user opens a refinement button link in a new tab, we want the
+// source to be recorded as "follow_on_from_refine_on_SERP", not
+// "opened_in_new_tab", since the refinement button click provides greater
+// context.
+add_task(async function test_refinement_button_vs_opened_in_new_tab() {
+  resetTelemetry();
+  let url = getSERPUrl("searchTelemetryAd_searchbox_with_content.html");
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await waitForPageWithAdImpressions();
+
+  let targetUrl =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + "searchTelemetryAd_searchbox_with_content.html?s=test2&abc=ff";
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, targetUrl, true);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#refined-search-button-with-partner-code",
+    { button: 1 },
+    tab1.linkedBrowser
+  );
+  let tab2 = await tabPromise;
+  await waitForPageWithAdImpressions();
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "follow_on_from_refine_on_SERP",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.REFINED_SEARCH_BUTTONS,
+          ads_loaded: "1",
+          ads_visible: "1",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_navigation.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_navigation.js
new file mode 100644
index 0000000000..7ce681701a
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_navigation.js
@@ -0,0 +1,684 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Main tests for SearchSERPTelemetry - general engine visiting and link clicking.
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?.html/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+/**
+ * Returns the index of the first search suggestion in the urlbar results.
+ *
+ * @returns {number} An index, or -1 if there are no search suggestions.
+ */
+async function getFirstSuggestionIndex() {
+  const matchCount = UrlbarTestUtils.getResultCount(window);
+  for (let i = 0; i < matchCount; i++) {
+    let result = await UrlbarTestUtils.getDetailsOfResultAt(window, i);
+    if (
+      result.type == UrlbarUtils.RESULT_TYPE.SEARCH &&
+      result.searchParams.suggestion
+    ) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+SearchTestUtils.init(this);
+
+let tab;
+
+add_setup(async function () {
+  searchCounts.clear();
+  Services.telemetry.clearScalars();
+
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.searches", true],
+      ["browser.search.serpEventTelemetry.enabled", true],
+    ],
+  });
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  await SearchTestUtils.installSearchExtension(
+    {
+      search_url: getPageUrl(true),
+      search_url_get_params: "s={searchTerms}&abc=ff",
+      suggest_url:
+        "https://example.com/browser/browser/components/search/test/browser/searchSuggestionEngine.sjs",
+      suggest_url_get_params: "query={searchTerms}",
+    },
+    { setAsDefault: true }
+  );
+
+  tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  registerCleanupFunction(async () => {
+    BrowserTestUtils.removeTab(tab);
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+// These tests are consecutive and intentionally build on the results of the
+// previous test.
+
+async function loadSearchPage() {
+  await UrlbarTestUtils.promiseAutocompleteResultPopup({
+    window,
+    value: "searchSuggestion",
+  });
+  let idx = await getFirstSuggestionIndex();
+  Assert.greaterOrEqual(idx, 0, "there should be a first suggestion");
+  let loadPromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  while (idx--) {
+    EventUtils.sendKey("down");
+  }
+  EventUtils.sendKey("return");
+  await loadPromise;
+}
+
+add_task(async function test_search() {
+  Services.fog.testResetFOG();
+  // Load a page via the address bar.
+  await loadSearchPage();
+  await waitForPageWithAdImpressions();
+
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+});
+
+add_task(async function test_reload() {
+  let adImpressionPromise = waitForPageWithAdImpressions();
+  let promise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  tab.linkedBrowser.reload();
+  await promise;
+  await adImpressionPromise;
+
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.content.reload": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+      "browser.search.withads.reload": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "reload",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.content.reload": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+      "browser.search.withads.reload": { "example:tagged": 1 },
+      "browser.search.adclicks.reload": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "reload",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+});
+
+let searchUrl;
+
+add_task(async function test_fresh_search() {
+  resetTelemetry();
+
+  // Load a page via the address bar.
+  let adImpressionPromise = waitForPageWithAdImpressions();
+  await loadSearchPage();
+  await adImpressionPromise;
+
+  searchUrl = tab.linkedBrowser.url;
+
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+});
+
+add_task(async function test_click_ad() {
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+      "browser.search.adclicks.urlbar": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+});
+
+add_task(async function test_go_back() {
+  let adImpressionPromise = waitForPageWithAdImpressions();
+  let promise = BrowserTestUtils.waitForLocationChange(gBrowser, searchUrl);
+  tab.linkedBrowser.goBack();
+  await promise;
+  await adImpressionPromise;
+
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.content.tabhistory": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+      "browser.search.withads.tabhistory": { "example:tagged": 1 },
+      "browser.search.adclicks.urlbar": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.content.tabhistory": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+      "browser.search.withads.tabhistory": { "example:tagged": 1 },
+      "browser.search.adclicks.urlbar": { "example:tagged": 1 },
+      "browser.search.adclicks.tabhistory": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+});
+
+// Conduct a search from the Urlbar with showSearchTerms enabled.
+add_task(async function test_fresh_search_with_urlbar_persisted() {
+  resetTelemetry();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.showSearchTerms.featureGate", true],
+      ["browser.urlbar.tipShownCount.searchTip_persist", 999],
+    ],
+  });
+
+  // Load a SERP once in order to show the search term in the Urlbar.
+  let adImpressionPromise = waitForPageWithAdImpressions();
+  await loadSearchPage();
+  await adImpressionPromise;
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Do another search from the context of the default SERP.
+  adImpressionPromise = waitForPageWithAdImpressions();
+  await loadSearchPage();
+  await adImpressionPromise;
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+      "other-Example.urlbar-persisted": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+      "browser.search.content.urlbar_persisted": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar_persisted": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar_persisted",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  // Click on an ad.
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  await BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+
+  await pageLoadPromise;
+  await assertSearchSourcesTelemetry(
+    {
+      "other-Example.urlbar": 1,
+      "other-Example.urlbar-persisted": 1,
+    },
+    {
+      "browser.search.content.urlbar": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar": { "example:tagged": 1 },
+      "browser.search.content.urlbar_persisted": { "example:tagged:ff": 1 },
+      "browser.search.withads.urlbar_persisted": { "example:tagged": 1 },
+      "browser.search.adclicks.urlbar_persisted": { "example:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: "urlbar_persisted",
+        shopping_tab_displayed: "false",
+        is_shopping_page: "false",
+        is_private: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_webextension.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_webextension.js
new file mode 100644
index 0000000000..f7b22f004b
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_sources_webextension.js
@@ -0,0 +1,219 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Main tests for SearchSERPTelemetry - general engine visiting and
+ * link clicking with Web Extensions.
+ *
+ */
+
+"use strict";
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetry(?:Ad)?/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/example\.com\/ad2?/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+SearchTestUtils.init(this);
+
+add_setup(async function () {
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  await waitForIdle();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.searches", true],
+      [
+        "browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar",
+        true,
+      ],
+      // Ensure to add search suggestion telemetry as search_suggestion not search_formhistory.
+      ["browser.urlbar.maxHistoricalSearchSuggestions", 0],
+      ["browser.search.serpEventTelemetry.enabled", true],
+    ],
+  });
+  // Enable local telemetry recording for the duration of the tests.
+  let oldCanRecord = Services.telemetry.canRecordExtended;
+  Services.telemetry.canRecordExtended = true;
+
+  await SearchTestUtils.installSearchExtension(
+    {
+      search_url: getPageUrl(true),
+      search_url_get_params: "s={searchTerms}&abc=ff",
+      suggest_url:
+        "https://example.org/browser/browser/components/search/test/browser/searchSuggestionEngine.sjs",
+      suggest_url_get_params: "query={searchTerms}",
+    },
+    { setAsDefault: true }
+  );
+
+  await gCUITestUtils.addSearchBar();
+
+  registerCleanupFunction(async () => {
+    gCUITestUtils.removeSearchBar();
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    Services.telemetry.canRecordExtended = oldCanRecord;
+    resetTelemetry();
+  });
+});
+
+async function track_ad_click(
+  expectedHistogramSource,
+  expectedScalarSource,
+  searchAdsFn,
+  cleanupFn
+) {
+  searchCounts.clear();
+  Services.telemetry.clearScalars();
+
+  let expectedContentScalarKey = "example:tagged:ff";
+  let expectedScalarKey = "example:tagged";
+  let expectedHistogramSAPSourceKey = `other-Example.${expectedHistogramSource}`;
+  let expectedContentScalar = `browser.search.content.${expectedScalarSource}`;
+  let expectedWithAdsScalar = `browser.search.withads.${expectedScalarSource}`;
+  let expectedAdClicksScalar = `browser.search.adclicks.${expectedScalarSource}`;
+
+  let adImpressionPromise = waitForPageWithAdImpressions();
+  let tab = await searchAdsFn();
+
+  await assertSearchSourcesTelemetry(
+    {
+      [expectedHistogramSAPSourceKey]: 1,
+    },
+    {
+      [expectedContentScalar]: { [expectedContentScalarKey]: 1 },
+      [expectedWithAdsScalar]: { [expectedScalarKey]: 1 },
+    }
+  );
+
+  await adImpressionPromise;
+
+  let pageLoadPromise = BrowserTestUtils.waitForLocationChange(gBrowser);
+  BrowserTestUtils.synthesizeMouseAtCenter("#ad1", {}, tab.linkedBrowser);
+  await pageLoadPromise;
+  await promiseWaitForAdLinkCheck();
+
+  await assertSearchSourcesTelemetry(
+    {
+      [expectedHistogramSAPSourceKey]: 1,
+    },
+    {
+      [expectedContentScalar]: { [expectedContentScalarKey]: 1 },
+      [expectedWithAdsScalar]: { [expectedScalarKey]: 1 },
+      [expectedAdClicksScalar]: { [expectedScalarKey]: 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example",
+        tagged: "true",
+        partner_code: "ff",
+        source: expectedScalarSource,
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await cleanupFn();
+
+  Services.fog.testResetFOG();
+}
+
+add_task(async function test_source_webextension_search() {
+  /* global browser */
+  async function background(SEARCH_TERM) {
+    // Search with no tabId
+    browser.search.search({ query: "searchSuggestion", engine: "Example" });
+  }
+
+  let searchExtension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["search", "tabs"],
+    },
+    background,
+    useAddonManager: "temporary",
+  });
+
+  let tab;
+  await track_ad_click(
+    "webextension",
+    "webextension",
+    async () => {
+      let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, null, true);
+
+      await searchExtension.startup();
+
+      return (tab = await tabPromise);
+    },
+    async () => {
+      await searchExtension.unload();
+      BrowserTestUtils.removeTab(tab);
+    }
+  );
+});
+
+add_task(async function test_source_webextension_query() {
+  async function background(SEARCH_TERM) {
+    // Search with no tabId
+    browser.search.query({
+      text: "searchSuggestion",
+      disposition: "NEW_TAB",
+    });
+  }
+
+  let searchExtension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["search", "tabs"],
+    },
+    background,
+    useAddonManager: "temporary",
+  });
+
+  let tab;
+  await track_ad_click(
+    "webextension",
+    "webextension",
+    async () => {
+      let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, null, true);
+
+      await searchExtension.startup();
+
+      return (tab = await tabPromise);
+    },
+    async () => {
+      await searchExtension.unload();
+      BrowserTestUtils.removeTab(tab);
+    }
+  );
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_in_content.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_in_content.js
new file mode 100644
index 0000000000..39270c7e9f
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_in_content.js
@@ -0,0 +1,524 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check SPA in-content interactions (e.g. search box, clicking autosuggest) and
+ * ensures we're correctly unloading / adding listeners to elements, and
+ * registering the right engagements for search submission events that could
+ * change the location of the page.
+ */
+
+"use strict";
+
+add_setup(async function () {
+  await initSinglePageAppTest();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.ipc.processCount.webIsolated", 1]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_content_process_type_search_click_suggestion() {
+  resetTelemetry();
+
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await SinglePageAppUtils.clickSearchboxAndType(tab);
+  await SinglePageAppUtils.clickSuggestion(tab);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 2,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 2,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.SUBMITTED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "follow_on_from_refine_on_incontent_search",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+  await BrowserTestUtils.removeTab(tab);
+});
+
+add_task(
+  async function test_content_process_type_search_click_related_search() {
+    resetTelemetry();
+
+    let tab = await SinglePageAppUtils.createTabAndLoadURL();
+    await SinglePageAppUtils.clickSearchboxAndType(tab);
+    await SinglePageAppUtils.visitRelatedSearch(tab);
+
+    await assertSearchSourcesTelemetry(
+      {},
+      {
+        "browser.search.content.unknown": {
+          "example1:tagged:ff": 2,
+        },
+        "browser.search.withads.unknown": {
+          "example1:tagged": 2,
+        },
+      }
+    );
+
+    assertSERPTelemetry([
+      {
+        impression: {
+          provider: "example1",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        engagements: [
+          {
+            action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+            target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+          },
+          {
+            action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+            target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+          },
+        ],
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+      {
+        impression: {
+          provider: "example1",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+    ]);
+    await BrowserTestUtils.removeTab(tab);
+  }
+);
+
+add_task(async function test_content_process_engagement() {
+  resetTelemetry();
+
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await SinglePageAppUtils.clickSearchbox(tab);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 1,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_content_process_engagement_that_changes_page() {
+  resetTelemetry();
+
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await SinglePageAppUtils.clickSuggestion(tab);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 2,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 2,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.SUBMITTED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "follow_on_from_refine_on_incontent_search",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
+
+// This is to ensure if the user switches to another search page, we unload
+// the listeners, add them back in, and then accurately register the correct
+// number of engagements. The engagement target should also be accurate.
+add_task(
+  async function test_in_page_reload_and_content_process_engagement_that_changes_page() {
+    resetTelemetry();
+
+    let tab = await SinglePageAppUtils.createTabAndLoadURL();
+    await SinglePageAppUtils.visitRelatedSearch(tab);
+    await SinglePageAppUtils.clickSuggestion(tab);
+
+    await assertSearchSourcesTelemetry(
+      {},
+      {
+        "browser.search.content.unknown": {
+          "example1:tagged:ff": 3,
+        },
+        "browser.search.withads.unknown": {
+          "example1:tagged": 3,
+        },
+      }
+    );
+
+    assertSERPTelemetry([
+      {
+        impression: {
+          provider: "example1",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        engagements: [
+          {
+            action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+            target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+          },
+        ],
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+      {
+        impression: {
+          provider: "example1",
+          tagged: "true",
+          partner_code: "ff",
+          source: "unknown",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        engagements: [
+          {
+            action: SearchSERPTelemetryUtils.ACTIONS.SUBMITTED,
+            target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+          },
+        ],
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+      {
+        impression: {
+          provider: "example1",
+          tagged: "true",
+          partner_code: "ff",
+          source: "follow_on_from_refine_on_incontent_search",
+          is_shopping_page: "false",
+          is_private: "false",
+          shopping_tab_displayed: "false",
+        },
+        adImpressions: [
+          {
+            component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+            ads_loaded: "2",
+            ads_visible: "2",
+            ads_hidden: "0",
+          },
+        ],
+      },
+    ]);
+
+    await BrowserTestUtils.removeTab(tab);
+  }
+);
+
+// Clicking on another SERP tab and selecting the searchbox shouldn't cause a
+// new engagement.
+add_task(async function test_unload_listeners_single_tab() {
+  resetTelemetry();
+
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await SinglePageAppUtils.clickImagesTab(tab);
+  await SinglePageAppUtils.clickSearchbox(tab);
+  await SinglePageAppUtils.clickSuggestionOnImagesTab(tab);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 1,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
+
+// Make sure unloading listeners is specific to the tab.
+add_task(async function test_unload_listeners_multi_tab() {
+  resetTelemetry();
+
+  let tab1 = await SinglePageAppUtils.createTabAndLoadURL();
+  let tab2 = await SinglePageAppUtils.createTabAndLoadURL();
+
+  // Listener should no longer be applicable on tab2 because we're switching
+  // to tab2.
+  await SinglePageAppUtils.clickImagesTab(tab2);
+  await SinglePageAppUtils.clickSearchbox(tab2);
+  await SinglePageAppUtils.clickSuggestionOnImagesTab(tab2);
+
+  // Click a searchbox on tab1 to verify the listener is still working.
+  await SinglePageAppUtils.clickSearchbox(tab1);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 2,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 2,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab1);
+  await BrowserTestUtils.removeTab(tab2);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_multi_provider.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_multi_provider.js
new file mode 100644
index 0000000000..1e44957daa
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_multi_provider.js
@@ -0,0 +1,529 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check SPA page loads on two different providers that are both SPAs. A sanity
+ * check to ensure we're categorizing them separately. They differ by having
+ * different top level domains (.com vs .org).
+ */
+
+"use strict";
+
+add_setup(async function () {
+  await initSinglePageAppTest();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.ipc.processCount.webIsolated", 1]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_load_serps_and_click_organic() {
+  resetTelemetry();
+
+  let tabs = await SinglePageAppUtils.createTabsWithDifferentProviders();
+
+  for (let tab of tabs) {
+    await SinglePageAppUtils.clickOrganic(tab);
+  }
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 1,
+        "example2:tagged:ff": 1,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 1,
+        "example2:tagged": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example2",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+    },
+  ]);
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.removeTab(tab);
+  }
+});
+
+add_task(async function test_load_serps_and_click_ads() {
+  resetTelemetry();
+
+  let tabs = await SinglePageAppUtils.createTabsWithDifferentProviders();
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.switchTab(gBrowser, tab);
+    await SinglePageAppUtils.clickAd(tab);
+  }
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 1,
+        "example2:tagged:ff": 1,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 1,
+        "example2:tagged": 1,
+      },
+      "browser.search.adclicks.unknown": {
+        "example1:tagged": 1,
+        "example2:tagged": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example2",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+    },
+  ]);
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.removeTab(tab);
+  }
+});
+
+add_task(async function test_load_serps_and_click_related() {
+  resetTelemetry();
+
+  let tabs = await SinglePageAppUtils.createTabsWithDifferentProviders();
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.switchTab(gBrowser, tab);
+    await SinglePageAppUtils.visitRelatedSearch(tab);
+  }
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 2,
+        "example2:tagged:ff": 2,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 2,
+        "example2:tagged": 2,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example2",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example2",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.removeTab(tab);
+  }
+});
+
+add_task(async function test_load_pages_tabhistory() {
+  resetTelemetry();
+
+  let tabs = await SinglePageAppUtils.createTabsWithDifferentProviders();
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.switchTab(gBrowser, tab);
+    await SinglePageAppUtils.visitRelatedSearch(tab);
+    await SinglePageAppUtils.goBack(tab);
+    await SinglePageAppUtils.goForward(tab);
+  }
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 2,
+        "example2:tagged:ff": 2,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 2,
+        "example2:tagged": 2,
+      },
+      "browser.search.content.tabhistory": {
+        "example1:tagged:ff": 2,
+        "example2:tagged:ff": 2,
+      },
+      "browser.search.withads.tabhistory": {
+        "example1:tagged": 2,
+        "example2:tagged": 2,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+    },
+    {
+      // This is second because it was the second tab created.
+      impression: {
+        provider: "example2",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example2",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example2",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example2",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  for (let tab of tabs) {
+    await BrowserTestUtils.removeTab(tab);
+  }
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_multi_tab.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_multi_tab.js
new file mode 100644
index 0000000000..478a995e97
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_multi_tab.js
@@ -0,0 +1,875 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check SPA page loads on a single provider using multiple tabs.
+ */
+
+"use strict";
+
+// Allow more time for Mac machines so they don't time out in verify mode.
+if (AppConstants.platform == "macosx") {
+  requestLongerTimeout(3);
+}
+
+add_setup(async function () {
+  await initSinglePageAppTest();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.ipc.processCount.webIsolated", 1]],
+  });
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+// Deliberately has actions happening after one another to assert that the
+// different events are recorded properly.
+
+// One issue that can occur is if two SERPs have the same search term, if we
+// try finding the item for the URL, it might match the wrong item.
+// e.g. two tabs search for foobar
+// one tab then searches for barfoo
+// the other tab that had foobar does another search, but instead of referring
+// back to foobar, it looks at barfoo and messes with its state.
+
+// We use switch tabs to avoid `getBoundsWithoutFlushing` not returning the
+// latest visual info, which affects ad visibility counts.
+add_task(async function test_load_serps_and_click_related_searches() {
+  resetTelemetry();
+
+  let tab1 = await SinglePageAppUtils.createTabAndLoadURL();
+  let tab2 = await SinglePageAppUtils.createTabAndLoadURL();
+  let tab3 = await SinglePageAppUtils.createTabAndLoadURL();
+
+  await BrowserTestUtils.switchTab(gBrowser, tab1);
+  await SinglePageAppUtils.visitRelatedSearchWithoutAds(tab1);
+
+  await BrowserTestUtils.switchTab(gBrowser, tab2);
+  await SinglePageAppUtils.visitRelatedSearch(tab2);
+
+  await BrowserTestUtils.switchTab(gBrowser, tab3);
+  await SinglePageAppUtils.visitRelatedSearchWithoutAds(tab3);
+
+  await BrowserTestUtils.switchTab(gBrowser, tab1);
+  await SinglePageAppUtils.visitRelatedSearch(tab1);
+
+  await BrowserTestUtils.switchTab(gBrowser, tab2);
+  await SinglePageAppUtils.visitRelatedSearchWithoutAds(tab2);
+
+  await BrowserTestUtils.switchTab(gBrowser, tab3);
+  await SinglePageAppUtils.visitRelatedSearchWithoutAds(tab3);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 9,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 5,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      // Tab 1 - Visit a SERP, clicks a related search without ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visits a SERP, clicks a related SERP with ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 3 - Visit a SERP, clicks a related SERP without ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 1 - Visits a related SERP without ads, clicks on a related SERP
+      // with ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [],
+    },
+    {
+      // Tab 2 - Visits a related search with ads, clicks a related SERP
+      // without ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 3 - Visit a SERP without ads, clicks a related SERP without ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [],
+    },
+    {
+      // Tab 1 - Visit a related SERP with ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a related SERP without ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [],
+    },
+    {
+      // Tab 3 - Visit a related SERP without ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab1);
+  await BrowserTestUtils.removeTab(tab2);
+  await BrowserTestUtils.removeTab(tab3);
+});
+
+/**
+ * The source of the ad click should match the correct tab.
+ */
+add_task(async function test_different_sources_click_ad() {
+  resetTelemetry();
+
+  let tab1 = await SinglePageAppUtils.createTabAndLoadURL();
+  let tab2 = await SinglePageAppUtils.createTabAndLoadURL();
+
+  await SinglePageAppUtils.visitRelatedSearch(tab2);
+  await SinglePageAppUtils.goBack(tab2);
+  await SinglePageAppUtils.clickAd(tab2);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 3,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 3,
+      },
+      "browser.search.content.tabhistory": {
+        "example1:tagged:ff": 1,
+      },
+      "browser.search.withads.tabhistory": {
+        "example1:tagged": 1,
+      },
+      "browser.search.adclicks.tabhistory": {
+        "example1:tagged": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      // Tab 1 - Visit a SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a SERP, click a related SERP with ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a SERP, click back button.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      // Tab 2 - Visit a SERP, click ad button.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab1);
+  await BrowserTestUtils.removeTab(tab2);
+});
+
+add_task(async function test_different_sources_click_redirect_ad_in_new_tab() {
+  resetTelemetry();
+
+  let tab1 = await SinglePageAppUtils.createTabAndLoadURL();
+  let tab2 = await SinglePageAppUtils.createTabAndLoadURL();
+
+  await SinglePageAppUtils.visitRelatedSearch(tab2);
+  await SinglePageAppUtils.goBack(tab2);
+  let tab3 = await SinglePageAppUtils.clickRedirectAdInNewTab(tab2);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 3,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 3,
+      },
+      "browser.search.content.tabhistory": {
+        "example1:tagged:ff": 1,
+      },
+      "browser.search.withads.tabhistory": {
+        "example1:tagged": 1,
+      },
+      "browser.search.adclicks.tabhistory": {
+        "example1:tagged": 1,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      // Tab 1 - Visit a SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a SERP, click a related SERP with ads.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a SERP, click back button.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      // Tab 2 - Visit a SERP, click ad button.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab1);
+  await BrowserTestUtils.removeTab(tab2);
+  await BrowserTestUtils.removeTab(tab3);
+});
+
+add_task(async function test_update_query_params_after_search() {
+  resetTelemetry();
+
+  let tab1 = await SinglePageAppUtils.createTabAndLoadURL();
+  info("Visit a related search so that the URL has an extra query parameter.");
+  await SinglePageAppUtils.visitRelatedSearch(tab1);
+
+  let tab2 = await SinglePageAppUtils.createTabAndLoadURL();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 3,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 3,
+      },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      // Tab 1 - Visit a SERP, click on a related SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 1 - Visit a related SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a SERP, click on an ad.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab1);
+  await BrowserTestUtils.removeTab(tab2);
+});
+
+add_task(async function test_update_query_params() {
+  resetTelemetry();
+
+  // Deliberately use a different search term for the first example, because
+  // if both tabs have the same search term and a link is clicked that opens a
+  // new window, we currently can't recover the exact browser.
+  let tab1 = await SinglePageAppUtils.createTabAndSearch("foo bar");
+  info("Visit a related search so that the URL has an extra query parameter.");
+  await SinglePageAppUtils.visitRelatedSearch(tab1);
+
+  let tab2 = await SinglePageAppUtils.createTabAndLoadURL();
+  let newWindow = await SinglePageAppUtils.clickRedirectAdInNewWindow(tab2);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 3,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 3,
+      },
+      "browser.search.adclicks.unknown": { "example1:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      // Tab 1 - Visit a SERP, clicked a related SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 1 - Visit a related SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a SERP, click ad opening in a new window.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.closeWindow(newWindow);
+  await BrowserTestUtils.removeTab(tab1);
+  await BrowserTestUtils.removeTab(tab2);
+});
+
+add_task(async function test_update_query_params_multiple_related() {
+  resetTelemetry();
+
+  let tab1 = await SinglePageAppUtils.createTabAndSearch("foo bar");
+  info("Visit a related search so that the URL has an extra query parameter.");
+  await SinglePageAppUtils.visitRelatedSearch(tab1);
+
+  let tab2 = await SinglePageAppUtils.createTabAndLoadURL();
+  info("Visit a related search so that the URL has an extra query parameter.");
+  await SinglePageAppUtils.visitRelatedSearch(tab2);
+
+  let newWindow = await SinglePageAppUtils.clickRedirectAdInNewWindow(tab2);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": {
+        "example1:tagged:ff": 4,
+      },
+      "browser.search.withads.unknown": {
+        "example1:tagged": 4,
+      },
+      "browser.search.adclicks.unknown": { "example1:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      // Tab 1 - Visit a SERP, clicked a related SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 1 - Visit a related SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a SERP, clicked a related SERP.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      // Tab 2 - Visit a related SERP. Click on ad that opens in a new window.
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.closeWindow(newWindow);
+  await BrowserTestUtils.removeTab(tab1);
+  await BrowserTestUtils.removeTab(tab2);
+});
diff --git a/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_single_tab.js b/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_single_tab.js
new file mode 100644
index 0000000000..4f85c6cfa1
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/browser_search_telemetry_spa_single_tab.js
@@ -0,0 +1,661 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests check on SPA page loads in a single tab.
+ * They also ensure the SinglePageAppUtils method work as expected.
+ */
+
+"use strict";
+
+add_setup(async function () {
+  await initSinglePageAppTest();
+
+  registerCleanupFunction(async () => {
+    SearchSERPTelemetry.overrideSearchTelemetryForTests();
+    resetTelemetry();
+  });
+});
+
+add_task(async function test_load_serp() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example1:tagged": 1 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_and_push_unrelated_state() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  let searchParams = new URL(tab.linkedBrowser.currentURI.spec).searchParams;
+
+  Assert.equal(
+    searchParams.get("foobar"),
+    null,
+    "Query param value for: foobar"
+  );
+
+  await SinglePageAppUtils.pushUnrelatedState(tab, {
+    key: "foobar",
+    value: "baz",
+  });
+  searchParams = new URL(tab.linkedBrowser.currentURI.spec).searchParams;
+  Assert.equal(
+    searchParams.get("foobar"),
+    "baz",
+    "Query param value for: foobar"
+  );
+
+  // If the SERP adds query parameter unrelated to the search query or the
+  // query param matching the default results page, we shouldn't record another
+  // SERP load.
+  /* eslint-disable-next-line mozilla/no-arbitrary-setTimeout */
+  await new Promise(resolve => setTimeout(resolve, 1000));
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example1:tagged": 1 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_and_load_non_serp_tab() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+
+  await SinglePageAppUtils.clickImagesTab(tab);
+  // If clicking another tab in a SPA, we shouldn't record another SERP load.
+  /* eslint-disable-next-line mozilla/no-arbitrary-setTimeout */
+  await new Promise(resolve => setTimeout(resolve, 1000));
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example1:tagged": 1 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_and_click_ad() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example1:tagged": 1 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await SinglePageAppUtils.clickAd(tab);
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example1:tagged": 1 },
+      "browser.search.adclicks.unknown": { "example1:tagged": 1 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_and_click_redirect_ad() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+
+  await SinglePageAppUtils.clickRedirectAd(tab);
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example1:tagged": 1 },
+      "browser.search.adclicks.unknown": { "example1:tagged": 1 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+  await BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_and_click_redirect_ad_in_new_tab() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+
+  let redirectedTab = await SinglePageAppUtils.clickRedirectAdInNewTab(tab);
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example1:tagged": 1 },
+      "browser.search.adclicks.unknown": { "example1:tagged": 1 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+  await BrowserTestUtils.removeTab(redirectedTab);
+});
+
+add_task(async function test_load_serp_click_a_related_search() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await SinglePageAppUtils.visitRelatedSearch(tab);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 2 },
+      "browser.search.withads.unknown": { "example1:tagged": 2 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_click_a_related_search_click_ad() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await SinglePageAppUtils.visitRelatedSearch(tab);
+  await SinglePageAppUtils.clickAd(tab);
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 2 },
+      "browser.search.withads.unknown": { "example1:tagged": 2 },
+      "browser.search.adclicks.unknown": { "example1:tagged": 1 },
+    }
+  );
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_click_non_serp_tab_click_all() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await SinglePageAppUtils.clickImagesTab(tab);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 1 },
+      "browser.search.withads.unknown": { "example1:tagged": 1 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  info("Click All tab to return to a SERP.");
+  await SinglePageAppUtils.clickAllTab(tab);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 2 },
+      "browser.search.withads.unknown": { "example1:tagged": 2 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_load_serp_and_use_back_and_forward() {
+  resetTelemetry();
+  let tab = await SinglePageAppUtils.createTabAndLoadURL();
+  await SinglePageAppUtils.visitRelatedSearch(tab);
+  await SinglePageAppUtils.goBack(tab);
+  await SinglePageAppUtils.goForward(tab);
+
+  await assertSearchSourcesTelemetry(
+    {},
+    {
+      "browser.search.content.unknown": { "example1:tagged:ff": 2 },
+      "browser.search.withads.unknown": { "example1:tagged": 2 },
+      "browser.search.content.tabhistory": { "example1:tagged:ff": 2 },
+      "browser.search.withads.tabhistory": { "example1:tagged": 2 },
+    }
+  );
+
+  assertSERPTelemetry([
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      engagements: [
+        {
+          action: SearchSERPTelemetryUtils.ACTIONS.CLICKED,
+          target: SearchSERPTelemetryUtils.COMPONENTS.NON_ADS_LINK,
+        },
+      ],
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "unknown",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+      abandonment: {
+        reason: SearchSERPTelemetryUtils.ABANDONMENTS.NAVIGATION,
+      },
+    },
+    {
+      impression: {
+        provider: "example1",
+        tagged: "true",
+        partner_code: "ff",
+        source: "tabhistory",
+        is_shopping_page: "false",
+        is_private: "false",
+        shopping_tab_displayed: "false",
+      },
+      adImpressions: [
+        {
+          component: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+          ads_loaded: "2",
+          ads_visible: "2",
+          ads_hidden: "0",
+        },
+      ],
+    },
+  ]);
+
+  await BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/search/test/browser/telemetry/cacheable.html b/browser/components/search/test/browser/telemetry/cacheable.html
new file mode 100644
index 0000000000..8aac4a0f16
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/cacheable.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Cacheable Page</title>
+</head>
+<body>
+  <p>This page is cacheable.</p>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/cacheable.html^headers^ b/browser/components/search/test/browser/telemetry/cacheable.html^headers^
new file mode 100644
index 0000000000..6f34caa8f2
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/cacheable.html^headers^
@@ -0,0 +1 @@
+Cache-Control: max-age=3600
diff --git a/browser/components/search/test/browser/telemetry/domain_category_mappings.json b/browser/components/search/test/browser/telemetry/domain_category_mappings.json
new file mode 100644
index 0000000000..2f8d0d2af2
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/domain_category_mappings.json
@@ -0,0 +1,8 @@
+{
+  "DqNorjpE3CBY9OZh0wf1uA==": [2, 90],
+  "kpuib0kvhtSp1moICEmGWg==": [2, 95],
+  "+5WbbjV3Nmxp0mBZODcJWg==": [2, 78, 4, 10],
+  "OIHlWZ/yMyTHHuY78AV9VQ==": [3, 90],
+  "r1hDZinn+oNrQjabn8IB9w==": [4, 90],
+  "AtlIam7nqWvzFzTGkYI01w==": [4, 90]
+}
diff --git a/browser/components/search/test/browser/telemetry/head-spa.js b/browser/components/search/test/browser/telemetry/head-spa.js
new file mode 100644
index 0000000000..2718dbb9ff
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/head-spa.js
@@ -0,0 +1,259 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Helpers to simulate the use of a single page application.
+ */
+
+/* import-globals-from head.js */
+
+/**
+ * Used to control the SPA SERP.
+ */
+class SinglePageAppUtils {
+  static async clickAd(tab) {
+    info("Clicking ad.");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#ad",
+      {},
+      tab.linkedBrowser
+    );
+    await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  }
+
+  static async clickAllTab(tab) {
+    info("Click All tab to return to a SERP.");
+    let adsPromise = TestUtils.topicObserved(
+      "reported-page-with-ad-impressions"
+    );
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#all",
+      {},
+      tab.linkedBrowser
+    );
+    await adsPromise;
+  }
+
+  static async clickImagesTab(tab) {
+    info("Click images tab.");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#images",
+      {},
+      tab.linkedBrowser
+    );
+    info("Wait a brief amount of time.");
+    // There's no obvious way to know we shouldn't expect a SERP impression, so
+    // we wait roughly the amount of time it would take for extracting ads to
+    // take.
+    await promiseWaitForAdLinkCheck();
+  }
+
+  static async clickOrganic(tab) {
+    info("Clicking organic result.");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#organic",
+      {},
+      tab.linkedBrowser
+    );
+    await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  }
+
+  static async clickRedirectAd(tab) {
+    info("Clicking redirect ad.");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#ad-redirect",
+      {},
+      tab.linkedBrowser
+    );
+    await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  }
+
+  static async clickRedirectAdInNewTab(tab) {
+    info("Clicking redirect ad in new tab.");
+    let tabPromise = BrowserTestUtils.waitForNewTab(tab.ownerGlobal.gBrowser);
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#ad-redirect",
+      { button: 1 },
+      tab.linkedBrowser
+    );
+    let redirectedTab = await tabPromise;
+    return redirectedTab;
+  }
+
+  static async clickRedirectAdInNewWindow(tab) {
+    let contextMenu = tab.linkedBrowser.ownerGlobal.document.getElementById(
+      "contentAreaContextMenu"
+    );
+    let contextMenuPromise = BrowserTestUtils.waitForEvent(
+      contextMenu,
+      "popupshown"
+    );
+    info("Open context menu.");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#ad-redirect",
+      { type: "contextmenu", button: 2 },
+      tab.linkedBrowser
+    );
+    await contextMenuPromise;
+
+    let newWindowPromise = BrowserTestUtils.waitForNewWindow({
+      url: "https://example.com/hello_world",
+    });
+    let openLinkInNewWindow = contextMenu.querySelector("#context-openlink");
+    info("Click on Open Link in New Window");
+    contextMenu.activateItem(openLinkInNewWindow);
+    return await newWindowPromise;
+  }
+
+  static async clickSearchbox(tab) {
+    info("Clicking searchbox.");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#searchbox",
+      {},
+      tab.linkedBrowser
+    );
+    await waitForIdle();
+  }
+
+  static async clickSearchboxAndType(tab, str = "hello world") {
+    await SinglePageAppUtils.clickSearchbox(tab);
+    info(`Type ${str} in searchbox.`);
+    for (let char of str) {
+      await BrowserTestUtils.sendChar(char, tab.linkedBrowser);
+    }
+    await waitForIdle();
+  }
+
+  static async clickSuggestion(tab) {
+    info("Clicking the first suggestion.");
+    let adsPromise = TestUtils.topicObserved(
+      "reported-page-with-ad-impressions"
+    );
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#searchbox-suggestions div",
+      {},
+      tab.linkedBrowser
+    );
+    await adsPromise;
+  }
+
+  static async clickSuggestionOnImagesTab(tab) {
+    info("Clicking the first suggestion on images tab.");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#searchbox-suggestions div",
+      {},
+      tab.linkedBrowser
+    );
+    await promiseWaitForAdLinkCheck();
+  }
+
+  static async createTabAndLoadURL(
+    url = new URL(getSERPUrl("searchTelemetrySinglePageApp.html"))
+  ) {
+    info("Load SERP.");
+    let adsPromise = TestUtils.topicObserved(
+      "reported-page-with-ad-impressions"
+    );
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url.href);
+    await adsPromise;
+    return tab;
+  }
+
+  static async createTabAndSearch(searchTerm = "test") {
+    info("Load SERP.");
+    let adsPromise = TestUtils.topicObserved(
+      "reported-page-with-ad-impressions"
+    );
+    let url = new URL(getSERPUrl("searchTelemetrySinglePageApp.html"));
+    url.searchParams.set("s", searchTerm);
+    let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url.href);
+    await adsPromise;
+    return tab;
+  }
+
+  static async createTabsWithDifferentProviders() {
+    let url1 = new URL(getSERPUrl("searchTelemetrySinglePageApp.html"));
+    let tab1 = await SinglePageAppUtils.createTabAndLoadURL(url1);
+
+    let url2 = new URL(
+      getAlternateSERPUrl("searchTelemetrySinglePageApp.html")
+    );
+    let tab2 = await SinglePageAppUtils.createTabAndLoadURL(url2);
+
+    return [tab1, tab2];
+  }
+
+  static async goBack(tab) {
+    info("Go back to SERP ads.");
+    let promise = TestUtils.topicObserved("reported-page-with-ad-impressions");
+    tab.linkedBrowser.goBack();
+    await promise;
+  }
+
+  static async goBackToPageWithoutAds(tab) {
+    info("Go back to SERP without ads.");
+    tab.linkedBrowser.goBack();
+    await new Promise(resolve => setTimeout(resolve, 200));
+  }
+
+  static async goForward(tab) {
+    info("Go forward to SERP ads.");
+    let promise = TestUtils.topicObserved("reported-page-with-ad-impressions");
+    tab.linkedBrowser.goForward();
+    await promise;
+  }
+
+  static async goForwardToPageWithoutAds(tab) {
+    info("Go forward to SERP without ads.");
+    tab.linkedBrowser.goForward();
+    await new Promise(resolve => setTimeout(resolve, 200));
+  }
+
+  static async pushUnrelatedState(tab, { key = "foobar", value = "baz" } = {}) {
+    info(`Pushing ${key}=${value} to the list of query parameters in URL.`);
+    await SpecialPowers.spawn(
+      tab.linkedBrowser,
+      [key, value],
+      async function (contentKey, contentValue) {
+        let url = new URL(content.window.location.href);
+        url.searchParams.set(contentKey, contentValue);
+        content.history.pushState({}, "", url);
+      }
+    );
+  }
+
+  static async visitRelatedSearch(tab) {
+    let adsPromise = TestUtils.topicObserved(
+      "reported-page-with-ad-impressions"
+    );
+    info("Clicking a related search with an ad.");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#related-search",
+      {},
+      tab.linkedBrowser
+    );
+    await adsPromise;
+  }
+
+  static async visitRelatedSearchWithoutAds(tab) {
+    info("Clicking a related search without ads.");
+    let adsPromise = TestUtils.topicObserved(
+      "reported-page-with-ad-impressions"
+    );
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#related-search-without-ads",
+      {},
+      tab.linkedBrowser
+    );
+    await adsPromise;
+  }
+}
+
+function getAlternateSERPUrl(page, organic = false) {
+  let url =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.com"
+    ) + page;
+  return `${url}?s=test${organic ? "" : "&abc=ff"}`;
+}
diff --git a/browser/components/search/test/browser/telemetry/head.js b/browser/components/search/test/browser/telemetry/head.js
new file mode 100644
index 0000000000..416451e400
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/head.js
@@ -0,0 +1,621 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  ADLINK_CHECK_TIMEOUT_MS:
+    "resource:///actors/SearchSERPTelemetryChild.sys.mjs",
+  CustomizableUITestUtils:
+    "resource://testing-common/CustomizableUITestUtils.sys.mjs",
+  Region: "resource://gre/modules/Region.sys.mjs",
+  RemoteSettings: "resource://services-settings/remote-settings.sys.mjs",
+  SEARCH_TELEMETRY_SHARED: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPTelemetry: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPTelemetryUtils: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchTestUtils: "resource://testing-common/SearchTestUtils.sys.mjs",
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+  SERPCategorizationRecorder: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  sinon: "resource://testing-common/Sinon.sys.mjs",
+  SPA_ADLINK_CHECK_TIMEOUT_MS:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  TELEMETRY_CATEGORIZATION_KEY:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  TelemetryTestUtils: "resource://testing-common/TelemetryTestUtils.sys.mjs",
+});
+
+ChromeUtils.defineLazyGetter(this, "UrlbarTestUtils", () => {
+  const { UrlbarTestUtils: module } = ChromeUtils.importESModule(
+    "resource://testing-common/UrlbarTestUtils.sys.mjs"
+  );
+  module.init(this);
+  return module;
+});
+
+ChromeUtils.defineLazyGetter(this, "searchCounts", () => {
+  return Services.telemetry.getKeyedHistogramById("SEARCH_COUNTS");
+});
+
+ChromeUtils.defineLazyGetter(this, "SEARCH_AD_CLICK_SCALARS", () => {
+  const sources = [
+    ...BrowserSearchTelemetry.KNOWN_SEARCH_SOURCES.values(),
+    "unknown",
+  ];
+  return [
+    ...sources.map(v => `browser.search.withads.${v}`),
+    ...sources.map(v => `browser.search.adclicks.${v}`),
+  ];
+});
+
+// For use with categorization.
+const APP_MAJOR_VERSION = parseInt(Services.appinfo.version).toString();
+const CHANNEL = SearchUtils.MODIFIED_APP_CHANNEL;
+const REGION = Region.home;
+
+let gCUITestUtils = new CustomizableUITestUtils(window);
+
+SearchTestUtils.init(this);
+
+const UUID_REGEX =
+  /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
+
+// sharedData messages are only passed to the child on idle. Therefore
+// we wait for a few idles to try and ensure the messages have been able
+// to be passed across and handled.
+async function waitForIdle() {
+  for (let i = 0; i < 10; i++) {
+    await new Promise(resolve => Services.tm.idleDispatchToMainThread(resolve));
+  }
+}
+
+function getPageUrl(useAdPage = false) {
+  let page = useAdPage ? "searchTelemetryAd.html" : "searchTelemetry.html";
+  return `https://example.org/browser/browser/components/search/test/browser/telemetry/${page}`;
+}
+
+function getSERPUrl(page, organic = false) {
+  let url =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.org"
+    ) + page;
+  return `${url}?s=test${organic ? "" : "&abc=ff"}`;
+}
+
+async function typeInSearchField(browser, text, fieldName) {
+  await SpecialPowers.spawn(
+    browser,
+    [[fieldName, text]],
+    async function ([contentFieldName, contentText]) {
+      // Put the focus on the search box.
+      let searchInput = content.document.getElementById(contentFieldName);
+      searchInput.focus();
+      searchInput.value = contentText;
+    }
+  );
+}
+
+async function searchInSearchbar(inputText, win = window) {
+  await new Promise(r => waitForFocus(r, win));
+  let sb = win.BrowserSearch.searchBar;
+  // Write the search query in the searchbar.
+  sb.focus();
+  sb.value = inputText;
+  sb.textbox.controller.startSearch(inputText);
+  // Wait for the popup to show.
+  await BrowserTestUtils.waitForEvent(sb.textbox.popup, "popupshown");
+  // And then for the search to complete.
+  await TestUtils.waitForCondition(
+    () =>
+      sb.textbox.controller.searchStatus >=
+      Ci.nsIAutoCompleteController.STATUS_COMPLETE_NO_MATCH,
+    "The search in the searchbar must complete."
+  );
+  return sb.textbox.popup;
+}
+
+// Ad links are processed after a small delay. We need to allow tests to wait
+// for that before checking telemetry, otherwise the received values may be
+// too small in some cases.
+function promiseWaitForAdLinkCheck() {
+  return new Promise(resolve =>
+    /* eslint-disable-next-line mozilla/no-arbitrary-setTimeout */
+    setTimeout(resolve, ADLINK_CHECK_TIMEOUT_MS)
+  );
+}
+
+async function assertSearchSourcesTelemetry(
+  expectedHistograms,
+  expectedScalars
+) {
+  let histSnapshot = {};
+  let scalars = {};
+
+  // This used to rely on the implied 100ms initial timer of
+  // TestUtils.waitForCondition. See bug 1515466.
+  await new Promise(resolve => setTimeout(resolve, 100));
+
+  await TestUtils.waitForCondition(() => {
+    histSnapshot = searchCounts.snapshot();
+    return (
+      Object.getOwnPropertyNames(histSnapshot).length ==
+      Object.getOwnPropertyNames(expectedHistograms).length
+    );
+  }, "should have the correct number of histograms");
+
+  if (Object.entries(expectedScalars).length) {
+    await TestUtils.waitForCondition(() => {
+      scalars =
+        Services.telemetry.getSnapshotForKeyedScalars("main", false).parent ||
+        {};
+      return Object.getOwnPropertyNames(expectedScalars).every(
+        scalar => scalar in scalars
+      );
+    }, "should have the expected keyed scalars");
+  }
+
+  Assert.equal(
+    Object.getOwnPropertyNames(histSnapshot).length,
+    Object.getOwnPropertyNames(expectedHistograms).length,
+    "Should only have one key"
+  );
+
+  for (let [key, value] of Object.entries(expectedHistograms)) {
+    Assert.ok(
+      key in histSnapshot,
+      `Histogram should have the expected key: ${key}`
+    );
+    Assert.equal(
+      histSnapshot[key].sum,
+      value,
+      `Should have counted the correct number of visits for ${key}`
+    );
+  }
+
+  for (let [name, value] of Object.entries(expectedScalars)) {
+    Assert.ok(name in scalars, `Scalar ${name} should have been added.`);
+    Assert.deepEqual(
+      scalars[name],
+      value,
+      `Should have counted the correct number of visits for ${name}`
+    );
+  }
+
+  for (let name of SEARCH_AD_CLICK_SCALARS) {
+    Assert.equal(
+      name in scalars,
+      name in expectedScalars,
+      `Should have matched ${name} in scalars and expectedScalars`
+    );
+  }
+}
+
+function resetTelemetry() {
+  // TODO Bug 1868476: Replace when we're using Glean telemetry.
+  fakeTelemetryStorage = [];
+  searchCounts.clear();
+  Services.telemetry.clearScalars();
+  Services.fog.testResetFOG();
+}
+
+/**
+ * First checks that we get the correct number of recorded Glean impression events
+ * and the recorded Glean impression events have the correct keys and values.
+ *
+ * Then it checks that there are the the correct engagement events associated with the
+ * impression events.
+ *
+ * @param {Array} expectedEvents The expected impression events whose keys and
+ * values we use to validate the recorded Glean impression events.
+ */
+function assertSERPTelemetry(expectedEvents) {
+  // A single test might run assertImpressionEvents more than once
+  // so the Set needs to be cleared or else the impression event
+  // check will throw.
+  const impressionIdsSet = new Set();
+
+  let recordedImpressions = Glean.serp.impression.testGetValue() ?? [];
+
+  Assert.equal(
+    recordedImpressions.length,
+    expectedEvents.length,
+    "Number of impressions matches expected events."
+  );
+
+  // Assert the impression events.
+  for (let [idx, expectedEvent] of expectedEvents.entries()) {
+    let impressionId = recordedImpressions[idx].extra.impression_id;
+    Assert.ok(
+      UUID_REGEX.test(impressionId),
+      "Impression has an impression_id with a valid UUID."
+    );
+
+    Assert.ok(
+      !impressionIdsSet.has(impressionId),
+      "Impression has a unique impression_id."
+    );
+
+    impressionIdsSet.add(impressionId);
+
+    // If we want to use deepEqual checks, we have to add the impressionId
+    // to each impression since they are randomly generated at runtime.
+    expectedEvent.impression.impression_id = impressionId;
+
+    Assert.deepEqual(
+      recordedImpressions[idx].extra,
+      expectedEvent.impression,
+      "Matching SERP impression values."
+    );
+
+    // Once the impression check is sufficient, add the impression_id to
+    // each of the expected engagements, ad impressions, and abandonments for
+    // deep equal checks.
+    if (expectedEvent.engagements) {
+      for (let expectedEngagment of expectedEvent.engagements) {
+        expectedEngagment.impression_id = impressionId;
+      }
+    }
+    if (expectedEvent.adImpressions) {
+      for (let adImpression of expectedEvent.adImpressions) {
+        adImpression.impression_id = impressionId;
+      }
+    }
+    if (expectedEvent.abandonment) {
+      expectedEvent.abandonment.impression_id = impressionId;
+    }
+  }
+
+  // Group engagement events into separate array fetchable by their
+  // impression_id.
+  let recordedEngagements = Glean.serp.engagement.testGetValue() ?? [];
+  let idToEngagements = new Map();
+  let totalExpectedEngagements = 0;
+
+  for (let recordedEngagement of recordedEngagements) {
+    let impressionId = recordedEngagement.extra.impression_id;
+    Assert.ok(impressionId, "Engagement event has impression_id.");
+
+    let arr = idToEngagements.get(impressionId) ?? [];
+    arr.push(recordedEngagement.extra);
+
+    idToEngagements.set(impressionId, arr);
+  }
+
+  // Assert the engagement events.
+  for (let expectedEvent of expectedEvents) {
+    let impressionId = expectedEvent.impression.impression_id;
+    let expectedEngagements = expectedEvent.engagements;
+    if (expectedEngagements) {
+      let recorded = idToEngagements.get(impressionId);
+      Assert.deepEqual(
+        recorded,
+        expectedEngagements,
+        "Matching engagement value."
+      );
+      totalExpectedEngagements += expectedEngagements.length;
+    }
+  }
+
+  Assert.equal(
+    recordedEngagements.length,
+    totalExpectedEngagements,
+    "Number of engagements"
+  );
+
+  let recordedAdImpressions = Glean.serp.adImpression.testGetValue() ?? [];
+  let idToAdImpressions = new Map();
+  let totalExpectedAdImpressions = 0;
+
+  // The list of ad impressions are contained in a flat list. Separate them
+  // into arrays organized by impressionId to make it easier to determine if
+  // the page load that matches the expected ads on the page.
+  for (let recordedAdImpression of recordedAdImpressions) {
+    let impressionId = recordedAdImpression.extra.impression_id;
+    Assert.ok(impressionId, "Ad impression has impression_id");
+
+    let arr = idToAdImpressions.get(impressionId) ?? [];
+    arr.push(recordedAdImpression.extra);
+    idToAdImpressions.set(impressionId, arr);
+  }
+
+  for (let expectedEvent of expectedEvents) {
+    let impressionId = expectedEvent.impression.impression_id;
+    let expectedAdImpressions = expectedEvent.adImpressions ?? [];
+    if (expectedAdImpressions.length) {
+      let recorded = idToAdImpressions.get(impressionId) ?? {};
+      Assert.deepEqual(
+        recorded,
+        expectedAdImpressions,
+        "Matching ad impression value."
+      );
+    }
+    totalExpectedAdImpressions += expectedAdImpressions.length;
+  }
+
+  Assert.equal(
+    recordedAdImpressions.length,
+    totalExpectedAdImpressions,
+    "Recorded and expected ad impression counts match."
+  );
+
+  // Assert abandonment events.
+  let recordedAbandonments = Glean.serp.abandonment.testGetValue() ?? [];
+  let idTorecordedAbandonments = new Map();
+  let totalExpectedrecordedAbandonments = 0;
+
+  for (let recordedAbandonment of recordedAbandonments) {
+    let impressionId = recordedAbandonment.extra.impression_id;
+    Assert.ok(impressionId, "Abandonment event has an impression_id.");
+    idTorecordedAbandonments.set(impressionId, recordedAbandonment.extra);
+  }
+
+  for (let expectedEvent of expectedEvents) {
+    let impressionId = expectedEvent.impression.impression_id;
+    let expectedAbandonment = expectedEvent.abandonment;
+    if (expectedAbandonment) {
+      let recorded = idTorecordedAbandonments.get(impressionId);
+      Assert.deepEqual(
+        recorded,
+        expectedAbandonment,
+        "Matching abandonment value."
+      );
+    }
+    totalExpectedrecordedAbandonments += expectedAbandonment ? 1 : 0;
+  }
+
+  Assert.equal(
+    recordedAbandonments.length,
+    totalExpectedrecordedAbandonments,
+    "Recorded and expected abandonment counts match."
+  );
+}
+
+// TODO Bug 1868476: Replace when we're using Glean telemetry.
+let categorizationSandbox;
+let fakeTelemetryStorage = [];
+add_setup(function () {
+  categorizationSandbox = sinon.createSandbox();
+  categorizationSandbox
+    .stub(SERPCategorizationRecorder, "recordCategorizationTelemetry")
+    .callsFake(input => {
+      fakeTelemetryStorage.push(input);
+    });
+
+  registerCleanupFunction(() => {
+    categorizationSandbox.restore();
+    fakeTelemetryStorage = [];
+  });
+});
+
+function assertCategorizationValues(expectedResults) {
+  // TODO Bug 1868476: Replace with calls to Glean telemetry.
+  let actualResults = [...fakeTelemetryStorage];
+
+  Assert.equal(
+    expectedResults.length,
+    actualResults.length,
+    "Should have the correct number of categorization impressions."
+  );
+
+  if (!expectedResults.length) {
+    return;
+  }
+
+  // We use keys in the result vs. Assert.deepEqual to make it easier to
+  // identify exact discrepancies in comparisons, because it can be tedious to
+  // parse a giant list of values.
+  let keys = new Set();
+  for (let expected of expectedResults) {
+    for (let key in expected) {
+      keys.add(key);
+    }
+  }
+  for (let actual of actualResults) {
+    for (let key in actual) {
+      keys.add(key);
+    }
+  }
+  keys = Array.from(keys);
+
+  for (let index = 0; index < expectedResults.length; ++index) {
+    info(`Checking categorization at index: ${index}`);
+    let expected = expectedResults[index];
+    let actual = actualResults[index];
+    for (let key of keys) {
+      // TODO Bug 1868476: This conversion to strings is to mimic Glean
+      // converting all values into strings. Once we receive real values from
+      // Glean, it can be removed.
+      if (actual[key] != null && typeof actual[key] !== "string") {
+        actual[key] = actual[key].toString();
+      }
+      Assert.equal(
+        actual[key],
+        expected[key],
+        `Actual and expected values for ${key} should match.`
+      );
+    }
+  }
+}
+
+function waitForPageWithAdImpressions() {
+  return TestUtils.topicObserved("reported-page-with-ad-impressions");
+}
+
+function waitForPageWithCategorizedDomains() {
+  return TestUtils.topicObserved("reported-page-with-categorized-domains");
+}
+
+function waitForSingleCategorizedEvent() {
+  return TestUtils.topicObserved("recorded-single-categorization-event");
+}
+
+function waitForAllCategorizedEvents() {
+  return TestUtils.topicObserved("recorded-all-categorization-events");
+}
+
+function waitForDomainToCategoriesUpdate() {
+  return TestUtils.topicObserved("domain-to-categories-map-update-complete");
+}
+
+registerCleanupFunction(async () => {
+  await PlacesUtils.history.clear();
+});
+
+async function mockRecordWithAttachment({ id, version, filename }) {
+  // Get the bytes of the file for the hash and size for attachment metadata.
+  let data = await IOUtils.readUTF8(getTestFilePath(filename));
+  let buffer = new TextEncoder().encode(data).buffer;
+  let stream = Cc["@mozilla.org/io/arraybuffer-input-stream;1"].createInstance(
+    Ci.nsIArrayBufferInputStream
+  );
+  stream.setData(buffer, 0, buffer.byteLength);
+
+  // Generate a hash.
+  let hasher = Cc["@mozilla.org/security/hash;1"].createInstance(
+    Ci.nsICryptoHash
+  );
+  hasher.init(Ci.nsICryptoHash.SHA256);
+  hasher.updateFromStream(stream, -1);
+  let hash = hasher.finish(false);
+  hash = Array.from(hash, (_, i) =>
+    ("0" + hash.charCodeAt(i).toString(16)).slice(-2)
+  ).join("");
+
+  let record = {
+    id,
+    version,
+    attachment: {
+      hash,
+      location: `main-workspace/search-categorization/${filename}`,
+      filename,
+      size: buffer.byteLength,
+      mimetype: "application/json",
+    },
+  };
+
+  let attachment = {
+    record,
+    blob: new Blob([buffer]),
+  };
+
+  return { record, attachment };
+}
+
+async function resetCategorizationCollection(record) {
+  const client = RemoteSettings(TELEMETRY_CATEGORIZATION_KEY);
+  await client.attachments.cacheImpl.delete(record.id);
+  await client.db.clear();
+  await client.db.importChanges({}, Date.now());
+}
+
+async function insertRecordIntoCollection() {
+  const client = RemoteSettings(TELEMETRY_CATEGORIZATION_KEY);
+  const db = client.db;
+
+  await db.clear();
+  let { record, attachment } = await mockRecordWithAttachment({
+    id: "example_id",
+    version: 1,
+    filename: "domain_category_mappings.json",
+  });
+  await db.create(record);
+  await client.attachments.cacheImpl.set(record.id, attachment);
+  await db.importChanges({}, Date.now());
+
+  return { record, attachment };
+}
+
+async function insertRecordIntoCollectionAndSync() {
+  let { record } = await insertRecordIntoCollection();
+
+  registerCleanupFunction(async () => {
+    await resetCategorizationCollection(record);
+  });
+
+  await syncCollection(record);
+}
+
+async function syncCollection(record) {
+  let arrayWithRecord = record ? [record] : [];
+  await RemoteSettings(TELEMETRY_CATEGORIZATION_KEY).emit("sync", {
+    data: {
+      current: arrayWithRecord,
+      created: arrayWithRecord,
+      updated: [],
+      deleted: [],
+    },
+  });
+}
+
+async function initSinglePageAppTest() {
+  /* import-globals-from head-spa.js */
+  Services.scriptloader.loadSubScript(
+    "chrome://mochitests/content/browser/browser/components/search/test/browser/telemetry/head-spa.js",
+    this
+  );
+
+  const BASE_PROVIDER = {
+    telemetryId: "example1",
+    searchPageRegexp:
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetrySinglePageApp/,
+    queryParamNames: ["s"],
+    codeParamName: "abc",
+    taggedCodes: ["ff"],
+    adServerAttributes: ["mozAttr"],
+    extraAdServersRegexps: [
+      /^https:\/\/example\.com\/ad/,
+      /^https:\/\/example.org\/browser\/browser\/components\/search\/test\/browser\/telemetry\/redirect_ad/,
+    ],
+    components: [
+      {
+        included: {
+          parent: {
+            selector: "#searchbox-container",
+          },
+          related: {
+            selector: "#searchbox-suggestions",
+          },
+          children: [
+            {
+              selector: "#searchbox",
+            },
+          ],
+        },
+        topDown: true,
+        type: SearchSERPTelemetryUtils.COMPONENTS.INCONTENT_SEARCHBOX,
+      },
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+    isSPA: true,
+    defaultPageQueryParam: {
+      key: "page",
+      value: "web",
+    },
+  };
+
+  const SPA_PROVIDER_INFO = [
+    BASE_PROVIDER,
+    {
+      ...BASE_PROVIDER,
+      telemetryId: "example2",
+      // Use example.com instead of example.org so that we have two providers
+      // with different TLD's and won't share the same web process.
+      searchPageRegexp:
+        /^https:\/\/example.com\/browser\/browser\/components\/search\/test\/browser\/telemetry\/searchTelemetrySinglePageApp/,
+    },
+  ];
+
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(SPA_PROVIDER_INFO);
+  await waitForIdle();
+
+  // Shorten delay to avoid potential TV timeouts.
+  Services.ppmm.sharedData.set(SEARCH_TELEMETRY_SHARED.SPA_LOAD_TIMEOUT, 100);
+
+  registerCleanupFunction(function () {
+    Services.ppmm.sharedData.set(
+      SEARCH_TELEMETRY_SHARED.SPA_LOAD_TIMEOUT,
+      SPA_ADLINK_CHECK_TIMEOUT_MS
+    );
+  });
+}
diff --git a/browser/components/search/test/browser/telemetry/redirect_ad.sjs b/browser/components/search/test/browser/telemetry/redirect_ad.sjs
new file mode 100644
index 0000000000..36be567d3f
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/redirect_ad.sjs
@@ -0,0 +1,10 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function handleRequest(request, response) {
+  response.setStatusLine("1.1", 302, "Found");
+  response.setHeader("Location", "redirect_final.sjs", false);
+  response.setHeader("Cache-Control", "no-cache, must-revalidate", false);
+}
diff --git a/browser/components/search/test/browser/telemetry/redirect_final.sjs b/browser/components/search/test/browser/telemetry/redirect_final.sjs
new file mode 100644
index 0000000000..14debde6ba
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/redirect_final.sjs
@@ -0,0 +1,9 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function handleRequest(request, response) {
+  response.setStatusLine("1.1", 302, "Found");
+  response.setHeader("Location", "https://example.com/hello_world", false);
+}
diff --git a/browser/components/search/test/browser/telemetry/redirect_once.sjs b/browser/components/search/test/browser/telemetry/redirect_once.sjs
new file mode 100644
index 0000000000..d15f3afe6d
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/redirect_once.sjs
@@ -0,0 +1,9 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function handleRequest(request, response) {
+  response.setStatusLine("1.1", 302, "Found");
+  response.setHeader("Location", "redirect_final.sjs", false);
+}
diff --git a/browser/components/search/test/browser/telemetry/redirect_thrice.sjs b/browser/components/search/test/browser/telemetry/redirect_thrice.sjs
new file mode 100644
index 0000000000..b7c7069162
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/redirect_thrice.sjs
@@ -0,0 +1,9 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function handleRequest(request, response) {
+  response.setStatusLine("1.1", 302, "Found");
+  response.setHeader("Location", "redirect_twice.sjs", false);
+}
diff --git a/browser/components/search/test/browser/telemetry/redirect_twice.sjs b/browser/components/search/test/browser/telemetry/redirect_twice.sjs
new file mode 100644
index 0000000000..099d20022e
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/redirect_twice.sjs
@@ -0,0 +1,9 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function handleRequest(request, response) {
+  response.setStatusLine("1.1", 302, "Found");
+  response.setHeader("Location", "redirect_once.sjs", false);
+}
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetry.html b/browser/components/search/test/browser/telemetry/searchTelemetry.html
new file mode 100644
index 0000000000..bd395d4a7c
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetry.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
+  <a href="https://example.com/otherpage">Non ad link</a>
+  <a href="https://example1.com/ad">Matching path prefix, different server</a>
+  <a href="https://mochi.test:8888/otherpage">Non ad link</a>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd.html
new file mode 100644
index 0000000000..23d51d2fb5
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
+  <a id="ad1" href="https://example.com/ad">Ad link</a>
+  <a id="ad2" href="https://example.com/ad2">Second Ad link</a>
+  <!-- The iframe is used to include a sub-document load in the test, which
+       should not affect the recorded telemetry. -->
+  <iframe src="searchTelemetry.html"></iframe>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel.html
new file mode 100644
index 0000000000..71049be20c
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel.html
@@ -0,0 +1,116 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section id="top">
+    <!--
+      Carousels can have multiple hidden links.
+    -->
+    <h5 test-label="true">ad_carousel</h5>
+    <div class="moz-carousel" narrow="true">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <button type="button">Next</button>
+    </div>
+    <!--
+      Carousels can be used for non-ads.
+    -->
+    <h5 test-label="true">non_ad_carousel</h5>
+    <div class="moz-carousel" narrow="true">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/some-normal-path"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/some-normal-path"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Giraffes</h3>
+            </a>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/some-normal-path"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/some-normal-path"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Rhinos</h3>
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+  </section>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_below_the_fold.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_below_the_fold.html
new file mode 100644
index 0000000000..737e1e654b
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_below_the_fold.html
@@ -0,0 +1,83 @@
+<!--
+  This is for testing a carousel below the fold.
+-->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section id="top" style="padding-top: 1000px;">
+    <h5 test-label="true">ad_carousel</h5>
+    <div class="moz-carousel-container">
+      <div class="moz-carousel" narrow="true">
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </section>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_doubled.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_doubled.html
new file mode 100644
index 0000000000..f7b7f948d9
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_doubled.html
@@ -0,0 +1,182 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section id="top">
+    <!--
+      Carousels can have multiple hidden links.
+    -->
+    <h5 test-label="true">ad_carousel</h5>
+    <div class="moz-carousel" narrow="true">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+    </div>
+    <h5 test-label="true">ad_carousel</h5>
+    <div class="moz-carousel" narrow="true" id="second-ad">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+    </div>
+    <!--
+      Carousels can be used for non-ads.
+    -->
+    <h5 test-label="true">non_ad_carousel</h5>
+    <div class="moz-carousel" narrow="true">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/some-normal-path"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/some-normal-path"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Giraffes</h3>
+            </a>
+          </div>
+        </div>
+      </div>
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/some-normal-path"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/some-normal-path"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Rhinos</h3>
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+  </section>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_first_element_non_visible.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_first_element_non_visible.html
new file mode 100644
index 0000000000..b5a44b325e
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_first_element_non_visible.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section id="top">
+    <!--
+      If a user scrolls a carousel before the impression is snapped,
+      we shouldn't count elements that aren't fully shown in the carousel
+      as visible.
+    -->
+    <h5 test-label="true">ad_carousel</h5>
+    <div class="moz-carousel-container">
+      <div class="moz-carousel" narrow="true">
+        <div style="margin-left: -80px;" class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </section>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_hidden.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_hidden.html
new file mode 100644
index 0000000000..cccd714326
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_hidden.html
@@ -0,0 +1,87 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <link rel="stylesheet" type="text/css"
+        href="./serp.css" />
+</head>
+<body>
+  <section id="top">
+    <h5 test-label="true">ad_carousel with display: none;</h5>
+    <div class="moz-carousel" narrow="true" style="display: none;">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <h5 test-label="true">ad_carousel with no width;</h5>
+    <div class="moz-carousel" narrow="true" style="width: 0;">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <h5 test-label="true">ad_carousel with no height;</h5>
+    <div class="moz-carousel" narrow="true" style="height: 0;">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <h5 test-label="true">ad_carousel that is far above the page</h5>
+    <div class="moz-carousel" narrow="true" style="position: absolute; top: -9999px;">
+      <div class="moz-carousel-card">
+        <a class="hidden" href="https://example.com/ad"></a>
+        <a href="https://example.com/some-normal-path">
+          <div class="moz-carousel-image">Image</div>
+        </a>
+        <div class="moz-carousel-card-inner">
+          <div class="moz-carousel-card-inner-content">
+            <a class="hidden" href="https://example.com/ad"></a>
+            <a href="https://example.com/normal-path">
+              <h3>Name of Product</h3>
+            </a>
+            <h3>$199.99</h3>
+            <h3>Example.com</h3>
+          </div>
+        </div>
+      </div>
+    </div>
+  </section>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_outer_container.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_outer_container.html
new file mode 100644
index 0000000000..759bd9f0d9
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_carousel_outer_container.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section id="top">
+    <!--
+      Carousels can sometimes have an outer container that doesn't always show up.
+    -->
+    <h5 test-label="true">ad_carousel</h5>
+    <div class="moz-carousel-container">
+      <div class="moz-carousel" extra="true">
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+        <div class="moz-carousel-card">
+          <a class="hidden" href="https://example.com/ad"></a>
+          <a href="https://example.com/some-normal-path">
+            <div class="moz-carousel-image">Image</div>
+          </a>
+          <div class="moz-carousel-card-inner">
+            <div class="moz-carousel-card-inner-content">
+              <a class="hidden" href="https://example.com/ad"></a>
+              <a href="https://example.com/normal-path">
+                <h3>Name of Product</h3>
+              </a>
+              <h3>$199.99</h3>
+              <h3>Example.com</h3>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </section>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_query_parameters.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_query_parameters.html
new file mode 100644
index 0000000000..7985fb2c51
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_query_parameters.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section id="searchresults">
+    <div class="lhs">
+      <div class="moz_ad">
+        <h5 test-label>ad_sitelink</h5>
+        <!--
+          Note that the query parameter keys are in reverse alphabetical order
+          that will be reversed in the tests.
+        -->
+        <a id="ad_sitelink" href="https://example.com/ad?foo=bar0&baz=bar0">
+          <h2>Example Result</h2>
+        </a>
+        <div class="multi-col">
+          <div>
+            <a href="https://example.com/ad?foo=bar1&baz=bar1">
+              <h2>New Releases</h2>
+            </a>
+            <span>Cras ac velit sed tellus</span>
+          </div>
+        </div>
+      </div>
+      <div class="moz_ad">
+        <h5 test-label>ad_link</h5>
+        <a id="ad_link" href="https://example.com/ad?foo=bar2&baz=bar2">
+          <h2>Example Result</h2>
+        </a>
+      </div>
+    </div>
+  </section>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_text.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_text.html
new file mode 100644
index 0000000000..66f056fb25
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_text.html
@@ -0,0 +1,112 @@
+<!--
+  Text ads reuse the data-ad element in multiple components to make it
+  difficult to determine which component it belongs to, similar to Bing.
+-->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section id="searchresults">
+    <div class="lhs">
+      <div class="moz_ad">
+        <h5 test-label>ad_sitelink</h5>
+        <a href="https://example.com/ad/1">
+          <h2>Example Result</h2>
+        </a>
+        <span><a href="https://example.com/ad/2">Ad link that says there are 10 Locations nearby</a></span>
+        <div class="multi-col">
+          <div>
+            <a href="https://example.com/ad/3">
+              <h2>New Releases</h2>
+            </a>
+            <span>Cras ac velit sed tellus</span>
+          </div>
+          <div>
+            <a id="deep_ad_sitelink" href="https://example.com/ad/4">
+              <h2>Men's</h2>
+            </a>
+            <span>Cras ac velit sed tellus</span>
+          </div>
+          <div>
+            <a href="https://example.com/ad/5">
+              <h2>Women's</h2>
+            </a>
+            <span>Cras ac velit sed tellus</span>
+          </div>
+          <div>
+            <!-- Ensure ads encoded in data-attributes are also recorded properly -->
+            <a data-moz-attr="https://example.com/ad/6" href="https://example.com/normal-link">
+              <h2>Sale</h2>
+            </a>
+            <span>Cras ac velit sed tellus</span>
+          </div>
+        </div>
+      </div>
+      <div class="moz_ad">
+        <h5 test-label>ad_link</h5>
+        <a id="ad_link_redirect" href="https://example.org/browser/browser/components/search/test/browser/telemetry/redirect_ad.sjs">
+          <h2>Example Shop</h2>
+        </a>
+        <div class="factrow">
+          <a href="https://example.com/ad/8">Home Page</a>
+          <a href="https://example.com/ad/9">Products</a>
+          <a href="https://example.com/ad/10">Sales</a>
+        </div>
+      </div>
+      <div class="moz_ad">
+        <h5 test-label>ad_link</h5>
+        <a href="https://example.com/ad/11">
+          <h2>Example Shop</h2>
+        </a>
+      </div>
+      <div>
+        <h5 test-label>non_ads_link</h5>
+        <a id="non_ads_link" href="https://example.com/browser/browser/components/search/test/browser/telemetry/cacheable.html">
+          Example of a cached non ad
+        </a><br />
+        <a id="non_ads_link_redirected" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect.html">
+          Example of a redirected non ad link
+        </a><br />
+        <a id="non_ads_link_redirected_no_top_level" href="#">
+          Example of a redirected non ad link that isn't initially top level loaded
+        </a><br />
+        <a id="non_ads_link_multiple_redirects" href="https://example.com/browser/browser/components/search/test/browser/telemetry/redirect_thrice.sjs">
+          Example of a redirected non ad link that's redirected multiple times
+        </a><br />
+        <a id="non_ads_link_with_special_characters_in_path" href="https://example.com/path'?hello_world&foo=bar's">
+          Example of a non ad with special characters in path
+        </a>
+      </div>
+    </div>
+    <div class="rhs">
+      <h5 test-label>ad_sidebar</h5>
+      <div class="moz_ad">
+        <a href="https://example.com/ad/15">
+          <div class="mock-image">Mock ad image</div>
+        </a>
+        <a href="https://example.com/ad/16">
+          <h3>Buy Example Now</h3>
+        </a>
+        <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</p>
+        <a href="https://example.com/ad/17">Buy Now</a>
+      </div>
+    </div>
+  </section>
+  <iframe style="display: none;"></iframe>
+  <script>
+    window.addEventListener("message", (event) => {
+      if (event.origin == "https://example.org") {
+        window.location.href = event.data;
+      }
+    });
+    document.getElementById("non_ads_link_redirected_no_top_level")
+      .addEventListener("click", (event) => {
+        event.preventDefault();
+        let iframe = document.querySelector("iframe");
+        iframe.src = "https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html";
+    });
+  </script>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_visibility.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_visibility.html
new file mode 100644
index 0000000000..475ada3a3c
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_components_visibility.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section id="top">
+    <div style="display: flex; gap: 20px;">
+      <div>
+        <h5 test-label="true">ad_link</h5>
+        <!-- The parent size exceeds the window height but the first ad link is above the fold. -->
+        <div class="moz_ad" style="padding-bottom: 2000px;">
+          <a href="https://example.com/ad">Ad Link</a>
+        </div>
+      </div>
+      <div>
+        <h5 test-label="true" >ad_link</h5>
+        <a href="https://example.com/ad">Ad Link</a>
+      </div>
+      <!-- The ad links are below the fold but the test will scroll to it before the impression is recorded. -->
+      <div>
+        <h5 test-label="true">ad_link</h5>
+        <div id="second-ad" class="moz_ad" style="padding-top: 2000px;">
+          <a href="https://example.com/ad">Ad Link</a>
+        </div>
+      </div>
+      <div>
+        <h5 test-label="true" style="margin-bottom: 2000px;">ad_link</h5>
+        <a href="https://example.com/ad">Ad Link</a>
+      </div>
+      <!-- The ad links are below the fold and shouldn't be viewed in the test. -->
+      <div>
+        <h5 test-label="true">ad_link</h5>
+        <div class="moz_ad" style="padding-top: 4000px;">
+          <a href="https://example.com/ad">Ad Link</a>
+        </div>
+      </div>
+      <div>
+        <h5 test-label="true" style="margin-bottom: 4000px;">ad_link</h5>
+        <a href="https://example.com/ad">Ad Link</a>
+      </div>
+    </div>
+  </section>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes.html
new file mode 100644
index 0000000000..7bc1b2745e
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes.html
@@ -0,0 +1,10 @@
+<!-- This HTML file encodes the ad link in the data attribute -->
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
+  <a data-xyz="https://example.com/ad123" href="https://example.com/otherpage">Ad link</a>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes_href.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes_href.html
new file mode 100644
index 0000000000..319485cfae
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes_href.html
@@ -0,0 +1,10 @@
+<!-- This HTML file encodes the ad link in the href attribute and has irrelevant data in data attribute -->
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
+  <a data-xyz="https://example.com/otherpage" href="https://example.com/ad123">Ad link</a>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes_none.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes_none.html
new file mode 100644
index 0000000000..a119cf71be
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_dataAttributes_none.html
@@ -0,0 +1,10 @@
+<!-- This HTML file has non-ad data in both the href and data attribute -->
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
+  <a data-xyz="https://example.com/otherpage" href="https://example.com/otherpage">Non-Ad Link</a>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect.html
new file mode 100644
index 0000000000..d987356d7e
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Page will do a redirect</title>
+    <meta content="0;url=https://example.com/hello_world" http-equiv="refresh">
+</head>
+<body>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect.html^headers^ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect.html^headers^
new file mode 100644
index 0000000000..94cde2a288
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect.html^headers^
@@ -0,0 +1 @@
+Cache-Control: no-cache, must-revalidate
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html
new file mode 100644
index 0000000000..1c5c31cb38
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Page will do a redirect without doing it in a top load</title>
+    <!-- <meta content="0;url=https://example.com/hello_world" http-equiv="refresh"> -->
+    <script>
+      let parentWindow = window.parent;
+      let url = "https://example.com/hello_world";
+      parentWindow.postMessage(url, "*");
+    </script>
+  </head>
+  <body>
+  </body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html^headers^ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html^headers^
new file mode 100644
index 0000000000..419697b050
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_nonAdsLink_redirect_nonTopLoaded.html^headers^
@@ -0,0 +1,4 @@
+Cache-Control: no-cache, must-revalidate
+Pragma: no-cache
+Expires: Fri, 01 Jan 1990 00:00:00 GMT
+Content-Type: text/html; charset=ISO-8859-1
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html
new file mode 100644
index 0000000000..7ba3f84f6b
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section>
+    <form role="search">
+      <input type="text" value="test" />
+      <div>
+        <ul>
+          <li id="suggest">test</li>
+      </div>
+    </form>
+  </section>
+  <section id="searchresults">
+    <div class="lhs">
+      <div>
+        <h5 test-label>non_ads_link</h5>
+        <a id="non_ads_link" href="https://example.com/hello_world">
+          <h2>Example of a non ad</h2>
+        </a>
+      </div>
+    </div>
+  </section>
+</body>
+<script type="text/javascript">
+  document.querySelector("form").addEventListener("submit", event => {
+    event.preventDefault();
+    window.location.href = "https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html?s=test+suggest&abc=ff";
+  })
+  document.getElementById("suggest").addEventListener("click", event => {
+    event.preventDefault();
+    window.location.href = "https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html?s=test+suggest&abc=ff";
+  })
+</script>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html^headers^ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html^headers^
new file mode 100644
index 0000000000..62847d0585
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html^headers^
@@ -0,0 +1 @@
+Cache-Control: private, max-age=0
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html
new file mode 100644
index 0000000000..9c4d371691
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <link rel="stylesheet" type="text/css" href="./serp.css" />
+</head>
+<body>
+  <section>
+    <form role="search">
+      <input type="text" value="test" />
+    </form>
+  </section>
+  <nav>
+    <a id="images" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html?s=test&page=images">Images</a>
+    <a id="shopping" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html?s=test&page=shopping">Shopping</a>
+    <a id="extra" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox.html?s=test">Extra Page</a>
+  </nav>
+  <section class="refined-search-buttons">
+    <a id="refined-search-button" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html?s=test's">Test's</a>
+    <a id="refined-search-button-with-partner-code" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html?s=test2&abc=ff">Test 2</a>
+  </section>
+  <section id="searchresults">
+    <div class="lhs">
+      <div>
+        <h2>Related Searches</h2>
+        <a id="related-new-tab" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html?s=test+one+two+three" target="_blank">test one two three</a>
+        <a id="related-redirect" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content_redirect.html" target="_blank">test one two three</a>
+        <a id="related-in-page" href="https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html?s=test+one+two+three">test one two three</a>
+      </div>
+    </div>
+  </section>
+</body>
+<script type="text/javascript">
+  document.querySelector("form").addEventListener("submit", event => {
+    event.preventDefault();
+    window.location.href = "https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html?s=test&abc=ff";
+  });
+</script>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html^headers^ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html^headers^
new file mode 100644
index 0000000000..94cde2a288
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html^headers^
@@ -0,0 +1 @@
+Cache-Control: no-cache, must-revalidate
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content_redirect.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content_redirect.html
new file mode 100644
index 0000000000..c8a3245446
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content_redirect.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Page will do a redirect</title>
+    <meta content="0;url=https://example.org/browser/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content.html?s=test+one+two+three" http-equiv="refresh">
+</head>
+<body>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content_redirect.html^headers^ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content_redirect.html^headers^
new file mode 100644
index 0000000000..94cde2a288
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_searchbox_with_content_redirect.html^headers^
@@ -0,0 +1 @@
+Cache-Control: no-cache, must-revalidate
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryAd_shopping.html b/browser/components/search/test/browser/telemetry/searchTelemetryAd_shopping.html
new file mode 100644
index 0000000000..faa6c057a4
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryAd_shopping.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+<body>
+    <nav>
+      <a href="https://example.org/search?q=something&page=images&foo=bar">Images</a>
+      <a id="shopping" href="https://example.org/search?q=something&page=shopping&foo=bar">Shopping</a>
+    </nav>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorization.html b/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorization.html
new file mode 100644
index 0000000000..b9569ba2d6
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorization.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+<body>
+  <div id="results">
+    <!-- Don't include domains matching the provider. -->
+    <div class="organic">
+      <a href="https://www.example.com"></a>
+      <a href="https://example.com"></a>
+    </div>
+    <div class="organic">
+      <a href="https://www.foobar.org"></a>
+    </div>
+    <div data-ad-domain="abc.org">
+      <a href="https://www.example.com/"></a>
+    </div>
+    <div>
+      <a class="ad" href="https://www.example.com/?ad_domain=def.org"></a>
+    </div>
+    <!-- Don't throw on anchors with non-standard or non-existent hrefs -->
+    <div>
+      <a href="javascript:console.log('hello world')">A javascript: URL link</a>
+    </div>
+    <div>
+      <a>An anchor that's missing an href attribute</a>
+    </div>
+    <div>
+      <a href="#">An anchor with a dummy href attribute value</a>
+    </div>
+  </div>
+  <aside>
+    <div class="organic">
+      <a href="https://foobaz.com"></a>
+    </div>
+  </aside>
+  <div class="organic">
+    <!-- Should not find this because it's not part of the results -->
+    <a href="https://outside-results.ca"></a>
+  </div>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorizationCapProcessedDomains.html b/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorizationCapProcessedDomains.html
new file mode 100644
index 0000000000..63a44b8e77
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorizationCapProcessedDomains.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+<body>
+  <div id="results">
+    <div class="organic">
+      <a href="https://www.test1.com">Organic Link 1</a>
+      <a href="https://www.test2.com">Organic Link 2</a>
+      <a href="https://www.test3.com">Organic Link 3</a>
+      <a href="https://www.test4.com">Organic Link 4</a>
+      <a href="https://www.test5.com">Organic Link 5</a>
+      <a href="https://www.test6.com">Organic Link 6</a>
+      <a href="https://www.test7.com">Organic Link 7</a>
+      <a href="https://www.test8.com">Organic Link 8</a>
+      <a href="https://www.test9.com">Organic Link 9</a>
+      <a href="https://www.test10.com">Organic Link 10</a>
+      <a href="https://www.test11.com">Organic Link 11</a>
+      <a href="https://www.test12.com">Organic Link 12</a>
+    </div>
+
+    <div class="ad">
+      <div data-ad-domain="foo.com">
+        <a href="https://www.test13.com/">Non-organic Link 1</a>
+      </div>
+      <div data-ad-domain="bar.com">
+        <a href="https://www.test14.com/">Non-organic Link 2</a>
+      </div>
+      <div data-ad-domain="baz.com">
+        <a href="https://www.test15.com/">Non-organic Link 3</a>
+      </div>
+      <div data-ad-domain="qux.com">
+        <a href="https://www.test16.com/">Non-organic Link 4</a>
+      </div>
+      <div data-ad-domain="abc.com">
+        <a href="https://www.test17.com/">Non-organic Link 5</a>
+      </div>
+      <div data-ad-domain="def.com">
+        <a href="https://www.test18.com/">Non-organic Link 6</a>
+      </div>
+      <div>
+        <a class="ad" href="https://www.test19.com/?ad_domain=ghi.org">Non-organic Link 7</a>
+      </div>
+      <div>
+        <a class="ad" href="https://www.test20.com/?ad_domain=jkl.org">Non-organic Link 8</a>
+      </div>
+      <div>
+        <a class="ad" href="https://www.test21.com/?ad_domain=mno.org">Non-organic Link 9</a>
+      </div>
+      <div>
+        <a class="ad" href="https://www.test22.com/?ad_domain=pqr.org">Non-organic Link 10</a>
+      </div>
+      <div>
+        <a class="ad" href="https://www.test23.com/?ad_domain=stu.org">Non-organic Link 11</a>
+      </div>
+      <div>
+        <a class="ad" href="https://www.test24.com/?ad_domain=vwx.org">Non-organic Link 12</a>
+      </div>
+    </div>
+  </div>
+</body>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorizationReporting.html b/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorizationReporting.html
new file mode 100644
index 0000000000..22f763191a
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryDomainCategorizationReporting.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+<body>
+  <div id="results">
+    <!-- Don't include domains matching the provider. -->
+    <div class="organic">
+      <a href="https://www.example.com">Link</a>
+      <a href="https://example.com">Link</a>
+    </div>
+    <div class="organic">
+      <a href="https://www.foobar.org">Link</a>
+    </div>
+    <div data-ad-domain="abc.org">
+      <a href="https://example.com/ad">Sponsored Link</a>
+    </div>
+    <div>
+      <a class="ad" href="https://example.com/ad?ad_domain=def.org">Sponsored Link</a>
+    </div>
+    <!-- Don't throw on anchors with non-standard or non-existent hrefs -->
+    <div>
+      <a href="javascript:console.log('hello world')">A javascript: URL link</a>
+    </div>
+    <div>
+      <a>An anchor that's missing an href attribute</a>
+    </div>
+    <div>
+      <a href="#">An anchor with a dummy href attribute value</a>
+    </div>
+  </div>
+  <aside>
+    <div class="organic">
+      <a href="https://foobaz.com"></a>
+    </div>
+  </aside>
+  <div class="organic">
+    <!-- Should not find this because it's not part of the results -->
+    <a href="https://outside-results.ca"></a>
+  </div>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetryDomainExtraction.html b/browser/components/search/test/browser/telemetry/searchTelemetryDomainExtraction.html
new file mode 100644
index 0000000000..b49e5610ae
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetryDomainExtraction.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+<body>
+  <div id="results">
+    <div id="test1">
+      <div data-layout="organic">
+        <a href="https://foobar.com" data-testid="result-title-a">Extract domain from href (absolute URL).</a>
+      </div>
+    </div>
+
+     <div id="test2">
+      <div data-layout="organic">
+        <a href="https://foo.com" data-testid="result-title-a">Extract domain from href (absolute URL) - link1.</a>
+        <a href="https://bar.com" data-testid="result-title-a">Extract domain from href (absolute URL) - link2.</a>
+        <a href="https://baz.com" data-testid="result-title-a">Extract domain from href (absolute URL) - link3.</a>
+        <a href="https://qux.com" data-testid="result-title-a">Extract domain from href (absolute URL) - link4.</a>
+      </div>
+    </div>
+
+    <div id="test3">
+      <div data-layout="organic">
+        <a href="/dummy-page" data-testid="result-title-a">Extract domain from href (relative URL).</a>
+      </div>
+    </div>
+
+    <div id="test4">
+      <a href="#" data-dtld="www.abc.com">Extract domain from data attribute.</a>
+    </div>
+
+    <div id="test5">
+      <a href="#" data-dtld="www.foo.com">Extract domain from data attribute - link1.</a>
+      <a href="#" data-dtld="www.bar.com">Extract domain from data attribute - link2.</a>
+      <a href="#" data-dtld="www.baz.com">Extract domain from data attribute - link3.</a>
+      <a href="#" data-dtld="www.qux.com">Extract domain from data attribute - link4.</a>
+    </div>
+
+    <div id="test6">
+      <a href="example.com/testing?ad_domain=def.com" class="js-carousel-item-title">Extract domain from an href's query param value.</a>
+    </div>
+
+    <div id="test7">
+      <a href="https://example.com/test?ad_domain=https://def.com/path/to/nowhere">Extract domain from an href's query param value containing an absolute href.</a>
+    </div>
+
+    <div id="test8">
+      <a href="https://example.com/test?ad_domain=def.com/path/to/nowhere">Extract domain from an href's query param value containing a relative href.</a>
+    </div>
+
+    <div id="test9">
+      <a href="https://example.com/test?dummy_key=foo.com">Param value is missing from the href.</a>
+    </div>
+
+    <div id="test10">
+      <!-- Extraction preserves order of domains within the page. -->
+      <div data-layout="organic">
+        <a href="https://foobar.com" data-testid="result-title-a">Extract domain from href (absolute URL).</a>
+        <a href="#" data-dtld="www.abc.com">Extract domain from data attribute.</a>
+        <a href="example.com/testing?ad_domain=def.com" class="js-carousel-item-title">Extract domain from an href's query param value.</a>
+      </div>
+    </div>
+
+    <div id="test11">
+      <a href="nomatches.com">Link that doesn't match a selector.</a>
+    </div>
+
+    <div id="test12">
+      <a href="#" data-dtld="">Data attribute is present, but value is missing.</a>
+    </div>
+
+    <div id="test13">
+      <a href="example.com/testing?ad_domain=" class="js-carousel-item-title">Query param is present, but value is missing.</a>
+    </div>
+
+    <div id="test14">
+      <a href="git://testing.com/testrepo">Non-standard URL scheme.</a>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/searchTelemetrySinglePageApp.html b/browser/components/search/test/browser/telemetry/searchTelemetrySinglePageApp.html
new file mode 100644
index 0000000000..7598da694e
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/searchTelemetrySinglePageApp.html
@@ -0,0 +1,243 @@
+<!DOCTYPE html>
+<!--
+  This SERP loads content dynamically. When a search term is provided in the
+  query parameter, it'll populate results using it.
+
+  Clicking images will load a fake results page with some ad links to ensure
+  we aren't tracking them again.
+
+  Searching "no-ads" will load a results page with no ads. This is so that if
+  there are multiple tabs open with a SERP and we tell an actor to look for an
+  ad, there shouldn't be any results.
+-->
+<html>
+<head>
+  <title>Fake SERP</title>
+  <meta charset="utf-8">
+</head>
+<body>
+  <nav style="display: flex; gap: 10px;">
+    <a id="all" data-menu="all">All</a>
+    <a id="images" data-menu="images">Images</a>
+  </nav>
+  <div id="searchbox-container">
+    <input id="searchbox" type="text" placeholder="search" />
+    <div id="searchbox-suggestions"></div>
+  </div>
+  <div style="margin: 10px 0;" id="results"></div>
+  <div id="related-searches"></div>
+  <script>
+    const allTab = document.querySelector("[data-menu='all']");
+    const imagesTab = document.querySelector("[data-menu='images']");
+    const results = document.getElementById("results");
+    const related = document.getElementById("related-searches");
+    const searchBox = document.getElementById("searchbox");
+    const suggestion = document.getElementById("searchbox-suggestions");
+    let searchKey = "s";
+
+    function getSearchTerm(){
+      let searchTerm = new URL(window.location.href).searchParams.get(searchKey);
+      if (!searchTerm) {
+        return "";
+      }
+      return { originalSearchTerm: searchTerm, searchTerm: searchTerm.replaceAll("+", " ") };
+    }
+
+    function replaceWithBasicResults() {
+      let { originalSearchTerm, searchTerm } = getSearchTerm();
+      let hasAds = !searchTerm.startsWith("no ads");
+      if (!searchTerm) {
+        return;
+      }
+      let result = `
+        <div>
+          <a id="organic" href="https://example.com/nonad+${originalSearchTerm}">
+            Non Ad Result - ${searchTerm}
+          </a>
+        </div>
+      `;
+      if (hasAds) {
+        result += `
+        <div>
+          <a id="ad" href="https://example.com/ad+${originalSearchTerm}">
+            Ad Result - ${searchTerm}
+          </a>
+        </div>
+        <div>
+          <a id="ad-redirect" href="https://example.org/browser/browser/components/search/test/browser/telemetry/redirect_ad.sjs">
+            Ad Result Redirect - ${searchTerm}
+          </a>
+        </div>
+      `;
+      }
+      results.innerHTML = result;
+    }
+
+    function replaceWithOtherResults() {
+      let { searchTerm } = getSearchTerm();
+      if (!searchTerm) {
+        return;
+      }
+      let result = `
+        <div style="width: 200px; height: 100px; background-color: #333;">
+          <a style="color: #FFF;"
+            href="https://example.com/otherpage">Non Ad Image - ${searchTerm}
+          </a>
+        </div>
+        <div style="width: 200px; height: 100px; background-color: #333;">
+          <a style="color: #FFF;"
+            href="https://example.com/ad">Ad Image - ${searchTerm}
+          </a>
+        </div>
+      `;
+      results.innerHTML = result;
+    }
+
+    function updateSearchbox() {
+      let { searchTerm } = getSearchTerm();
+      searchBox.value = searchTerm;
+    }
+
+    function updateSuggestions() {
+      let { searchTerm } = getSearchTerm();
+      let suggestions = `
+        <div id="first-suggestion" data-search="${searchTerm} suggestion">${searchTerm} suggestion</div>
+      `
+      suggestion.innerHTML = suggestions;
+    }
+
+    function updateNav() {
+      let baseUrl = new URL(window.location.href);
+
+      baseUrl.searchParams.set("page", "web");
+      allTab.href = baseUrl.href;
+
+      baseUrl.searchParams.set("page", "images");
+      imagesTab.href = baseUrl.href;
+    }
+
+    function updatePageState({ page = "", query = "" }) {
+      let url = new URL(window.location.href);
+      if (page) {
+        url.searchParams.set("page", page);
+      }
+      if (query) {
+        url.searchParams.set(searchKey, query);
+      }
+      history.pushState({}, "", url);
+    }
+
+    function updateRelatedSearches() {
+      let url = new URL(window.location.href);
+      let searchTerm = url.searchParams.get(searchKey);
+      let page = url.searchParams.get("page");
+
+      let innerResults = "";
+      if (searchTerm && page == "web") {
+        innerResults = `
+          <div>
+            <a id="related-search" data-search="how to ${searchTerm}" href="#">
+              how to ${searchTerm}
+            </a>
+          </div>
+          <div>
+            <a id="related-search-without-ads" data-search="no ads ${searchTerm}" href="#">
+              no ads related result for ${searchTerm}
+            </a>
+          </div>
+        `;
+      }
+      document.getElementById("related-searches").innerHTML = innerResults;
+    }
+
+    allTab.addEventListener("click", (event) => {
+      event.preventDefault();
+      updatePageState({ page: "web" });
+      replaceWithBasicResults();
+      updateRelatedSearches();
+      updateSearchbox();
+      updateSuggestions();
+    });
+
+    imagesTab.addEventListener("click", (event) => {
+      event.preventDefault();
+      updatePageState({ page: "images" });
+      replaceWithOtherResults();
+      updateRelatedSearches();
+      updateSearchbox();
+      updateSuggestions();
+    });
+
+    related.addEventListener("click", (event) => {
+      event.preventDefault();
+      let search = event.target.dataset.search;
+      if (search) {
+        updatePageState({ page: "web", query: search });
+        replaceWithBasicResults();
+        updateRelatedSearches();
+        updateNav();
+        updateSearchbox();
+        updateSuggestions();
+      }
+    });
+
+    suggestion.addEventListener("click", (event) => {
+      event.preventDefault();
+      let search = event.target.dataset.search;
+      let baseUrl = new URL(window.location.href);
+      let page = baseUrl.searchParams.get("page");
+      updatePageState({ page, query: search });
+      switch (page) {
+        case "web":
+          replaceWithBasicResults();
+          updateRelatedSearches();
+          updateNav();
+          updateSearchbox();
+          updateSuggestions();
+          break;
+        case "images":
+          replaceWithOtherResults();
+          updateRelatedSearches();
+          updateSearchbox();
+          updateSuggestions();
+          break;
+      }
+    })
+
+    window.addEventListener("DOMContentLoaded", (event) => {
+      let url = new URL(window.location.href);
+      searchKey = url.searchParams.has("r") ? "r": "s";
+
+      // When the page is loaded, we add a query parameter denoting the type
+      // of SERP this belongs to, mimicking how some SERPs operate.
+      url.searchParams.set("page", "web");
+      history.replaceState({}, "", url);
+      replaceWithBasicResults();
+      updateNav();
+      updateRelatedSearches();
+      updateSearchbox();
+      updateSuggestions();
+    });
+
+    window.addEventListener("popstate", (event) => {
+      let baseUrl = new URL(window.location.href);
+      let page = baseUrl.searchParams.get("page");
+      switch (page) {
+        case "web":
+          replaceWithBasicResults();
+          updateNav();
+          updateRelatedSearches();
+          updateSearchbox();
+          updateSuggestions();
+          break;
+        case "images":
+          replaceWithOtherResults();
+          updateRelatedSearches();
+          updateSearchbox();
+          break;
+      }
+    });
+
+  </script>
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/serp.css b/browser/components/search/test/browser/telemetry/serp.css
new file mode 100644
index 0000000000..5b3865da44
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/serp.css
@@ -0,0 +1,164 @@
+:root {
+  --margin-left: 80px;
+  --subtle: whitesmoke;
+  --carousel-card-width: 180px;
+}
+
+body {
+  margin: 0;
+  padding: 0 0 80px 0;
+}
+
+a:link {
+  text-decoration: none;
+}
+
+a:visited {
+  color: blue;
+}
+
+h5[test-label] {
+  margin-top: 30px;
+  margin-bottom: 4px;
+}
+
+nav {
+  border-bottom: 1px solid #ececec;
+  padding-bottom: 20px;
+  margin-bottom: 20px;
+}
+
+#searchform {
+  padding-top: 20px;
+  margin-bottom: 20px;
+}
+
+nav>div,
+#searchform,
+.moz-carousel,
+.factrow {
+  display: flex;
+  align-items: center;
+}
+
+nav>div,
+#searchform {
+  gap: 40px;
+}
+
+nav>div,
+#searchform,
+#searchresults,
+#top {
+  margin-left: var(--margin-left);
+}
+
+#searchbox {
+  font-size: 14px;
+  padding: 10px 20px;
+  width: 300px;
+  border-radius: 20px;
+  border: 2px solid var(--subtle);
+  height: 20px;
+}
+
+.card-container {
+  white-space: nowrap;
+  overflow-x: auto;
+  overflow-y: hidden;
+}
+
+.card-container>.card {
+  height: 160px;
+  border-radius: 3px;
+  border: 1px solid var(--subtle);
+  display: inline-block;
+  box-sizing: border-box;
+  padding: 10px;
+}
+
+.card-container>.card:not(:last-child) {
+  margin-right: 10px;
+}
+
+.card-container>.card>a {
+  display: block;
+  margin-bottom: 2px;
+}
+
+#searchresults {
+  width: 900px;
+  display: grid;
+  grid-template-columns: 600px 300px;
+}
+
+.moz-carousel,
+.factrow {
+  gap: 10px;
+}
+
+.moz-carousel {
+  overflow: hidden;
+}
+
+.moz-carousel[narrow],
+.moz-carousel-container {
+  width: calc(var(--carousel-card-width) * 3 + (3 * 10px));
+  overflow-x: auto;
+}
+
+.moz-carousel[extra] {
+  width: calc(var(--carousel-card-width) * 4 + (3 * 10px));
+}
+
+.moz-carousel>.moz-inner {
+  border: 1px solid var(--subtle);
+  border-radius: 10px;
+  padding: 10px;
+}
+
+.moz-carousel>.moz-carousel-card {
+  flex: 1 0 var(--carousel-card-width);
+  border: 1px solid var(--subtle);
+  font-size: 14px;
+}
+
+.moz-carousel-card .moz-carousel-image {
+  width: 100%;
+  height: 120px;
+  background-color: var(--subtle);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.moz-carousel-card-inner-content {
+  padding: 10px 20px 20px 20px;
+}
+
+.multi-col {
+  display: grid;
+  padding: 10px 20px 20px 20px;
+  grid-template-columns: 1fr 1fr;
+  gap: 10px;
+}
+
+.mock-image {
+  height: 100px;
+  background-color: var(--subtle);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+/* Some SERPs hide anchors using CSS */
+.hidden {
+  display: none;
+}
+
+/* Typography */
+h2 {
+  line-height: 100%;
+  margin-bottom: 10px;
+  margin-top: 10px;
+}
diff --git a/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads.html b/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads.html
new file mode 100644
index 0000000000..8408066897
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
+  <a id="ad1" href="https://example.com/ad">Ad link</a>
+  <a id="ad2" href="https://example.com/ad2">Second Ad link</a>
+  <!-- The iframe is used to include a sub-document load in the test, which
+       should not affect the recorded telemetry. -->
+  <iframe src="searchTelemetry.html"></iframe>
+  <img src="https://example.org/browser/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads.sjs">
+</body>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads.sjs b/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads.sjs
new file mode 100644
index 0000000000..7a6382d1cb
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads.sjs
@@ -0,0 +1,21 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function handleRequest(request, response) {
+  const DELAY_MS = 2000;
+  response.processAsync();
+
+  response.setHeader("Cache-Control", "no-cache", false);
+  response.setHeader("Content-Type", "image/png", false);
+  response.write("Start loading image");
+
+  let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+  timer.init(
+    () => {
+      response.write("Finish loading image");
+      response.finish();
+    },
+    DELAY_MS,
+    Ci.nsITimer.TYPE_ONE_SHOT
+  );
+}
diff --git a/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads_on_load_event.html b/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads_on_load_event.html
new file mode 100644
index 0000000000..517dd30206
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads_on_load_event.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+</head>
+<body id='body'>
+</body>
+  <img src="https://example.org/browser/browser/components/search/test/browser/telemetry/slow_loading_page_with_ads.sjs">
+  <script>
+    setTimeout(() => {
+      let body = document.getElementById('body');
+      let ad1 = document.createElement('a');
+      ad1.setAttribute('id', 'ad1');
+      ad1.setAttribute('href', 'https://example.com/ad');
+      ad1.innerHTML = 'Ad link'
+
+      let ad2 = document.createElement('a');
+      ad2.setAttribute('id', 'ad2');
+      ad2.setAttribute('href', 'https://example.com/ad2');
+      ad2.innerHTML = 'Second Ad link'
+
+      let frame = document.createElement('iframe');
+      frame.setAttribute('src', 'searchTelemetry.html');
+
+      body.appendChild(ad1);
+      body.appendChild(ad2);
+      body.appendChild(frame);
+    }, 2000);
+  </script>
+</html>
diff --git a/browser/components/search/test/browser/telemetry/telemetrySearchSuggestions.sjs b/browser/components/search/test/browser/telemetry/telemetrySearchSuggestions.sjs
new file mode 100644
index 0000000000..1978b4f665
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/telemetrySearchSuggestions.sjs
@@ -0,0 +1,9 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function handleRequest(req, resp) {
+  let suffixes = ["foo", "bar"];
+  let data = [req.queryString, suffixes.map(s => req.queryString + s)];
+  resp.setHeader("Content-Type", "application/json", false);
+  resp.write(JSON.stringify(data));
+}
diff --git a/browser/components/search/test/browser/telemetry/telemetrySearchSuggestions.xml b/browser/components/search/test/browser/telemetry/telemetrySearchSuggestions.xml
new file mode 100644
index 0000000000..4a3f6cdf33
--- /dev/null
+++ b/browser/components/search/test/browser/telemetry/telemetrySearchSuggestions.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
+<ShortName>browser_UsageTelemetry usageTelemetrySearchSuggestions.xml</ShortName>
+<Url type="application/x-suggestions+json" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/telemetry/telemetrySearchSuggestions.sjs?{searchTerms}"/>
+<Url type="text/html" method="GET" template="http://example.com" rel="searchform"/>
+</SearchPlugin>
diff --git a/browser/components/search/test/browser/test.html b/browser/components/search/test/browser/test.html
new file mode 100644
index 0000000000..a39bece4ff
--- /dev/null
+++ b/browser/components/search/test/browser/test.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8" />
+  <title>Bug 426329</title>
+</head>
+<body></body>
+</html>
diff --git a/browser/components/search/test/browser/testEngine.xml b/browser/components/search/test/browser/testEngine.xml
new file mode 100644
index 0000000000..9c25993232
--- /dev/null
+++ b/browser/components/search/test/browser/testEngine.xml
@@ -0,0 +1,12 @@
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/"
+                       xmlns:moz="http://www.mozilla.org/2006/browser/search/">
+  <ShortName>Foo</ShortName>
+  <Description>Foo Search</Description>
+  <InputEncoding>utf-8</InputEncoding>
+  <Image width="16" height="16">data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAABGklEQVQoz2NgGB6AnZ1dUlJSXl4eSDIyMhLW4Ovr%2B%2Fr168uXL69Zs4YoG%2BLi4i5dusTExMTGxsbNzd3f37937976%2BnpmZmagbHR09J49e5YvX66kpATVEBYW9ubNm2nTphkbG7e2tp44cQLIuHfvXm5urpaWFlDKysqqu7v73LlzECMYIiIiHj58mJCQoKKicvXq1bS0NKBgW1vbjh074uPjgeqAXE1NzSdPnvDz84M0AEUvXLgAsW379u1z5swBen3jxo2zZ892cHB4%2BvQp0KlAfwI1cHJyghQFBwfv2rULokFXV%2FfixYu7d%2B8GGqGgoMDKyrpu3br9%2B%2FcDuXl5eVA%2FAEWBfoWHAdAYoNuAYQ0XAeoUERFhGDYAAPoUaT2dfWJuAAAAAElFTkSuQmCC</Image>
+  <Url type="text/html" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/?search">
+    <Param name="test" value="{searchTerms}"/>
+  </Url>
+  <moz:SearchForm>http://mochi.test:8888/browser/browser/components/search/test/browser/</moz:SearchForm>
+  <moz:Alias>fooalias</moz:Alias>
+</OpenSearchDescription>
diff --git a/browser/components/search/test/browser/testEngine_chromeicon.xml b/browser/components/search/test/browser/testEngine_chromeicon.xml
new file mode 100644
index 0000000000..3ce80bcaea
--- /dev/null
+++ b/browser/components/search/test/browser/testEngine_chromeicon.xml
@@ -0,0 +1,12 @@
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/"
+                       xmlns:moz="http://www.mozilla.org/2006/browser/search/">
+  <ShortName>FooChromeIcon</ShortName>
+  <Description>Foo Chrome Icon Search</Description>
+  <InputEncoding>utf-8</InputEncoding>
+  <Image width="16" height="16">chrome://browser/skin/info.svg</Image>
+  <Url type="text/html" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/?search">
+    <Param name="test" value="{searchTerms}"/>
+  </Url>
+  <moz:SearchForm>http://mochi.test:8888/browser/browser/components/search/test/browser/</moz:SearchForm>
+  <moz:Alias>foochromeiconalias</moz:Alias>
+</OpenSearchDescription>
diff --git a/browser/components/search/test/browser/testEngine_diacritics.xml b/browser/components/search/test/browser/testEngine_diacritics.xml
new file mode 100644
index 0000000000..340893348d
--- /dev/null
+++ b/browser/components/search/test/browser/testEngine_diacritics.xml
@@ -0,0 +1,12 @@
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/"
+                       xmlns:moz="http://www.mozilla.org/2006/browser/search/">
+  <ShortName>Foo &#9825;</ShortName>
+  <Description>Engine whose ShortName contains non-BMP Unicode characters</Description>
+  <InputEncoding>utf-8</InputEncoding>
+  <Image width="16" height="16">data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAABGklEQVQoz2NgGB6AnZ1dUlJSXl4eSDIyMhLW4Ovr%2B%2Fr168uXL69Zs4YoG%2BLi4i5dusTExMTGxsbNzd3f37937976%2BnpmZmagbHR09J49e5YvX66kpATVEBYW9ubNm2nTphkbG7e2tp44cQLIuHfvXm5urpaWFlDKysqqu7v73LlzECMYIiIiHj58mJCQoKKicvXq1bS0NKBgW1vbjh074uPjgeqAXE1NzSdPnvDz84M0AEUvXLgAsW379u1z5swBen3jxo2zZ892cHB4%2BvQp0KlAfwI1cHJyghQFBwfv2rULokFXV%2FfixYu7d%2B8GGqGgoMDKyrpu3br9%2B%2FcDuXl5eVA%2FAEWBfoWHAdAYoNuAYQ0XAeoUERFhGDYAAPoUaT2dfWJuAAAAAElFTkSuQmCC</Image>
+  <Url type="text/html" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/?search">
+    <Param name="test" value="{searchTerms}"/>
+  </Url>
+  <moz:SearchForm>http://mochi.test:8888/browser/browser/components/search/test/browser/</moz:SearchForm>
+  <moz:Alias>diacriticalias</moz:Alias>
+</OpenSearchDescription>
diff --git a/browser/components/search/test/browser/testEngine_dupe.xml b/browser/components/search/test/browser/testEngine_dupe.xml
new file mode 100644
index 0000000000..86c4cfadaf
--- /dev/null
+++ b/browser/components/search/test/browser/testEngine_dupe.xml
@@ -0,0 +1,12 @@
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/"
+                       xmlns:moz="http://www.mozilla.org/2006/browser/search/">
+  <ShortName>FooDupe</ShortName>
+  <Description>Second Engine Search</Description>
+  <InputEncoding>utf-8</InputEncoding>
+  <Image width="16" height="16">data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAABGklEQVQoz2NgGB6AnZ1dUlJSXl4eSDIyMhLW4Ovr%2B%2Fr168uXL69Zs4YoG%2BLi4i5dusTExMTGxsbNzd3f37937976%2BnpmZmagbHR09J49e5YvX66kpATVEBYW9ubNm2nTphkbG7e2tp44cQLIuHfvXm5urpaWFlDKysqqu7v73LlzECMYIiIiHj58mJCQoKKicvXq1bS0NKBgW1vbjh074uPjgeqAXE1NzSdPnvDz84M0AEUvXLgAsW379u1z5swBen3jxo2zZ892cHB4%2BvQp0KlAfwI1cHJyghQFBwfv2rULokFXV%2FfixYu7d%2B8GGqGgoMDKyrpu3br9%2B%2FcDuXl5eVA%2FAEWBfoWHAdAYoNuAYQ0XAeoUERFhGDYAAPoUaT2dfWJuAAAAAElFTkSuQmCC</Image>
+  <Url type="text/html" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/?search">
+    <Param name="test" value="{searchTerms}"/>
+  </Url>
+  <moz:SearchForm>http://mochi.test:8888/browser/browser/components/search/test/browser/</moz:SearchForm>
+  <moz:Alias>secondalias</moz:Alias>
+</OpenSearchDescription>
diff --git a/browser/components/search/test/browser/testEngine_mozsearch.xml b/browser/components/search/test/browser/testEngine_mozsearch.xml
new file mode 100644
index 0000000000..2f285feb4c
--- /dev/null
+++ b/browser/components/search/test/browser/testEngine_mozsearch.xml
@@ -0,0 +1,14 @@
+<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
+  <ShortName>Foo</ShortName>
+  <Description>Foo Search</Description>
+  <InputEncoding>utf-8</InputEncoding>
+  <Image width="16" height="16">data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAABGklEQVQoz2NgGB6AnZ1dUlJSXl4eSDIyMhLW4Ovr%2B%2Fr168uXL69Zs4YoG%2BLi4i5dusTExMTGxsbNzd3f37937976%2BnpmZmagbHR09J49e5YvX66kpATVEBYW9ubNm2nTphkbG7e2tp44cQLIuHfvXm5urpaWFlDKysqqu7v73LlzECMYIiIiHj58mJCQoKKicvXq1bS0NKBgW1vbjh074uPjgeqAXE1NzSdPnvDz84M0AEUvXLgAsW379u1z5swBen3jxo2zZ892cHB4%2BvQp0KlAfwI1cHJyghQFBwfv2rULokFXV%2FfixYu7d%2B8GGqGgoMDKyrpu3br9%2B%2FcDuXl5eVA%2FAEWBfoWHAdAYoNuAYQ0XAeoUERFhGDYAAPoUaT2dfWJuAAAAAElFTkSuQmCC</Image>
+  <Url type="application/x-suggestions+json" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/?suggestions&amp;locale={moz:locale}&amp;test={searchTerms}"/>
+  <Url type="text/html" method="GET" template="http://mochi.test:8888/browser/browser/components/search/test/browser/">
+    <Param name="test" value="{searchTerms}"/>
+    <Param name="ie" value="utf-8"/>
+    <MozParam name="channel" condition="purpose" purpose="keyword" value="keywordsearch"/>
+    <MozParam name="channel" condition="purpose" purpose="contextmenu" value="contextsearch"/>
+  </Url>
+  <SearchForm>http://mochi.test:8888/browser/browser/components/search/test/browser/</SearchForm>
+</SearchPlugin>
diff --git a/browser/components/search/test/browser/test_search.html b/browser/components/search/test/browser/test_search.html
new file mode 100644
index 0000000000..010d1fdc82
--- /dev/null
+++ b/browser/components/search/test/browser/test_search.html
@@ -0,0 +1 @@
+test%20search
diff --git a/browser/components/search/test/browser/tooManyEnginesOffered.html b/browser/components/search/test/browser/tooManyEnginesOffered.html
new file mode 100644
index 0000000000..64e48d05e9
--- /dev/null
+++ b/browser/components/search/test/browser/tooManyEnginesOffered.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<link rel="search" type="application/opensearchdescription+xml" title="engine1" href="http://mochi.test:8888/browser/browser/components/search/test/browser/engine1.xml">
+<link rel="search" type="application/opensearchdescription+xml" title="engine2" href="http://mochi.test:8888/browser/browser/components/search/test/browser/engine2.xml">
+<link rel="search" type="application/opensearchdescription+xml" title="engine3" href="http://mochi.test:8888/browser/browser/components/search/test/browser/engine3.xml">
+<link rel="search" type="application/opensearchdescription+xml" title="engine4" href="http://mochi.test:8888/browser/browser/components/search/test/browser/engine4.xml">
+<link rel="search" type="application/opensearchdescription+xml" title="engine5" href="http://mochi.test:8888/browser/browser/components/search/test/browser/engine5.xml">
+<link rel="search" type="application/opensearchdescription+xml" title="engine6" href="http://mochi.test:8888/browser/browser/components/search/test/browser/engine6.xml">
+</head>
+<body></body>
+</html>
diff --git a/browser/components/search/test/browser/trendingSuggestionEngine.sjs b/browser/components/search/test/browser/trendingSuggestionEngine.sjs
new file mode 100644
index 0000000000..358d2a6077
--- /dev/null
+++ b/browser/components/search/test/browser/trendingSuggestionEngine.sjs
@@ -0,0 +1,54 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+let gTimer;
+
+function handleRequest(req, resp) {
+  // Parse the query params.  If the params aren't in the form "foo=bar", then
+  // treat the entire query string as a search string.
+  let params = req.queryString.split("&").reduce((memo, pair) => {
+    let [key, val] = pair.split("=");
+    if (!val) {
+      // This part isn't in the form "foo=bar".  Treat it as the search string
+      // (the "query").
+      val = key;
+      key = "query";
+    }
+    memo[decode(key)] = decode(val);
+    return memo;
+  }, {});
+
+  writeResponse(params, resp);
+}
+
+function writeResponse(params, resp) {
+  // Echoes back 15 results, query, query0, query1, query2 etc.
+  let query = params.query || "";
+  let suffixes = [...Array(15).keys()].map(s => query + s);
+  // If we have a query, echo it back (to help test deduplication)
+  if (query) {
+    suffixes.unshift(query);
+  }
+  let data = [query, suffixes];
+
+  if (params?.richsuggestions) {
+    data.push([]);
+    data.push({
+      "google:suggestdetail": data[1].map(() => ({
+        a: "Extended title",
+        dc: "#FFFFFF",
+        i: "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==",
+        t: "Title",
+      })),
+    });
+  }
+  resp.setHeader("Content-Type", "application/json", false);
+
+  let json = JSON.stringify(data);
+  let utf8 = String.fromCharCode(...new TextEncoder().encode(json));
+  resp.write(utf8);
+}
+
+function decode(str) {
+  return decodeURIComponent(str.replace(/\+/g, encodeURIComponent(" ")));
+}
diff --git a/browser/components/search/test/marionette/manifest.toml b/browser/components/search/test/marionette/manifest.toml
new file mode 100644
index 0000000000..152442bc5b
--- /dev/null
+++ b/browser/components/search/test/marionette/manifest.toml
@@ -0,0 +1,4 @@
+[DEFAULT]
+run-if = ["buildapp == 'browser'"]
+
+["test_engines_on_restart.py"]
diff --git a/browser/components/search/test/marionette/test_engines_on_restart.py b/browser/components/search/test/marionette/test_engines_on_restart.py
new file mode 100644
index 0000000000..d7a0634e75
--- /dev/null
+++ b/browser/components/search/test/marionette/test_engines_on_restart.py
@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import textwrap
+
+from marionette_harness.marionette_test import MarionetteTestCase
+
+
+class TestEnginesOnRestart(MarionetteTestCase):
+    def setUp(self):
+        super(TestEnginesOnRestart, self).setUp()
+        self.marionette.enforce_gecko_prefs(
+            {
+                "browser.search.log": True,
+            }
+        )
+
+    def get_default_search_engine(self):
+        """Retrieve the identifier of the default search engine."""
+
+        script = """\
+        let [resolve] = arguments;
+        let searchService = Components.classes[
+                "@mozilla.org/browser/search-service;1"]
+            .getService(Components.interfaces.nsISearchService);
+        return searchService.init().then(function () {
+          resolve(searchService.defaultEngine.identifier);
+        });
+        """
+
+        with self.marionette.using_context(self.marionette.CONTEXT_CHROME):
+            return self.marionette.execute_async_script(textwrap.dedent(script))
+
+    def test_engines(self):
+        self.assertTrue(self.get_default_search_engine().startswith("google"))
+        self.marionette.set_pref("intl.locale.requested", "kk_KZ")
+        self.marionette.restart(clean=False, in_app=True)
+        self.assertTrue(self.get_default_search_engine().startswith("google"))
diff --git a/browser/components/search/test/unit/domain_category_mappings_1a.json b/browser/components/search/test/unit/domain_category_mappings_1a.json
new file mode 100644
index 0000000000..51b18e12a7
--- /dev/null
+++ b/browser/components/search/test/unit/domain_category_mappings_1a.json
@@ -0,0 +1,3 @@
+{
+  "Wrq9YDsieAMC3Y2DSY5Rcg==": [1, 100]
+}
diff --git a/browser/components/search/test/unit/domain_category_mappings_1b.json b/browser/components/search/test/unit/domain_category_mappings_1b.json
new file mode 100644
index 0000000000..698ef45f1a
--- /dev/null
+++ b/browser/components/search/test/unit/domain_category_mappings_1b.json
@@ -0,0 +1,3 @@
+{
+  "G99y4E1rUMgqSMfk3TjMaQ==": [2, 90]
+}
diff --git a/browser/components/search/test/unit/domain_category_mappings_2a.json b/browser/components/search/test/unit/domain_category_mappings_2a.json
new file mode 100644
index 0000000000..08db2fa8c2
--- /dev/null
+++ b/browser/components/search/test/unit/domain_category_mappings_2a.json
@@ -0,0 +1,3 @@
+{
+  "Wrq9YDsieAMC3Y2DSY5Rcg==": [1, 80]
+}
diff --git a/browser/components/search/test/unit/domain_category_mappings_2b.json b/browser/components/search/test/unit/domain_category_mappings_2b.json
new file mode 100644
index 0000000000..dec2d130c1
--- /dev/null
+++ b/browser/components/search/test/unit/domain_category_mappings_2b.json
@@ -0,0 +1,3 @@
+{
+  "G99y4E1rUMgqSMfk3TjMaQ==": [2, 50, 4, 80]
+}
diff --git a/browser/components/search/test/unit/test_search_telemetry_categorization_logic.js b/browser/components/search/test/unit/test_search_telemetry_categorization_logic.js
new file mode 100644
index 0000000000..947a7aae46
--- /dev/null
+++ b/browser/components/search/test/unit/test_search_telemetry_categorization_logic.js
@@ -0,0 +1,346 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * This test ensures we are correctly applying the SERP categorization logic to
+ * the domains that have been extracted from the SERP.
+ */
+
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  SearchSERPCategorization: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPDomainToCategoriesMap:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPTelemetryUtils: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+});
+
+const TEST_DOMAIN_TO_CATEGORIES_MAP_SIMPLE = {
+  "byVQ4ej7T7s2xf/cPqgMyw==": [2, 90],
+  "1TEnSjgNCuobI6olZinMiQ==": [2, 95],
+  "/Bnju09b9iBPjg7K+5ENIw==": [2, 78, 4, 10],
+  "Ja6RJq5LQftdl7NQrX1avQ==": [2, 56, 4, 24],
+  "Jy26Qt99JrUderAcURtQ5A==": [2, 89],
+  "sZnJyyzY9QcN810Q6jfbvw==": [2, 43],
+  "QhmteGKeYk0okuB/bXzwRw==": [2, 65],
+  "CKQZZ1IJjzjjE4LUV8vUSg==": [2, 67],
+  "FK7mL5E1JaE6VzOiGMmlZg==": [2, 89],
+  "mzcR/nhDcrs0ed4kTf+ZFg==": [2, 99],
+};
+
+const TEST_DOMAIN_TO_CATEGORIES_MAP_INCONCLUSIVE = {
+  "IkOfhoSlHTMIZzWXkYf7fg==": [0, 0],
+  "PIAHxeaBOeDNY2tvZKqQuw==": [0, 0],
+  "DKx2mqmFtEvxrHAqpwSevA==": [0, 0],
+  "DlZKnz9ryYqbxJq9wodzlA==": [0, 0],
+  "n3NWT4N9JlKX0I7MUtAsYg==": [0, 0],
+  "A6KyupOlu5zXt8loti90qw==": [0, 0],
+  "gf5rpseruOaq8nXOSJPG3Q==": [0, 0],
+  "vlQYOvbcbAp6sMx54OwqCQ==": [0, 0],
+  "8PcaPATLgmHD9SR0/961Sw==": [0, 0],
+  "l+hLycEAW2v/OPE/XFpNwQ==": [0, 0],
+};
+
+const TEST_DOMAIN_TO_CATEGORIES_MAP_UNKNOWN_AND_INCONCLUSIVE = {
+  "CEA642T3hV+Fdi2PaRH9BQ==": [0, 0],
+  "cVqopYLASYxcWdDW4F+w2w==": [0, 0],
+  "X61OdTU20n8pxZ76K2eAHg==": [0, 0],
+  "/srrOggOAwgaBGCsPdC4bA==": [0, 0],
+  "onnMGn+MmaCQx3RNLBzGOQ==": [0, 0],
+};
+
+const TEST_DOMAIN_TO_CATEGORIES_MAP_ALL_TYPES = {
+  "VSXaqgDKYWrJ/yjsFomUdg==": [3, 90],
+  "6re74Kk34n2V6VCdLmCD5w==": [3, 88],
+  "s8gOGIaFnly5hHX7nPncnw==": [3, 90, 6, 2],
+  "zfRJyKV+2jd1RKNsSHm9pw==": [3, 78, 6, 7],
+  "zcW+KbRfLRO6Dljf5qnuwQ==": [3, 97],
+  "Rau9mfbBcIRiRQIliUxkow==": [0, 0],
+  "4AFhUOmLQ8804doOsI4jBA==": [0, 0],
+};
+
+const TEST_DOMAIN_TO_CATEGORIES_MAP_TIE = {
+  "fmEqRSc+pBr9noi0l99nGw==": [1, 50, 2, 50],
+  "cms8ipz0JQ3WS9o48RtvnQ==": [1, 50, 2, 50],
+  "y8Haj7Qdmx+k762RaxCPvA==": [1, 50, 2, 50],
+  "tCbLmi5xJ/OrF8tbRm8PrA==": [1, 50, 2, 50],
+  "uYNQECmDShqI409HrSTdLQ==": [1, 50, 2, 50],
+  "D88hdsmzLWIXYhkrDal33w==": [3, 50, 4, 50],
+  "1mhx0I0B4cEaI91x8zor7Q==": [5, 50, 6, 50],
+  "dVZYATQixuBHmalCFR9+Lw==": [7, 50, 8, 50],
+  "pdOFJG49D7hE/+FtsWDihQ==": [9, 50, 10, 50],
+  "+gl+dBhWE0nx0AM69m2g5w==": [11, 50, 12, 50],
+};
+
+const TEST_DOMAIN_TO_CATEGORIES_MAP_RANK_PENALIZATION_1 = {
+  "VSXaqgDKYWrJ/yjsFomUdg==": [1, 45],
+  "6re74Kk34n2V6VCdLmCD5w==": [2, 45],
+  "s8gOGIaFnly5hHX7nPncnw==": [3, 45],
+  "zfRJyKV+2jd1RKNsSHm9pw==": [4, 45],
+  "zcW+KbRfLRO6Dljf5qnuwQ==": [5, 45],
+  "Rau9mfbBcIRiRQIliUxkow==": [6, 45],
+  "4AFhUOmLQ8804doOsI4jBA==": [7, 45],
+  "YZ3aEL73MR+Cjog0D7A24w==": [8, 45],
+  "crMclD9rwInEQ30DpZLg+g==": [9, 45],
+  "/r7oPRoE6LJAE95nuwmu7w==": [10, 45],
+};
+
+const TEST_DOMAIN_TO_CATEGORIES_MAP_RANK_PENALIZATION_2 = {
+  "sHWSmFwSYL3snycBZCY8Kg==": [1, 35, 2, 4],
+  "FZ5zPYh6ByI0KGWKkmpDoA==": [1, 5, 2, 94],
+};
+
+add_setup(async () => {
+  Services.prefs.setBoolPref(
+    "browser.search.serpEventTelemetryCategorization.enabled",
+    true
+  );
+});
+
+add_task(async function test_categorization_simple() {
+  SearchSERPDomainToCategoriesMap.overrideMapForTests(
+    TEST_DOMAIN_TO_CATEGORIES_MAP_SIMPLE
+  );
+
+  let domains = new Set([
+    "test1.com",
+    "test2.com",
+    "test3.com",
+    "test4.com",
+    "test5.com",
+    "test6.com",
+    "test7.com",
+    "test8.com",
+    "test9.com",
+    "test10.com",
+  ]);
+
+  let resultsToReport =
+    SearchSERPCategorization.applyCategorizationLogic(domains);
+
+  Assert.deepEqual(
+    resultsToReport,
+    { category: "2", num_domains: 10, num_inconclusive: 0, num_unknown: 0 },
+    "Should report the correct values for categorizing the SERP."
+  );
+});
+
+add_task(async function test_categorization_inconclusive() {
+  SearchSERPDomainToCategoriesMap.overrideMapForTests(
+    TEST_DOMAIN_TO_CATEGORIES_MAP_INCONCLUSIVE
+  );
+
+  let domains = new Set([
+    "test11.com",
+    "test12.com",
+    "test13.com",
+    "test14.com",
+    "test15.com",
+    "test16.com",
+    "test17.com",
+    "test18.com",
+    "test19.com",
+    "test20.com",
+  ]);
+
+  let resultsToReport =
+    SearchSERPCategorization.applyCategorizationLogic(domains);
+
+  Assert.deepEqual(
+    resultsToReport,
+    {
+      category: SearchSERPTelemetryUtils.CATEGORIZATION.INCONCLUSIVE,
+      num_domains: 10,
+      num_inconclusive: 10,
+      num_unknown: 0,
+    },
+    "Should report the correct values for categorizing the SERP."
+  );
+});
+
+add_task(async function test_categorization_unknown() {
+  // Reusing TEST_DOMAIN_TO_CATEGORIES_MAP_SIMPLE since none of this task's
+  // domains will be keys within it.
+  SearchSERPDomainToCategoriesMap.overrideMapForTests(
+    TEST_DOMAIN_TO_CATEGORIES_MAP_SIMPLE
+  );
+
+  let domains = new Set([
+    "test21.com",
+    "test22.com",
+    "test23.com",
+    "test24.com",
+    "test25.com",
+    "test26.com",
+    "test27.com",
+    "test28.com",
+    "test29.com",
+    "test30.com",
+  ]);
+
+  let resultsToReport =
+    SearchSERPCategorization.applyCategorizationLogic(domains);
+
+  Assert.deepEqual(
+    resultsToReport,
+    {
+      category: SearchSERPTelemetryUtils.CATEGORIZATION.INCONCLUSIVE,
+      num_domains: 10,
+      num_inconclusive: 0,
+      num_unknown: 10,
+    },
+    "Should report the correct values for categorizing the SERP."
+  );
+});
+
+add_task(async function test_categorization_unknown_and_inconclusive() {
+  SearchSERPDomainToCategoriesMap.overrideMapForTests(
+    TEST_DOMAIN_TO_CATEGORIES_MAP_UNKNOWN_AND_INCONCLUSIVE
+  );
+
+  let domains = new Set([
+    "test31.com",
+    "test32.com",
+    "test33.com",
+    "test34.com",
+    "test35.com",
+    "test36.com",
+    "test37.com",
+    "test38.com",
+    "test39.com",
+    "test40.com",
+  ]);
+
+  let resultsToReport =
+    SearchSERPCategorization.applyCategorizationLogic(domains);
+
+  Assert.deepEqual(
+    resultsToReport,
+    {
+      category: SearchSERPTelemetryUtils.CATEGORIZATION.INCONCLUSIVE,
+      num_domains: 10,
+      num_inconclusive: 5,
+      num_unknown: 5,
+    },
+    "Should report the correct values for categorizing the SERP."
+  );
+});
+
+// Tests a mixture of categorized, inconclusive and unknown domains.
+add_task(async function test_categorization_all_types() {
+  SearchSERPDomainToCategoriesMap.overrideMapForTests(
+    TEST_DOMAIN_TO_CATEGORIES_MAP_ALL_TYPES
+  );
+
+  // First 5 domains are categorized, 6th and 7th are inconclusive and the last
+  // 3 are unknown.
+  let domains = new Set([
+    "test51.com",
+    "test52.com",
+    "test53.com",
+    "test54.com",
+    "test55.com",
+    "test56.com",
+    "test57.com",
+    "test58.com",
+    "test59.com",
+    "test60.com",
+  ]);
+
+  let resultsToReport =
+    SearchSERPCategorization.applyCategorizationLogic(domains);
+
+  Assert.deepEqual(
+    resultsToReport,
+    {
+      category: "3",
+      num_domains: 10,
+      num_inconclusive: 2,
+      num_unknown: 3,
+    },
+    "Should report the correct values for categorizing the SERP."
+  );
+});
+
+add_task(async function test_categorization_tie() {
+  SearchSERPDomainToCategoriesMap.overrideMapForTests(
+    TEST_DOMAIN_TO_CATEGORIES_MAP_TIE
+  );
+
+  let domains = new Set([
+    "test41.com",
+    "test42.com",
+    "test43.com",
+    "test44.com",
+    "test45.com",
+    "test46.com",
+    "test47.com",
+    "test48.com",
+    "test49.com",
+    "test50.com",
+  ]);
+
+  let resultsToReport =
+    SearchSERPCategorization.applyCategorizationLogic(domains);
+
+  Assert.equal(
+    [1, 2].includes(resultsToReport.category),
+    true,
+    "Category should be one of the 2 categories with the max score."
+  );
+  delete resultsToReport.category;
+  Assert.deepEqual(
+    resultsToReport,
+    {
+      num_domains: 10,
+      num_inconclusive: 0,
+      num_unknown: 0,
+    },
+    "Should report the correct counts for the various domain types."
+  );
+});
+
+add_task(async function test_rank_penalization_equal_scores() {
+  SearchSERPDomainToCategoriesMap.overrideMapForTests(
+    TEST_DOMAIN_TO_CATEGORIES_MAP_RANK_PENALIZATION_1
+  );
+
+  let domains = new Set([
+    "test51.com",
+    "test52.com",
+    "test53.com",
+    "test54.com",
+    "test55.com",
+    "test56.com",
+    "test57.com",
+    "test58.com",
+    "test59.com",
+    "test60.com",
+  ]);
+
+  let resultsToReport =
+    SearchSERPCategorization.applyCategorizationLogic(domains);
+
+  Assert.deepEqual(
+    resultsToReport,
+    { category: "1", num_domains: 10, num_inconclusive: 0, num_unknown: 0 },
+    "Should report the correct values for categorizing the SERP."
+  );
+});
+
+add_task(async function test_rank_penalization_highest_score_lower_on_page() {
+  SearchSERPDomainToCategoriesMap.overrideMapForTests(
+    TEST_DOMAIN_TO_CATEGORIES_MAP_RANK_PENALIZATION_2
+  );
+
+  let domains = new Set(["test61.com", "test62.com"]);
+
+  let resultsToReport =
+    SearchSERPCategorization.applyCategorizationLogic(domains);
+
+  Assert.deepEqual(
+    resultsToReport,
+    { category: "2", num_domains: 2, num_inconclusive: 0, num_unknown: 0 },
+    "Should report the correct values for categorizing the SERP."
+  );
+});
diff --git a/browser/components/search/test/unit/test_search_telemetry_categorization_process_domains.js b/browser/components/search/test/unit/test_search_telemetry_categorization_process_domains.js
new file mode 100644
index 0000000000..84acedaa7a
--- /dev/null
+++ b/browser/components/search/test/unit/test_search_telemetry_categorization_process_domains.js
@@ -0,0 +1,89 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * This test ensures we are correctly processing the domains that have been
+ * extracted from a SERP.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  BrowserSearchTelemetry: "resource:///modules/BrowserSearchTelemetry.sys.mjs",
+  SearchSERPCategorization: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPTelemetry: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+  sinon: "resource://testing-common/Sinon.sys.mjs",
+});
+
+// Links including the provider name are not extracted.
+const PROVIDER = "example";
+
+const TESTS = [
+  {
+    title: "Domains matching the provider.",
+    domains: ["example.com", "www.example.com", "www.foobar.com"],
+    expected: ["foobar.com"],
+  },
+  {
+    title: "Second-level domains to a top-level domain.",
+    domains: [
+      "www.foobar.gc.ca",
+      "www.foobar.gov.uk",
+      "foobar.co.uk",
+      "www.foobar.co.il",
+    ],
+    expected: ["foobar.gc.ca", "foobar.gov.uk", "foobar.co.uk", "foobar.co.il"],
+  },
+  {
+    title: "Long subdomain.",
+    domains: ["ab.cd.ef.gh.foobar.com"],
+    expected: ["foobar.com"],
+  },
+  {
+    title: "Same top-level domain.",
+    domains: ["foobar.com", "www.foobar.com", "abc.def.foobar.com"],
+    expected: ["foobar.com"],
+  },
+  {
+    title: "Empty input.",
+    domains: [""],
+    expected: [],
+  },
+];
+
+add_setup(async function () {
+  Services.prefs.setBoolPref(
+    SearchUtils.BROWSER_SEARCH_PREF + "serpEventTelemetry.enabled",
+    true
+  );
+  Services.prefs.setBoolPref(
+    SearchUtils.BROWSER_SEARCH_PREF +
+      "serpEventTelemetryCategorization.enabled",
+    true
+  );
+
+  // Required or else BrowserSearchTelemetry will throw.
+  sinon.stub(BrowserSearchTelemetry, "shouldRecordSearchCount").returns(true);
+  await SearchSERPTelemetry.init();
+});
+
+add_task(async function test_parsing_extracted_urls() {
+  for (let i = 0; i < TESTS.length; i++) {
+    let currentTest = TESTS[i];
+    let domains = new Set(currentTest.domains);
+
+    if (currentTest.title) {
+      info(currentTest.title);
+    }
+    let expectedDomains = new Set(currentTest.expected);
+    let actualDomains = SearchSERPCategorization.processDomains(
+      domains,
+      PROVIDER
+    );
+
+    Assert.deepEqual(
+      Array.from(actualDomains),
+      Array.from(expectedDomains),
+      "Domains should have been parsed correctly."
+    );
+  }
+});
diff --git a/browser/components/search/test/unit/test_search_telemetry_categorization_sync.js b/browser/components/search/test/unit/test_search_telemetry_categorization_sync.js
new file mode 100644
index 0000000000..423ee0a81d
--- /dev/null
+++ b/browser/components/search/test/unit/test_search_telemetry_categorization_sync.js
@@ -0,0 +1,423 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests the integration of Remote Settings with SERP domain categorization.
+ */
+
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  RemoteSettings: "resource://services-settings/remote-settings.sys.mjs",
+  SearchSERPDomainToCategoriesMap:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  TELEMETRY_CATEGORIZATION_KEY:
+    "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  TestUtils: "resource://testing-common/TestUtils.sys.mjs",
+});
+
+async function waitForDomainToCategoriesUpdate() {
+  return TestUtils.topicObserved("domain-to-categories-map-update-complete");
+}
+
+async function mockRecordWithCachedAttachment({ id, version, filename }) {
+  // Get the bytes of the file for the hash and size for attachment metadata.
+  let data = await IOUtils.readUTF8(
+    PathUtils.join(do_get_cwd().path, filename)
+  );
+  let buffer = new TextEncoder().encode(data).buffer;
+  let stream = Cc["@mozilla.org/io/arraybuffer-input-stream;1"].createInstance(
+    Ci.nsIArrayBufferInputStream
+  );
+  stream.setData(buffer, 0, buffer.byteLength);
+
+  // Generate a hash.
+  let hasher = Cc["@mozilla.org/security/hash;1"].createInstance(
+    Ci.nsICryptoHash
+  );
+  hasher.init(Ci.nsICryptoHash.SHA256);
+  hasher.updateFromStream(stream, -1);
+  let hash = hasher.finish(false);
+  hash = Array.from(hash, (_, i) =>
+    ("0" + hash.charCodeAt(i).toString(16)).slice(-2)
+  ).join("");
+
+  let record = {
+    id,
+    version,
+    attachment: {
+      hash,
+      location: `main-workspace/search-categorization/${filename}`,
+      filename,
+      size: buffer.byteLength,
+      mimetype: "application/json",
+    },
+  };
+
+  client.attachments.cacheImpl.set(id, {
+    record,
+    blob: new Blob([buffer]),
+  });
+
+  return record;
+}
+
+const RECORD_A_ID = Services.uuid.generateUUID().number.slice(1, -1);
+const RECORD_B_ID = Services.uuid.generateUUID().number.slice(1, -1);
+
+const client = RemoteSettings(TELEMETRY_CATEGORIZATION_KEY);
+const db = client.db;
+
+const RECORDS = {
+  record1a: {
+    id: RECORD_A_ID,
+    version: 1,
+    filename: "domain_category_mappings_1a.json",
+  },
+  record1b: {
+    id: RECORD_B_ID,
+    version: 1,
+    filename: "domain_category_mappings_1b.json",
+  },
+  record2a: {
+    id: RECORD_A_ID,
+    version: 2,
+    filename: "domain_category_mappings_2a.json",
+  },
+  record2b: {
+    id: RECORD_B_ID,
+    version: 2,
+    filename: "domain_category_mappings_2b.json",
+  },
+};
+
+add_setup(async () => {
+  // Testing with Remote Settings requires a profile.
+  do_get_profile();
+  await db.clear();
+});
+
+add_task(async function test_initial_import() {
+  info("Create record containing domain_category_mappings_1a.json attachment.");
+  let record1a = await mockRecordWithCachedAttachment(RECORDS.record1a);
+  await db.create(record1a);
+
+  info("Create record containing domain_category_mappings_1b.json attachment.");
+  let record1b = await mockRecordWithCachedAttachment(RECORDS.record1b);
+  await db.create(record1b);
+
+  info("Add data to Remote Settings DB.");
+  await db.importChanges({}, Date.now());
+
+  info("Initialize search categorization mappings.");
+  let promise = waitForDomainToCategoriesUpdate();
+  await SearchSERPDomainToCategoriesMap.init();
+  await promise;
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.com"),
+    [{ category: 1, score: 100 }],
+    "Return value from lookup of example.com should be the same."
+  );
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.org"),
+    [{ category: 2, score: 90 }],
+    "Return value from lookup of example.org should be the same."
+  );
+
+  // Clean up.
+  await db.clear();
+  SearchSERPDomainToCategoriesMap.uninit();
+});
+
+add_task(async function test_update_records() {
+  info("Create record containing domain_category_mappings_1a.json attachment.");
+  let record1a = await mockRecordWithCachedAttachment(RECORDS.record1a);
+  await db.create(record1a);
+
+  info("Create record containing domain_category_mappings_1b.json attachment.");
+  let record1b = await mockRecordWithCachedAttachment(RECORDS.record1b);
+  await db.create(record1b);
+
+  info("Add data to Remote Settings DB.");
+  await db.importChanges({}, Date.now());
+
+  info("Initialize search categorization mappings.");
+  let promise = waitForDomainToCategoriesUpdate();
+  await SearchSERPDomainToCategoriesMap.init();
+  await promise;
+
+  info("Send update from Remote Settings with updates to attachments.");
+  let record2a = await mockRecordWithCachedAttachment(RECORDS.record2a);
+  let record2b = await mockRecordWithCachedAttachment(RECORDS.record2b);
+  const payload = {
+    current: [record2a, record2b],
+    created: [],
+    updated: [
+      { old: record1a, new: record2a },
+      { old: record1b, new: record2b },
+    ],
+    deleted: [],
+  };
+  promise = waitForDomainToCategoriesUpdate();
+  await client.emit("sync", {
+    data: payload,
+  });
+  await promise;
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.com"),
+    [{ category: 1, score: 80 }],
+    "Return value from lookup of example.com should have changed."
+  );
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.org"),
+    [
+      { category: 2, score: 50 },
+      { category: 4, score: 80 },
+    ],
+    "Return value from lookup of example.org should have changed."
+  );
+
+  Assert.equal(
+    SearchSERPDomainToCategoriesMap.version,
+    2,
+    "Version should be correct."
+  );
+
+  // Clean up.
+  await db.clear();
+  SearchSERPDomainToCategoriesMap.uninit();
+});
+
+add_task(async function test_delayed_initial_import() {
+  info("Initialize search categorization mappings.");
+  let observeNoRecordsFound = TestUtils.consoleMessageObserved(msg => {
+    return (
+      typeof msg.wrappedJSObject.arguments?.[0] == "string" &&
+      msg.wrappedJSObject.arguments[0].includes(
+        "No records found for domain-to-categories map."
+      )
+    );
+  });
+  info("Initialize without records.");
+  await SearchSERPDomainToCategoriesMap.init();
+  await observeNoRecordsFound;
+
+  Assert.ok(SearchSERPDomainToCategoriesMap.empty, "Map is empty.");
+
+  info("Send update from Remote Settings with updates to attachments.");
+  let record1a = await mockRecordWithCachedAttachment(RECORDS.record1a);
+  let record1b = await mockRecordWithCachedAttachment(RECORDS.record1b);
+  const payload = {
+    current: [record1a, record1b],
+    created: [record1a, record1b],
+    updated: [],
+    deleted: [],
+  };
+  let promise = waitForDomainToCategoriesUpdate();
+  await client.emit("sync", {
+    data: payload,
+  });
+  await promise;
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.com"),
+    [{ category: 1, score: 100 }],
+    "Return value from lookup of example.com should be the same."
+  );
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.org"),
+    [{ category: 2, score: 90 }],
+    "Return value from lookup of example.org should be the same."
+  );
+
+  Assert.equal(
+    SearchSERPDomainToCategoriesMap.version,
+    1,
+    "Version should be correct."
+  );
+
+  // Clean up.
+  await db.clear();
+  SearchSERPDomainToCategoriesMap.uninit();
+});
+
+add_task(async function test_remove_record() {
+  info("Create record containing domain_category_mappings_2a.json attachment.");
+  let record2a = await mockRecordWithCachedAttachment(RECORDS.record2a);
+  await db.create(record2a);
+
+  info("Create record containing domain_category_mappings_2b.json attachment.");
+  let record2b = await mockRecordWithCachedAttachment(RECORDS.record2b);
+  await db.create(record2b);
+
+  info("Add data to Remote Settings DB.");
+  await db.importChanges({}, Date.now());
+
+  info("Initialize search categorization mappings.");
+  let promise = waitForDomainToCategoriesUpdate();
+  await SearchSERPDomainToCategoriesMap.init();
+  await promise;
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.com"),
+    [{ category: 1, score: 80 }],
+    "Initialized properly."
+  );
+
+  info("Send update from Remote Settings with one removed record.");
+  const payload = {
+    current: [record2a],
+    created: [],
+    updated: [],
+    deleted: [record2b],
+  };
+  promise = waitForDomainToCategoriesUpdate();
+  await client.emit("sync", {
+    data: payload,
+  });
+  await promise;
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.com"),
+    [{ category: 1, score: 80 }],
+    "Return value from lookup of example.com should remain unchanged."
+  );
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.org"),
+    [],
+    "Return value from lookup of example.org should be empty."
+  );
+
+  Assert.equal(
+    SearchSERPDomainToCategoriesMap.version,
+    2,
+    "Version should be correct."
+  );
+
+  // Clean up.
+  await db.clear();
+  SearchSERPDomainToCategoriesMap.uninit();
+});
+
+add_task(async function test_different_versions_coexisting() {
+  info("Create record containing domain_category_mappings_1a.json attachment.");
+  let record1a = await mockRecordWithCachedAttachment(RECORDS.record1a);
+  await db.create(record1a);
+
+  info("Create record containing domain_category_mappings_2b.json attachment.");
+  let record2b = await mockRecordWithCachedAttachment(RECORDS.record2b);
+  await db.create(record2b);
+
+  info("Add data to Remote Settings DB.");
+  await db.importChanges({}, Date.now());
+
+  info("Initialize search categorization mappings.");
+  let promise = waitForDomainToCategoriesUpdate();
+  await SearchSERPDomainToCategoriesMap.init();
+  await promise;
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.com"),
+    [
+      {
+        category: 1,
+        score: 100,
+      },
+    ],
+    "Should have a record from an older version."
+  );
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.org"),
+    [
+      { category: 2, score: 50 },
+      { category: 4, score: 80 },
+    ],
+    "Return value from lookup of example.org should have the most recent value."
+  );
+
+  Assert.equal(
+    SearchSERPDomainToCategoriesMap.version,
+    2,
+    "Version should be the latest."
+  );
+
+  // Clean up.
+  await db.clear();
+  SearchSERPDomainToCategoriesMap.uninit();
+});
+
+add_task(async function test_download_error() {
+  info("Create record containing domain_category_mappings_1a.json attachment.");
+  let record1a = await mockRecordWithCachedAttachment(RECORDS.record1a);
+  await db.create(record1a);
+
+  info("Add data to Remote Settings DB.");
+  await db.importChanges({}, Date.now());
+
+  info("Initialize search categorization mappings.");
+  let promise = waitForDomainToCategoriesUpdate();
+  await SearchSERPDomainToCategoriesMap.init();
+  await promise;
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.com"),
+    [
+      {
+        category: 1,
+        score: 100,
+      },
+    ],
+    "Domain should have an entry in the map."
+  );
+
+  Assert.equal(
+    SearchSERPDomainToCategoriesMap.version,
+    1,
+    "Version should be present."
+  );
+
+  info("Delete attachment from local cache.");
+  client.attachments.cacheImpl.delete(RECORD_A_ID);
+
+  const payload = {
+    current: [record1a],
+    created: [],
+    updated: [record1a],
+    deleted: [],
+  };
+
+  info("Sync payload.");
+  let observeDownloadError = TestUtils.consoleMessageObserved(msg => {
+    return (
+      typeof msg.wrappedJSObject.arguments?.[0] == "string" &&
+      msg.wrappedJSObject.arguments[0].includes("Could not download file:")
+    );
+  });
+  await client.emit("sync", {
+    data: payload,
+  });
+  await observeDownloadError;
+
+  Assert.deepEqual(
+    SearchSERPDomainToCategoriesMap.get("example.com"),
+    [],
+    "Domain should not exist in store."
+  );
+
+  Assert.equal(
+    SearchSERPDomainToCategoriesMap.version,
+    null,
+    "Version should remain null."
+  );
+
+  // Clean up.
+  await db.clear();
+  SearchSERPDomainToCategoriesMap.uninit();
+});
diff --git a/browser/components/search/test/unit/test_search_telemetry_compare_urls.js b/browser/components/search/test/unit/test_search_telemetry_compare_urls.js
new file mode 100644
index 0000000000..c99c28607a
--- /dev/null
+++ b/browser/components/search/test/unit/test_search_telemetry_compare_urls.js
@@ -0,0 +1,188 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * This test ensures we compare URLs correctly. For more info on the scores,
+ * please read the function definition.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  SearchSERPTelemetry: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+});
+
+const TESTS = [
+  {
+    title: "No difference",
+    url1: "https://www.example.org/search?a=b&c=d#hash",
+    url2: "https://www.example.org/search?a=b&c=d#hash",
+    expected: Infinity,
+  },
+  {
+    // Since the ordering is different, a strict equality match is not going
+    // match. The score will be high, but not Infinity.
+    title: "Different ordering of query parameters",
+    url1: "https://www.example.org/search?c=d&a=b#hash",
+    url2: "https://www.example.org/search?a=b&c=d#hash",
+    expected: 7,
+  },
+  {
+    title: "Different protocol",
+    url1: "http://www.example.org/search",
+    url2: "https://www.example.org/search",
+    expected: 0,
+  },
+  {
+    title: "Different origin",
+    url1: "https://example.org/search",
+    url2: "https://www.example.org/search",
+    expected: 0,
+  },
+  {
+    title: "Different path",
+    url1: "https://www.example.org/serp",
+    url2: "https://www.example.org/search",
+    expected: 1,
+  },
+  {
+    title: "Different path, path on",
+    url1: "https://www.example.org/serp",
+    url2: "https://www.example.org/search",
+    options: {
+      path: true,
+    },
+    expected: 0,
+  },
+  {
+    title: "Different query parameter keys",
+    url1: "https://www.example.org/search?a=c",
+    url2: "https://www.example.org/search?b=c",
+    expected: 3,
+  },
+  {
+    title: "Different query parameter keys, paramValues on",
+    url1: "https://www.example.org/search?a=c",
+    url2: "https://www.example.org/search?b=c",
+    options: {
+      paramValues: true,
+    },
+    // Shouldn't change the score because the option should only nullify
+    // the result if one of the keys match but has different values.
+    expected: 3,
+  },
+  {
+    title: "Some different query parameter keys",
+    url1: "https://www.example.org/search?a=b&c=d",
+    url2: "https://www.example.org/search?a=b",
+    expected: 5,
+  },
+  {
+    title: "Some different query parameter keys, paramValues on",
+    url1: "https://www.example.org/search?a=b&c=d",
+    url2: "https://www.example.org/search?a=b",
+    options: {
+      paramValues: true,
+    },
+    // Shouldn't change the score because the option should only trigger
+    // if the keys match but values differ.
+    expected: 5,
+  },
+  {
+    title: "Different query parameter values",
+    url1: "https://www.example.org/search?a=b",
+    url2: "https://www.example.org/search?a=c",
+    expected: 4,
+  },
+  {
+    title: "Different query parameter values, paramValues on",
+    url1: "https://www.example.org/search?a=b&c=d",
+    url2: "https://www.example.org/search?a=b&c=e",
+    options: {
+      paramValues: true,
+    },
+    expected: 0,
+  },
+  {
+    title: "Some different query parameter values",
+    url1: "https://www.example.org/search?a=b&c=d",
+    url2: "https://www.example.org/search?a=b&c=e",
+    expected: 6,
+  },
+  {
+    title: "Different query parameter values, paramValues on",
+    url1: "https://www.example.org/search?a=b&c=d",
+    url2: "https://www.example.org/search?a=b&c=e",
+    options: {
+      paramValues: true,
+    },
+    expected: 0,
+  },
+  {
+    title: "Empty query parameter",
+    url1: "https://www.example.org/search?a=b&c",
+    url2: "https://www.example.org/search?c&a=b",
+    expected: 7,
+  },
+  {
+    title: "Empty query parameter, paramValues on",
+    url1: "https://www.example.org/search?a=b&c",
+    url2: "https://www.example.org/search?c&a=b",
+    options: {
+      paramValues: true,
+    },
+    expected: 7,
+  },
+  {
+    title: "Missing empty query parameter",
+    url1: "https://www.example.org/search?c&a=b",
+    url2: "https://www.example.org/search?a=b",
+    expected: 5,
+  },
+  {
+    title: "Missing empty query parameter, paramValues on",
+    url1: "https://www.example.org/search?c&a=b",
+    url2: "https://www.example.org/search?a=b",
+    options: {
+      paramValues: true,
+    },
+    expected: 5,
+  },
+  {
+    title: "Different empty query parameter",
+    url1: "https://www.example.org/search?c&a=b",
+    url2: "https://www.example.org/search?a=b&c=foo",
+    expected: 6,
+  },
+  {
+    title: "Different empty query parameter, paramValues on",
+    url1: "https://www.example.org/search?c&a=b",
+    url2: "https://www.example.org/search?a=b&c=foo",
+    options: {
+      paramValues: true,
+    },
+    expected: 0,
+  },
+];
+
+add_setup(async function () {
+  await SearchSERPTelemetry.init();
+});
+
+add_task(async function test_parsing_extracted_urls() {
+  for (let test of TESTS) {
+    info(test.title);
+    let result = SearchSERPTelemetry.compareUrls(
+      new URL(test.url1),
+      new URL(test.url2),
+      test.options
+    );
+    Assert.equal(result, test.expected, "Equality: url1, url2");
+
+    // Flip the URLs to ensure order doesn't matter.
+    result = SearchSERPTelemetry.compareUrls(
+      new URL(test.url2),
+      new URL(test.url1),
+      test.options
+    );
+    Assert.equal(result, test.expected, "Equality: url2, url1");
+  }
+});
diff --git a/browser/components/search/test/unit/test_search_telemetry_config_validation.js b/browser/components/search/test/unit/test_search_telemetry_config_validation.js
new file mode 100644
index 0000000000..8897b1e7c7
--- /dev/null
+++ b/browser/components/search/test/unit/test_search_telemetry_config_validation.js
@@ -0,0 +1,137 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+  RemoteSettings: "resource://services-settings/remote-settings.sys.mjs",
+  TELEMETRY_SETTINGS_KEY: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  JsonSchema: "resource://gre/modules/JsonSchema.sys.mjs",
+  SearchEngineSelector: "resource://gre/modules/SearchEngineSelector.sys.mjs",
+});
+
+/**
+ * Checks to see if a value is an object or not.
+ *
+ * @param {*} value
+ *   The value to check.
+ * @returns {boolean}
+ */
+function isObject(value) {
+  return value != null && typeof value == "object" && !Array.isArray(value);
+}
+
+/**
+ * This function modifies the schema to prevent allowing additional properties
+ * on objects. This is used to enforce that the schema contains everything that
+ * we deliver via the search configuration.
+ *
+ * These checks are not enabled in-product, as we want to allow older versions
+ * to keep working if we add new properties for whatever reason.
+ *
+ * @param {object} section
+ *   The section to check to see if an additionalProperties flag should be added.
+ */
+function disallowAdditionalProperties(section) {
+  // It is generally acceptable for new properties to be added to the
+  // configuration as older builds will ignore them.
+  //
+  // As a result, we only check for new properties on nightly builds, and this
+  // avoids us having to uplift schema changes. This also helps preserve the
+  // schemas as documentation of "what was supported in this version".
+  if (!AppConstants.NIGHTLY_BUILD) {
+    info("Skipping additional properties validation.");
+    return;
+  }
+
+  if (section.type == "object") {
+    section.additionalProperties = false;
+  }
+  for (let value of Object.values(section)) {
+    if (isObject(value)) {
+      disallowAdditionalProperties(value);
+    }
+  }
+}
+
+add_task(async function test_search_telemetry_validates_to_schema() {
+  let schema = await IOUtils.readJSON(
+    PathUtils.join(do_get_cwd().path, "search-telemetry-schema.json")
+  );
+  disallowAdditionalProperties(schema);
+
+  let data = await RemoteSettings(TELEMETRY_SETTINGS_KEY).get();
+
+  let validator = new JsonSchema.Validator(schema);
+
+  for (let entry of data) {
+    // Records in Remote Settings contain additional properties independent of
+    // the schema. Hence, we don't want to validate their presence.
+    delete entry.schema;
+    delete entry.id;
+    delete entry.last_modified;
+    delete entry.filter_expression;
+
+    let result = validator.validate(entry);
+    let message = `Should validate ${entry.telemetryId}`;
+    if (!result.valid) {
+      message += `:\n${JSON.stringify(result.errors, null, 2)}`;
+    }
+    Assert.ok(result.valid, message);
+  }
+});
+
+add_task(async function test_search_config_codes_in_search_telemetry() {
+  let searchTelemetry = await RemoteSettings(TELEMETRY_SETTINGS_KEY).get();
+
+  let selector = new SearchEngineSelector(() => {});
+  let searchConfig = await selector.getEngineConfiguration();
+
+  const telemetryIdToSearchEngineIdMap = new Map([["duckduckgo", "ddg"]]);
+
+  for (let telemetryEntry of searchTelemetry) {
+    info(`Checking: ${telemetryEntry.telemetryId}`);
+    let engine;
+    for (let entry of searchConfig) {
+      if (entry.recordType != "engine") {
+        continue;
+      }
+      if (
+        entry.identifier == telemetryEntry.telemetryId ||
+        entry.identifier ==
+          telemetryIdToSearchEngineIdMap.get(telemetryEntry.telemetryId)
+      ) {
+        engine = entry;
+      }
+    }
+    Assert.ok(
+      !!engine,
+      `Should have associated engine data for telemetry id ${telemetryEntry.telemetryId}`
+    );
+
+    if (engine.base.partnerCode) {
+      Assert.ok(
+        telemetryEntry.taggedCodes.includes(engine.base.partnerCode),
+        `Should have the base partner code ${engine.base.partnerCode} listed in the search telemetry 'taggedCodes'`
+      );
+    } else {
+      Assert.equal(
+        telemetryEntry.telemetryId,
+        "baidu",
+        "Should only not have a base partner code for Baidu"
+      );
+    }
+
+    if (engine.variants) {
+      for (let variant of engine.variants) {
+        if ("partnerCode" in variant) {
+          Assert.ok(
+            telemetryEntry.taggedCodes.includes(variant.partnerCode),
+            `Should have the partner code ${variant.partnerCode} listed in the search telemetry 'taggedCodes'`
+          );
+        }
+      }
+    }
+  }
+});
diff --git a/browser/components/search/test/unit/test_urlTelemetry.js b/browser/components/search/test/unit/test_urlTelemetry.js
new file mode 100644
index 0000000000..07f2407015
--- /dev/null
+++ b/browser/components/search/test/unit/test_urlTelemetry.js
@@ -0,0 +1,306 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  BrowserSearchTelemetry: "resource:///modules/BrowserSearchTelemetry.sys.mjs",
+  NetUtil: "resource://gre/modules/NetUtil.sys.mjs",
+  PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
+  SearchSERPTelemetry: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  TelemetryTestUtils: "resource://testing-common/TelemetryTestUtils.sys.mjs",
+  sinon: "resource://testing-common/Sinon.sys.mjs",
+});
+
+const TESTS = [
+  {
+    title: "Google search access point",
+    trackingUrl:
+      "https://www.google.com/search?q=test&ie=utf-8&oe=utf-8&client=firefox-b-1-ab",
+    expectedSearchCountEntry: "google:tagged:firefox-b-1-ab",
+    expectedAdKey: "google:tagged",
+    adUrls: [
+      "https://www.googleadservices.com/aclk=foobar",
+      "https://www.googleadservices.com/pagead/aclk=foobar",
+      "https://www.google.com/aclk=foobar",
+      "https://www.google.com/pagead/aclk=foobar",
+    ],
+    nonAdUrls: [
+      "https://www.googleadservices.com/?aclk=foobar",
+      "https://www.googleadservices.com/bar",
+      "https://www.google.com/image",
+    ],
+  },
+  {
+    title: "Google search access point follow-on",
+    trackingUrl:
+      "https://www.google.com/search?client=firefox-b-1-ab&ei=EI_VALUE&q=test2&oq=test2&gs_l=GS_L_VALUE",
+    expectedSearchCountEntry: "google:tagged-follow-on:firefox-b-1-ab",
+  },
+  {
+    title: "Google organic",
+    trackingUrl:
+      "https://www.google.com/search?client=firefox-b-d-invalid&source=hp&ei=EI_VALUE&q=test&oq=test&gs_l=GS_L_VALUE",
+    expectedSearchCountEntry: "google:organic:other",
+    expectedAdKey: "google:organic",
+    adUrls: ["https://www.googleadservices.com/aclk=foobar"],
+    nonAdUrls: ["https://www.googleadservices.com/?aclk=foobar"],
+  },
+  {
+    title: "Google organic no code",
+    trackingUrl:
+      "https://www.google.com/search?source=hp&ei=EI_VALUE&q=test&oq=test&gs_l=GS_L_VALUE",
+    expectedSearchCountEntry: "google:organic:none",
+    expectedAdKey: "google:organic",
+    adUrls: ["https://www.googleadservices.com/aclk=foobar"],
+    nonAdUrls: ["https://www.googleadservices.com/?aclk=foobar"],
+  },
+  {
+    title: "Google organic UK",
+    trackingUrl:
+      "https://www.google.co.uk/search?source=hp&ei=EI_VALUE&q=test&oq=test&gs_l=GS_L_VALUE",
+    expectedSearchCountEntry: "google:organic:none",
+  },
+  {
+    title: "Bing search access point",
+    trackingUrl: "https://www.bing.com/search?q=test&pc=MOZI&form=MOZLBR",
+    expectedSearchCountEntry: "bing:tagged:MOZI",
+    expectedAdKey: "bing:tagged",
+    adUrls: [
+      "https://www.bing.com/aclick?ld=foo",
+      "https://www.bing.com/aclk?ld=foo",
+    ],
+    nonAdUrls: [
+      "https://www.bing.com/fd/ls/ls.gif?IG=foo",
+      "https://www.bing.com/fd/ls/l?IG=bar",
+      "https://www.bing.com/aclook?",
+      "https://www.bing.com/fd/ls/GLinkPingPost.aspx?IG=baz&url=%2Fvideos%2Fsearch%3Fq%3Dfoo",
+      "https://www.bing.com/fd/ls/GLinkPingPost.aspx?IG=bar&url=https%3A%2F%2Fwww.bing.com%2Faclick",
+      "https://www.bing.com/fd/ls/GLinkPingPost.aspx?IG=bar&url=https%3A%2F%2Fwww.bing.com%2Faclk",
+    ],
+  },
+  {
+    setUp() {
+      Services.cookies.removeAll();
+      Services.cookies.add(
+        "www.bing.com",
+        "/",
+        "SRCHS",
+        "PC=MOZI",
+        false,
+        false,
+        false,
+        Date.now() + 1000 * 60 * 60,
+        {},
+        Ci.nsICookie.SAMESITE_NONE,
+        Ci.nsICookie.SCHEME_HTTPS
+      );
+    },
+    tearDown() {
+      Services.cookies.removeAll();
+    },
+    title: "Bing search access point follow-on",
+    trackingUrl:
+      "https://www.bing.com/search?q=test&qs=n&form=QBRE&sp=-1&pq=&sc=0-0&sk=&cvid=CVID_VALUE",
+    expectedSearchCountEntry: "bing:tagged-follow-on:MOZI",
+  },
+  {
+    title: "Bing organic",
+    trackingUrl: "https://www.bing.com/search?q=test&pc=MOZIfoo&form=MOZLBR",
+    expectedSearchCountEntry: "bing:organic:other",
+    expectedAdKey: "bing:organic",
+    adUrls: ["https://www.bing.com/aclick?ld=foo"],
+    nonAdUrls: ["https://www.bing.com/fd/ls/ls.gif?IG=foo"],
+  },
+  {
+    title: "Bing organic no code",
+    trackingUrl:
+      "https://www.bing.com/search?q=test&qs=n&form=QBLH&sp=-1&pq=&sc=0-0&sk=&cvid=CVID_VALUE",
+    expectedSearchCountEntry: "bing:organic:none",
+    expectedAdKey: "bing:organic",
+    adUrls: ["https://www.bing.com/aclick?ld=foo"],
+    nonAdUrls: ["https://www.bing.com/fd/ls/ls.gif?IG=foo"],
+  },
+  {
+    title: "DuckDuckGo search access point",
+    trackingUrl: "https://duckduckgo.com/?q=test&t=ffab",
+    expectedSearchCountEntry: "duckduckgo:tagged:ffab",
+    expectedAdKey: "duckduckgo:tagged",
+    adUrls: [
+      "https://duckduckgo.com/y.js?ad_provider=foo",
+      "https://duckduckgo.com/y.js?f=bar&ad_provider=foo",
+      "https://www.amazon.co.uk/foo?tag=duckduckgo-ffab-uk-32-xk",
+    ],
+    nonAdUrls: [
+      "https://duckduckgo.com/?q=foo&t=ffab&ia=images&iax=images",
+      "https://duckduckgo.com/y.js?ifu=foo",
+      "https://improving.duckduckgo.com/t/bar",
+    ],
+  },
+  {
+    title: "DuckDuckGo organic",
+    trackingUrl: "https://duckduckgo.com/?q=test&t=other&ia=news",
+    expectedSearchCountEntry: "duckduckgo:organic:other",
+    expectedAdKey: "duckduckgo:organic",
+    adUrls: ["https://duckduckgo.com/y.js?ad_provider=foo"],
+    nonAdUrls: ["https://duckduckgo.com/?q=foo&t=ffab&ia=images&iax=images"],
+  },
+  {
+    title: "DuckDuckGo expected organic code",
+    trackingUrl: "https://duckduckgo.com/?q=test&t=h_&ia=news",
+    expectedSearchCountEntry: "duckduckgo:organic:none",
+    expectedAdKey: "duckduckgo:organic",
+    adUrls: ["https://duckduckgo.com/y.js?ad_provider=foo"],
+    nonAdUrls: ["https://duckduckgo.com/?q=foo&t=ffab&ia=images&iax=images"],
+  },
+  {
+    title: "DuckDuckGo expected organic code 2",
+    trackingUrl: "https://duckduckgo.com/?q=test&t=hz&ia=news",
+    expectedSearchCountEntry: "duckduckgo:organic:none",
+    expectedAdKey: "duckduckgo:organic",
+    adUrls: ["https://duckduckgo.com/y.js?ad_provider=foo"],
+    nonAdUrls: ["https://duckduckgo.com/?q=foo&t=ffab&ia=images&iax=images"],
+  },
+  {
+    title: "DuckDuckGo organic no code",
+    trackingUrl: "https://duckduckgo.com/?q=test&ia=news",
+    expectedSearchCountEntry: "duckduckgo:organic:none",
+    expectedAdKey: "duckduckgo:organic",
+    adUrls: ["https://duckduckgo.com/y.js?ad_provider=foo"],
+    nonAdUrls: ["https://duckduckgo.com/?q=foo&t=ffab&ia=images&iax=images"],
+  },
+  {
+    title: "Baidu search access point",
+    trackingUrl: "https://www.baidu.com/baidu?wd=test&tn=monline_7_dg&ie=utf-8",
+    expectedSearchCountEntry: "baidu:tagged:monline_7_dg",
+    expectedAdKey: "baidu:tagged",
+    adUrls: ["https://www.baidu.com/baidu.php?url=encoded"],
+    nonAdUrls: ["https://www.baidu.com/link?url=encoded"],
+  },
+  {
+    title: "Baidu search access point follow-on",
+    trackingUrl:
+      "https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&tn=monline_7_dg&wd=test2&oq=test&rsv_pq=RSV_PQ_VALUE&rsv_t=RSV_T_VALUE&rqlang=cn&rsv_enter=1&rsv_sug3=2&rsv_sug2=0&inputT=227&rsv_sug4=397",
+    expectedSearchCountEntry: "baidu:tagged-follow-on:monline_7_dg",
+  },
+  {
+    title: "Baidu organic",
+    trackingUrl:
+      "https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&ch=&tn=baidu&bar=&wd=test&rn=&oq&rsv_pq=RSV_PQ_VALUE&rsv_t=RSV_T_VALUE&rqlang=cn",
+    expectedSearchCountEntry: "baidu:organic:other",
+  },
+  {
+    title: "Baidu organic no code",
+    trackingUrl:
+      "https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&ch=&bar=&wd=test&rn=&oq&rsv_pq=RSV_PQ_VALUE&rsv_t=RSV_T_VALUE&rqlang=cn",
+    expectedSearchCountEntry: "baidu:organic:none",
+  },
+  {
+    title: "Ecosia search access point",
+    trackingUrl: "https://www.ecosia.org/search?tt=mzl&q=foo",
+    expectedSearchCountEntry: "ecosia:tagged:mzl",
+    expectedAdKey: "ecosia:tagged",
+    adUrls: ["https://www.bing.com/aclick?ld=foo"],
+    nonAdUrls: [],
+  },
+  {
+    title: "Ecosia organic",
+    trackingUrl: "https://www.ecosia.org/search?method=index&q=foo",
+    expectedSearchCountEntry: "ecosia:organic:none",
+    expectedAdKey: "ecosia:organic",
+    adUrls: ["https://www.bing.com/aclick?ld=foo"],
+    nonAdUrls: [],
+  },
+];
+
+/**
+ * This function is primarily for testing the Ad URL regexps that are triggered
+ * when a URL is clicked on. These regexps are also used for the `with_ads`
+ * probe. However, we test the ad_clicks route as that is easier to hit.
+ *
+ * @param {string} serpUrl
+ *   The url to simulate where the page the click came from.
+ * @param {string} adUrl
+ *   The ad url to simulate being clicked.
+ * @param {string} [expectedAdKey]
+ *   The expected key to be logged for the scalar. Omit if no scalar should be
+ *   logged.
+ */
+async function testAdUrlClicked(serpUrl, adUrl, expectedAdKey) {
+  info(`Testing Ad URL: ${adUrl}`);
+  let channel = NetUtil.newChannel({
+    uri: NetUtil.newURI(adUrl),
+    triggeringPrincipal: Services.scriptSecurityManager.createContentPrincipal(
+      NetUtil.newURI(serpUrl),
+      {}
+    ),
+    loadUsingSystemPrincipal: true,
+  });
+  SearchSERPTelemetry._contentHandler.observeActivity(
+    channel,
+    Ci.nsIHttpActivityObserver.ACTIVITY_TYPE_HTTP_TRANSACTION,
+    Ci.nsIHttpActivityObserver.ACTIVITY_SUBTYPE_TRANSACTION_CLOSE
+  );
+  // Since the content handler takes a moment to allow the channel information
+  // to settle down, wait the same amount of time here.
+  await new Promise(resolve => Services.tm.dispatchToMainThread(resolve));
+
+  const scalars = TelemetryTestUtils.getProcessScalars("parent", true, true);
+  if (!expectedAdKey) {
+    Assert.ok(
+      !("browser.search.adclicks.unknown" in scalars),
+      "Should not have recorded an ad click"
+    );
+  } else {
+    TelemetryTestUtils.assertKeyedScalar(
+      scalars,
+      "browser.search.adclicks.unknown",
+      expectedAdKey,
+      1
+    );
+  }
+}
+
+do_get_profile();
+
+add_task(async function setup() {
+  await SearchSERPTelemetry.init();
+  sinon.stub(BrowserSearchTelemetry, "shouldRecordSearchCount").returns(true);
+  // There is no concept of browsing in unit tests, so assume in tests that we
+  // are not in private browsing mode. We have browser tests that check when
+  // private browsing is used.
+  sinon.stub(PrivateBrowsingUtils, "isBrowserPrivate").returns(false);
+});
+
+add_task(async function test_parsing_search_urls() {
+  for (const test of TESTS) {
+    info(`Running ${test.title}`);
+    if (test.setUp) {
+      test.setUp();
+    }
+    SearchSERPTelemetry.updateTrackingStatus(
+      {
+        getTabBrowser: () => {},
+      },
+      test.trackingUrl
+    );
+    let scalars = TelemetryTestUtils.getProcessScalars("parent", true, true);
+    TelemetryTestUtils.assertKeyedScalar(
+      scalars,
+      "browser.search.content.unknown",
+      test.expectedSearchCountEntry,
+      1
+    );
+
+    if ("adUrls" in test) {
+      for (const adUrl of test.adUrls) {
+        await testAdUrlClicked(test.trackingUrl, adUrl, test.expectedAdKey);
+      }
+      for (const nonAdUrls of test.nonAdUrls) {
+        await testAdUrlClicked(test.trackingUrl, nonAdUrls);
+      }
+    }
+
+    if (test.tearDown) {
+      test.tearDown();
+    }
+  }
+});
diff --git a/browser/components/search/test/unit/test_urlTelemetry_generic.js b/browser/components/search/test/unit/test_urlTelemetry_generic.js
new file mode 100644
index 0000000000..e967002421
--- /dev/null
+++ b/browser/components/search/test/unit/test_urlTelemetry_generic.js
@@ -0,0 +1,329 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  BrowserSearchTelemetry: "resource:///modules/BrowserSearchTelemetry.sys.mjs",
+  NetUtil: "resource://gre/modules/NetUtil.sys.mjs",
+  PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
+  SearchSERPTelemetry: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchSERPTelemetryUtils: "resource:///modules/SearchSERPTelemetry.sys.mjs",
+  SearchUtils: "resource://gre/modules/SearchUtils.sys.mjs",
+  TelemetryTestUtils: "resource://testing-common/TelemetryTestUtils.sys.mjs",
+  sinon: "resource://testing-common/Sinon.sys.mjs",
+});
+
+const TEST_PROVIDER_INFO = [
+  {
+    telemetryId: "example",
+    searchPageRegexp: /^https:\/\/www\.example\.com\/search/,
+    queryParamNames: ["q"],
+    codeParamName: "abc",
+    taggedCodes: ["ff", "tb"],
+    expectedOrganicCodes: ["baz"],
+    organicCodes: ["foo"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/www\.example\.com\/ad2/],
+    shoppingTab: {
+      regexp: "&site=shop",
+    },
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+  {
+    telemetryId: "example2",
+    searchPageRegexp: /^https:\/\/www\.example2\.com\/search/,
+    queryParamNames: ["a", "q"],
+    codeParamName: "abc",
+    taggedCodes: ["ff", "tb"],
+    expectedOrganicCodes: ["baz"],
+    organicCodes: ["foo"],
+    followOnParamNames: ["a"],
+    extraAdServersRegexps: [/^https:\/\/www\.example\.com\/ad2/],
+    components: [
+      {
+        type: SearchSERPTelemetryUtils.COMPONENTS.AD_LINK,
+        default: true,
+      },
+    ],
+  },
+];
+
+const TESTS = [
+  {
+    title: "Tagged search",
+    trackingUrl: "https://www.example.com/search?q=test&abc=ff",
+    expectedSearchCountEntry: "example:tagged:ff",
+    expectedAdKey: "example:tagged",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example",
+      tagged: "true",
+      partner_code: "ff",
+      is_shopping_page: "false",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+  {
+    title: "Tagged search with shopping",
+    trackingUrl: "https://www.example.com/search?q=test&abc=ff&site=shop",
+    expectedSearchCountEntry: "example:tagged:ff",
+    expectedAdKey: "example:tagged",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example",
+      tagged: "true",
+      partner_code: "ff",
+      is_shopping_page: "true",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+  {
+    title: "Tagged follow-on",
+    trackingUrl: "https://www.example.com/search?q=test&abc=tb&a=next",
+    expectedSearchCountEntry: "example:tagged-follow-on:tb",
+    expectedAdKey: "example:tagged-follow-on",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example",
+      tagged: "true",
+      partner_code: "tb",
+      is_shopping_page: "false",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+  {
+    title: "Organic search matched code",
+    trackingUrl: "https://www.example.com/search?q=test&abc=foo",
+    expectedSearchCountEntry: "example:organic:foo",
+    expectedAdKey: "example:organic",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example",
+      tagged: "false",
+      partner_code: "foo",
+      is_shopping_page: "false",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+  {
+    title: "Organic search non-matched code",
+    trackingUrl: "https://www.example.com/search?q=test&abc=ff123",
+    expectedSearchCountEntry: "example:organic:other",
+    expectedAdKey: "example:organic",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example",
+      tagged: "false",
+      partner_code: "other",
+      is_shopping_page: "false",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+  {
+    title: "Organic search non-matched code 2",
+    trackingUrl: "https://www.example.com/search?q=test&abc=foo123",
+    expectedSearchCountEntry: "example:organic:other",
+    expectedAdKey: "example:organic",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example",
+      tagged: "false",
+      partner_code: "other",
+      is_shopping_page: "false",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+  {
+    title: "Organic search expected organic matched code",
+    trackingUrl: "https://www.example.com/search?q=test&abc=baz",
+    expectedSearchCountEntry: "example:organic:none",
+    expectedAdKey: "example:organic",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example",
+      tagged: "false",
+      partner_code: "",
+      is_shopping_page: "false",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+  {
+    title: "Organic search no codes",
+    trackingUrl: "https://www.example.com/search?q=test",
+    expectedSearchCountEntry: "example:organic:none",
+    expectedAdKey: "example:organic",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example",
+      tagged: "false",
+      partner_code: "",
+      is_shopping_page: "false",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+  {
+    title: "Different engines using the same adUrl",
+    trackingUrl: "https://www.example2.com/search?q=test",
+    expectedSearchCountEntry: "example2:organic:none",
+    expectedAdKey: "example2:organic",
+    adUrls: ["https://www.example.com/ad2"],
+    nonAdUrls: ["https://www.example.com/ad3"],
+    impression: {
+      provider: "example2",
+      tagged: "false",
+      partner_code: "",
+      is_shopping_page: "false",
+      is_private: "false",
+      shopping_tab_displayed: "false",
+      source: "unknown",
+    },
+  },
+];
+
+/**
+ * This function is primarily for testing the Ad URL regexps that are triggered
+ * when a URL is clicked on. These regexps are also used for the `withads`
+ * probe. However, we test the adclicks route as that is easier to hit.
+ *
+ * @param {string} serpUrl
+ *   The url to simulate where the page the click came from.
+ * @param {string} adUrl
+ *   The ad url to simulate being clicked.
+ * @param {string} [expectedAdKey]
+ *   The expected key to be logged for the scalar. Omit if no scalar should be
+ *   logged.
+ */
+async function testAdUrlClicked(serpUrl, adUrl, expectedAdKey) {
+  info(`Testing Ad URL: ${adUrl}`);
+  let channel = NetUtil.newChannel({
+    uri: NetUtil.newURI(adUrl),
+    triggeringPrincipal: Services.scriptSecurityManager.createContentPrincipal(
+      NetUtil.newURI(serpUrl),
+      {}
+    ),
+    loadUsingSystemPrincipal: true,
+  });
+  SearchSERPTelemetry._contentHandler.observeActivity(
+    channel,
+    Ci.nsIHttpActivityObserver.ACTIVITY_TYPE_HTTP_TRANSACTION,
+    Ci.nsIHttpActivityObserver.ACTIVITY_SUBTYPE_TRANSACTION_CLOSE
+  );
+  // Since the content handler takes a moment to allow the channel information
+  // to settle down, wait the same amount of time here.
+  await new Promise(resolve => Services.tm.dispatchToMainThread(resolve));
+
+  const scalars = TelemetryTestUtils.getProcessScalars("parent", true, true);
+  if (!expectedAdKey) {
+    Assert.ok(
+      !("browser.search.adclicks.unknown" in scalars),
+      "Should not have recorded an ad click"
+    );
+  } else {
+    TelemetryTestUtils.assertKeyedScalar(
+      scalars,
+      "browser.search.adclicks.unknown",
+      expectedAdKey,
+      1
+    );
+  }
+}
+
+do_get_profile();
+
+add_task(async function setup() {
+  Services.prefs.setBoolPref(
+    SearchUtils.BROWSER_SEARCH_PREF + "serpEventTelemetry.enabled",
+    true
+  );
+  Services.fog.initializeFOG();
+  await SearchSERPTelemetry.init();
+  SearchSERPTelemetry.overrideSearchTelemetryForTests(TEST_PROVIDER_INFO);
+  sinon.stub(BrowserSearchTelemetry, "shouldRecordSearchCount").returns(true);
+  // There is no concept of browsing in unit tests, so assume in tests that we
+  // are not in private browsing mode. We have browser tests that check when
+  // private browsing is used.
+  sinon.stub(PrivateBrowsingUtils, "isBrowserPrivate").returns(false);
+});
+
+add_task(async function test_parsing_search_urls() {
+  for (const test of TESTS) {
+    info(`Running ${test.title}`);
+    if (test.setUp) {
+      test.setUp();
+    }
+    let browser = {
+      getTabBrowser: () => {},
+    };
+    SearchSERPTelemetry.updateTrackingStatus(browser, test.trackingUrl);
+    SearchSERPTelemetry.reportPageImpression(
+      {
+        url: test.trackingUrl,
+        shoppingTabDisplayed: false,
+      },
+      browser
+    );
+    let scalars = TelemetryTestUtils.getProcessScalars("parent", true, true);
+    TelemetryTestUtils.assertKeyedScalar(
+      scalars,
+      "browser.search.content.unknown",
+      test.expectedSearchCountEntry,
+      1
+    );
+
+    if ("adUrls" in test) {
+      for (const adUrl of test.adUrls) {
+        await testAdUrlClicked(test.trackingUrl, adUrl, test.expectedAdKey);
+      }
+      for (const nonAdUrls of test.nonAdUrls) {
+        await testAdUrlClicked(test.trackingUrl, nonAdUrls);
+      }
+    }
+
+    let recordedEvents = Glean.serp.impression.testGetValue();
+
+    Assert.equal(
+      recordedEvents.length,
+      1,
+      "should only see one impression event"
+    );
+
+    // To allow deep equality.
+    test.impression.impression_id = recordedEvents[0].extra.impression_id;
+    Assert.deepEqual(recordedEvents[0].extra, test.impression);
+
+    if (test.tearDown) {
+      test.tearDown();
+    }
+
+    // We need to clear Glean events so they don't accumulate for each iteration.
+    Services.fog.testResetFOG();
+  }
+});
diff --git a/browser/components/search/test/unit/xpcshell.toml b/browser/components/search/test/unit/xpcshell.toml
new file mode 100644
index 0000000000..61cdb83378
--- /dev/null
+++ b/browser/components/search/test/unit/xpcshell.toml
@@ -0,0 +1,29 @@
+[DEFAULT]
+support-files = [
+  "../../../../../services/settings/dumps/main/search-config-v2.json",
+]
+prefs = ["browser.search.log=true"]
+skip-if = ["os == 'android'"] # bug 1730213
+firefox-appdir = "browser"
+
+["test_search_telemetry_categorization_logic.js"]
+
+["test_search_telemetry_categorization_process_domains.js"]
+
+["test_search_telemetry_categorization_sync.js"]
+prefs = ["browser.search.serpEventTelemetryCategorization.enabled=true"]
+support-files = [
+  "domain_category_mappings_1a.json",
+  "domain_category_mappings_1b.json",
+  "domain_category_mappings_2a.json",
+  "domain_category_mappings_2b.json",
+]
+
+["test_search_telemetry_compare_urls.js"]
+
+["test_search_telemetry_config_validation.js"]
+support-files = ["../../schema/search-telemetry-schema.json"]
+
+["test_urlTelemetry.js"]
+
+["test_urlTelemetry_generic.js"]