Adding upstream version 115.7.0esr.upstream/115.7.0esr

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

5 files changed, 2517 insertions, 0 deletions

diff --git a/browser/components/search/content/autocomplete-popup.js b/browser/components/search/content/autocomplete-popup.js
new file mode 100644
index 0000000000..7732f2bbb2
--- /dev/null
+++ b/browser/components/search/content/autocomplete-popup.js
@@ -0,0 +1,289 @@
+/* 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/. */
+
+"use strict";
+
+// Wrap in a block to prevent leaking to window scope.
+{
+  ChromeUtils.defineESModuleGetters(this, {
+    SearchOneOffs: "resource:///modules/SearchOneOffs.sys.mjs",
+  });
+
+  /**
+   * A richlistbox popup custom element for for a browser search autocomplete
+   * widget.
+   */
+  class MozSearchAutocompleteRichlistboxPopup extends MozElements.MozAutocompleteRichlistboxPopup {
+    constructor() {
+      super();
+
+      this.addEventListener("popupshowing", event => {
+        // First handle deciding if we are showing the reduced version of the
+        // popup containing only the preferences button. We do this if the
+        // glass icon has been clicked if the text field is empty.
+        if (this.searchbar.hasAttribute("showonlysettings")) {
+          this.searchbar.removeAttribute("showonlysettings");
+          this.setAttribute("showonlysettings", "true");
+
+          // Setting this with an xbl-inherited attribute gets overridden the
+          // second time the user clicks the glass icon for some reason...
+          this.richlistbox.collapsed = true;
+        } else {
+          this.removeAttribute("showonlysettings");
+          // Uncollapse as long as we have a view which has >= 1 row.
+          // The autocomplete binding itself will take care of uncollapsing later,
+          // if we currently have no rows but end up having some in the future
+          // when the search string changes
+          this.richlistbox.collapsed = this.matchCount == 0;
+        }
+
+        // Show the current default engine in the top header of the panel.
+        this.updateHeader().catch(console.error);
+
+        this._oneOffButtons.addEventListener(
+          "SelectedOneOffButtonChanged",
+          this
+        );
+      });
+
+      this.addEventListener("popuphiding", event => {
+        this._oneOffButtons.removeEventListener(
+          "SelectedOneOffButtonChanged",
+          this
+        );
+      });
+
+      /**
+       * This handles clicks on the topmost "Foo Search" header in the
+       * popup (hbox.search-panel-header]).
+       */
+      this.addEventListener("click", event => {
+        if (event.button == 2) {
+          // Ignore right clicks.
+          return;
+        }
+        let button = event.originalTarget;
+        let engine = button.parentNode.engine;
+        if (!engine) {
+          return;
+        }
+        this.oneOffButtons.handleSearchCommand(event, engine);
+      });
+
+      this._bundle = null;
+    }
+
+    static get inheritedAttributes() {
+      return {
+        ".search-panel-current-engine": "showonlysettings",
+        ".searchbar-engine-image": "src",
+      };
+    }
+
+    // We override this because even though we have a shadow root, we want our
+    // inheritance to be done on the light tree.
+    getElementForAttrInheritance(selector) {
+      return this.querySelector(selector);
+    }
+
+    initialize() {
+      super.initialize();
+      this.initializeAttributeInheritance();
+
+      this._searchOneOffsContainer = this.querySelector(".search-one-offs");
+      this._searchbarEngine = this.querySelector(".search-panel-header");
+      this._searchbarEngineName = this.querySelector(".searchbar-engine-name");
+      this._oneOffButtons = new SearchOneOffs(this._searchOneOffsContainer);
+      this._searchbar = document.getElementById("searchbar");
+    }
+
+    get oneOffButtons() {
+      if (!this._oneOffButtons) {
+        this.initialize();
+      }
+      return this._oneOffButtons;
+    }
+
+    static get markup() {
+      return `
+      <hbox class="search-panel-header search-panel-current-engine">
+        <image class="searchbar-engine-image"/>
+        <label class="searchbar-engine-name" flex="1" crop="end" role="presentation"/>
+      </hbox>
+      <menuseparator class="searchbar-separator"/>
+      <richlistbox class="autocomplete-richlistbox search-panel-tree"/>
+      <menuseparator class="searchbar-separator"/>
+      <hbox class="search-one-offs" is_searchbar="true"/>
+    `;
+    }
+
+    get searchOneOffsContainer() {
+      if (!this._searchOneOffsContainer) {
+        this.initialize();
+      }
+      return this._searchOneOffsContainer;
+    }
+
+    get searchbarEngine() {
+      if (!this._searchbarEngine) {
+        this.initialize();
+      }
+      return this._searchbarEngine;
+    }
+
+    get searchbarEngineName() {
+      if (!this._searchbarEngineName) {
+        this.initialize();
+      }
+      return this._searchbarEngineName;
+    }
+
+    get searchbar() {
+      if (!this._searchbar) {
+        this.initialize();
+      }
+      return this._searchbar;
+    }
+
+    get bundle() {
+      if (!this._bundle) {
+        const kBundleURI = "chrome://browser/locale/search.properties";
+        this._bundle = Services.strings.createBundle(kBundleURI);
+      }
+      return this._bundle;
+    }
+
+    openAutocompletePopup(aInput, aElement) {
+      // initially the panel is hidden
+      // to avoid impacting startup / new window performance
+      aInput.popup.hidden = false;
+
+      // this method is defined on the base binding
+      this._openAutocompletePopup(aInput, aElement);
+    }
+
+    onPopupClick(aEvent) {
+      // Ignore all right-clicks
+      if (aEvent.button == 2) {
+        return;
+      }
+
+      this.searchbar.telemetrySelectedIndex = this.selectedIndex;
+
+      // Check for unmodified left-click, and use default behavior
+      if (
+        aEvent.button == 0 &&
+        !aEvent.shiftKey &&
+        !aEvent.ctrlKey &&
+        !aEvent.altKey &&
+        !aEvent.metaKey
+      ) {
+        this.input.controller.handleEnter(true, aEvent);
+        return;
+      }
+
+      // Check for middle-click or modified clicks on the search bar
+      BrowserSearchTelemetry.recordSearchSuggestionSelectionMethod(
+        aEvent,
+        "searchbar",
+        this.selectedIndex
+      );
+
+      // Handle search bar popup clicks
+      let search = this.input.controller.getValueAt(this.selectedIndex);
+
+      // open the search results according to the clicking subtlety
+      let where = whereToOpenLink(aEvent, false, true);
+      let params = {};
+
+      // But open ctrl/cmd clicks on autocomplete items in a new background tab.
+      let modifier =
+        AppConstants.platform == "macosx" ? aEvent.metaKey : aEvent.ctrlKey;
+      if (
+        where == "tab" &&
+        MouseEvent.isInstance(aEvent) &&
+        (aEvent.button == 1 || modifier)
+      ) {
+        params.inBackground = true;
+      }
+
+      // leave the popup open for background tab loads
+      if (!(where == "tab" && params.inBackground)) {
+        // close the autocomplete popup and revert the entered search term
+        this.closePopup();
+        this.input.controller.handleEscape();
+      }
+
+      this.searchbar.doSearch(search, where, null, params);
+      if (where == "tab" && params.inBackground) {
+        this.searchbar.focus();
+      } else {
+        this.searchbar.value = search;
+      }
+    }
+
+    async updateHeader(engine) {
+      if (!engine) {
+        if (PrivateBrowsingUtils.isWindowPrivate(window)) {
+          engine = await Services.search.getDefaultPrivate();
+        } else {
+          engine = await Services.search.getDefault();
+        }
+      }
+
+      let uri = engine.iconURI;
+      if (uri) {
+        this.setAttribute("src", uri.spec);
+      } else {
+        // If the default has just been changed to a provider without icon,
+        // avoid showing the icon of the previous default provider.
+        this.removeAttribute("src");
+      }
+
+      let headerText = this.bundle.formatStringFromName("searchHeader", [
+        engine.name,
+      ]);
+      this.searchbarEngineName.setAttribute("value", headerText);
+      this.searchbarEngine.engine = engine;
+    }
+
+    /**
+     * This is called when a one-off is clicked and when "search in new tab"
+     * is selected from a one-off context menu.
+     */
+    /* eslint-disable-next-line valid-jsdoc */
+    handleOneOffSearch(event, engine, where, params) {
+      this.searchbar.handleSearchCommandWhere(event, engine, where, params);
+    }
+
+    /**
+     * Passes DOM events for the popup to the _on_<event type> methods.
+     *
+     * @param {Event} event
+     *   DOM event from the <popup>.
+     */
+    handleEvent(event) {
+      let methodName = "_on_" + event.type;
+      if (methodName in this) {
+        this[methodName](event);
+      } else {
+        throw new Error("Unrecognized UrlbarView event: " + event.type);
+      }
+    }
+    _on_SelectedOneOffButtonChanged() {
+      let engine =
+        this.oneOffButtons.selectedButton &&
+        this.oneOffButtons.selectedButton.engine;
+      this.updateHeader(engine).catch(console.error);
+    }
+  }
+
+  customElements.define(
+    "search-autocomplete-richlistbox-popup",
+    MozSearchAutocompleteRichlistboxPopup,
+    {
+      extends: "panel",
+    }
+  );
+}
diff --git a/browser/components/search/content/contentSearchHandoffUI.js b/browser/components/search/content/contentSearchHandoffUI.js
new file mode 100644
index 0000000000..7c2aaa71b7
--- /dev/null
+++ b/browser/components/search/content/contentSearchHandoffUI.js
@@ -0,0 +1,152 @@
+/* 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/. */
+
+"use strict";
+
+function ContentSearchHandoffUIController() {
+  this._isPrivateEngine = false;
+  this._isAboutPrivateBrowsing = false;
+  this._engineIcon = null;
+
+  window.addEventListener("ContentSearchService", this);
+  this._sendMsg("GetEngine");
+  this._sendMsg("GetHandoffSearchModePrefs");
+}
+
+ContentSearchHandoffUIController.prototype = {
+  handleEvent(event) {
+    let methodName = "_onMsg" + event.detail.type;
+    if (methodName in this) {
+      this[methodName](event.detail.data);
+    }
+  },
+
+  get defaultEngine() {
+    return this._defaultEngine;
+  },
+
+  _onMsgEngine({ isPrivateEngine, isAboutPrivateBrowsing, engine }) {
+    this._isPrivateEngine = isPrivateEngine;
+    this._isAboutPrivateBrowsing = isAboutPrivateBrowsing;
+    this._updateEngine(engine);
+  },
+
+  _onMsgCurrentEngine(engine) {
+    if (!this._isPrivateEngine) {
+      this._updateEngine(engine);
+    }
+  },
+
+  _onMsgCurrentPrivateEngine(engine) {
+    if (this._isPrivateEngine) {
+      this._updateEngine(engine);
+    }
+  },
+
+  _onMsgHandoffSearchModePrefs(pref) {
+    this._shouldHandOffToSearchMode = pref;
+    this._updatel10nIds();
+  },
+
+  _updateEngine(engine) {
+    this._defaultEngine = engine;
+    if (this._engineIcon) {
+      URL.revokeObjectURL(this._engineIcon);
+    }
+
+    // We only show the engines icon for app provided engines, otherwise show
+    // a default. xref https://bugzilla.mozilla.org/show_bug.cgi?id=1449338#c19
+    if (!engine.isAppProvided) {
+      this._engineIcon = "chrome://global/skin/icons/search-glass.svg";
+    } else if (engine.iconData) {
+      this._engineIcon = this._getFaviconURIFromIconData(engine.iconData);
+    } else {
+      this._engineIcon = "chrome://global/skin/icons/defaultFavicon.svg";
+    }
+
+    document.body.style.setProperty(
+      "--newtab-search-icon",
+      "url(" + this._engineIcon + ")"
+    );
+    this._updatel10nIds();
+  },
+
+  _updatel10nIds() {
+    let engine = this._defaultEngine;
+    let fakeButton = document.querySelector(".search-handoff-button");
+    let fakeInput = document.querySelector(".fake-textbox");
+    if (!fakeButton || !fakeInput) {
+      return;
+    }
+    if (!engine || this._shouldHandOffToSearchMode) {
+      document.l10n.setAttributes(
+        fakeButton,
+        this._isAboutPrivateBrowsing
+          ? "about-private-browsing-search-btn"
+          : "newtab-search-box-input"
+      );
+      document.l10n.setAttributes(
+        fakeInput,
+        this._isAboutPrivateBrowsing
+          ? "about-private-browsing-search-placeholder"
+          : "newtab-search-box-text"
+      );
+    } else if (!engine.isAppProvided) {
+      document.l10n.setAttributes(
+        fakeButton,
+        this._isAboutPrivateBrowsing
+          ? "about-private-browsing-handoff-no-engine"
+          : "newtab-search-box-handoff-input-no-engine"
+      );
+      document.l10n.setAttributes(
+        fakeInput,
+        this._isAboutPrivateBrowsing
+          ? "about-private-browsing-handoff-text-no-engine"
+          : "newtab-search-box-handoff-text-no-engine"
+      );
+    } else {
+      document.l10n.setAttributes(
+        fakeButton,
+        this._isAboutPrivateBrowsing
+          ? "about-private-browsing-handoff"
+          : "newtab-search-box-handoff-input",
+        {
+          engine: engine.name,
+        }
+      );
+      document.l10n.setAttributes(
+        fakeInput,
+        this._isAboutPrivateBrowsing
+          ? "about-private-browsing-handoff-text"
+          : "newtab-search-box-handoff-text",
+        {
+          engine: engine.name,
+        }
+      );
+    }
+  },
+
+  // If the favicon is an array buffer, convert it into a Blob URI.
+  // Otherwise just return the plain URI.
+  _getFaviconURIFromIconData(data) {
+    if (typeof data === "string") {
+      return data;
+    }
+
+    // If typeof(data) != "string", we assume it's an ArrayBuffer
+    let blob = new Blob([data]);
+    return URL.createObjectURL(blob);
+  },
+
+  _sendMsg(type, data = null) {
+    dispatchEvent(
+      new CustomEvent("ContentSearchClient", {
+        detail: {
+          type,
+          data,
+        },
+      })
+    );
+  },
+};
diff --git a/browser/components/search/content/contentSearchUI.css b/browser/components/search/content/contentSearchUI.css
new file mode 100644
index 0000000000..85b718a3eb
--- /dev/null
+++ b/browser/components/search/content/contentSearchUI.css
@@ -0,0 +1,160 @@
+/* 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/. */
+
+.contentSearchSuggestionTable {
+  background-color: hsla(0,0%,100%,.99);
+  color: black;
+  border: 1px solid hsla(0, 0%, 0%, .2);
+  border-top: none;
+  box-shadow: 0 5px 10px hsla(0, 0%, 0%, .1);
+  position: absolute;
+  inset-inline-start: 0;
+  z-index: 1001;
+  user-select: none;
+  cursor: default;
+}
+
+.contentSearchSuggestionsList {
+  border-bottom: 1px solid hsl(0, 0%, 92%);
+  width: 100%;
+  height: 100%;
+}
+
+.contentSearchSuggestionTable,
+.contentSearchSuggestionsList {
+  border-spacing: 0;
+  overflow: hidden;
+  padding: 0;
+  margin: 0;
+  text-align: start;
+}
+
+.contentSearchHeaderRow,
+.contentSearchSuggestionRow {
+  margin: 0;
+  max-width: inherit;
+  padding: 0;
+}
+
+.contentSearchHeaderRow > td > img,
+.contentSearchSuggestionRow > td > .historyIcon {
+  margin-inline-end: 8px;
+  margin-bottom: -3px;
+}
+
+.contentSearchSuggestionTable .historyIcon {
+  width: 16px;
+  height: 16px;
+  display: inline-block;
+  background-image: url("chrome://browser/skin/history.svg");
+  -moz-context-properties: fill;
+  fill: graytext;
+}
+
+.contentSearchSuggestionRow.selected > td > .historyIcon {
+  fill: HighlightText;
+}
+
+.contentSearchHeader > img {
+  height: 16px;
+  width: 16px;
+  margin: 0;
+  padding: 0;
+}
+
+.contentSearchSuggestionRow.remote > td > .historyIcon {
+  visibility: hidden;
+}
+
+.contentSearchSuggestionRow.selected {
+  background-color: SelectedItem;
+  color: SelectedItemText;
+}
+
+.contentSearchHeader,
+.contentSearchSuggestionEntry {
+  margin: 0;
+  max-width: inherit;
+  overflow: hidden;
+  padding: 4px 10px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  font-size: 75%;
+}
+
+.contentSearchHeader {
+  background-color: hsl(0, 0%, 97%);
+  color: #666;
+  border-bottom: 1px solid hsl(0, 0%, 92%);
+}
+
+.contentSearchSuggestionsContainer {
+  margin: 0;
+  padding: 0;
+  border-spacing: 0;
+  width: 100%;
+}
+
+.contentSearchSearchWithHeaderSearchText {
+  white-space: pre;
+  font-weight: bold;
+}
+
+.contentSearchOneOffItem {
+  appearance: none;
+  height: 32px;
+  margin: 0;
+  padding: 0;
+  border: none;
+  background: none;
+  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAWCAYAAAABxvaqAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3gofECQNNVW2/AAAABBJREFUGFdjOHPmzH8GehEA/KpKg9YTf4AAAAAASUVORK5CYII=');
+  background-repeat: no-repeat;
+  background-position: right center;
+}
+
+.contentSearchOneOffItem:dir(rtl) {
+  background-position-x: left;
+}
+
+.contentSearchOneOffItem > img {
+  width: 16px;
+  height: 16px;
+  margin-bottom: -2px;
+  pointer-events: none;
+}
+
+.contentSearchOneOffItem:not(.last-row) {
+  border-bottom: 1px solid hsl(0, 0%, 92%);
+}
+
+.contentSearchOneOffItem.end-of-row {
+  background-image: none;
+}
+
+.contentSearchOneOffItem.selected {
+  background-color: SelectedItem;
+  background-image: none;
+}
+
+.contentSearchOneOffsTable {
+  width: 100%;
+}
+
+.contentSearchSettingsButton {
+  margin: 0;
+  padding: 0;
+  height: 32px;
+  border: none;
+  border-top: 1px solid hsla(0, 0%, 0%, .08);
+  text-align: center;
+  width: 100%;
+}
+
+.contentSearchSettingsButton.selected {
+  background-color: hsl(0, 0%, 90%);
+}
+
+.contentSearchSettingsButton:active {
+  background-color: hsl(0, 0%, 85%);
+}
diff --git a/browser/components/search/content/contentSearchUI.js b/browser/components/search/content/contentSearchUI.js
new file mode 100644
index 0000000000..9c7387d364
--- /dev/null
+++ b/browser/components/search/content/contentSearchUI.js
@@ -0,0 +1,1021 @@
+/* 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/. */
+
+"use strict";
+
+this.ContentSearchUIController = (function () {
+  const MAX_DISPLAYED_SUGGESTIONS = 6;
+  const SUGGESTION_ID_PREFIX = "searchSuggestion";
+  const ONE_OFF_ID_PREFIX = "oneOff";
+  const HTML_NS = "http://www.w3.org/1999/xhtml";
+
+  /**
+   * Creates a new object that manages search suggestions and their UI for a text
+   * box.
+   *
+   * The UI consists of an html:table that's inserted into the DOM after the given
+   * text box and styled so that it appears as a dropdown below the text box.
+   *
+   * @param {DOMElement} inputElement
+   *        Search suggestions will be based on the text in this text box.
+   *        Assumed to be an html:input.
+   * @param {DOMElement} tableParent
+   *        The suggestion table is appended as a child to this element.  Since
+   *        the table is absolutely positioned and its top and left values are set
+   *        to be relative to the top and left of the page, either the parent and
+   *        all its ancestors should not be positioned elements (i.e., their
+   *        positions should be "static"), or the parent's position should be the
+   *        top left of the page.
+   * @param {string} healthReportKey
+   *        This will be sent with the search data for BrowserUsageTelemetry to
+   *        record the search.
+   * @param {string} searchPurpose
+   *        Sent with search data, see nsISearchEngine.getSubmission.
+   * @param {sring} idPrefix
+   *        The IDs of elements created by the object will be prefixed with this
+   *        string.
+   */
+  function ContentSearchUIController(
+    inputElement,
+    tableParent,
+    healthReportKey,
+    searchPurpose,
+    idPrefix = ""
+  ) {
+    this.input = inputElement;
+    this._idPrefix = idPrefix;
+    this._healthReportKey = healthReportKey;
+    this._searchPurpose = searchPurpose;
+    this._isPrivateEngine = false;
+
+    let tableID = idPrefix + "searchSuggestionTable";
+    this.input.autocomplete = "off";
+    this.input.setAttribute("aria-autocomplete", "true");
+    this.input.setAttribute("aria-controls", tableID);
+    tableParent.appendChild(this._makeTable(tableID));
+
+    this.input.addEventListener("keydown", this);
+    this.input.addEventListener("input", this);
+    this.input.addEventListener("focus", this);
+    this.input.addEventListener("blur", this);
+    window.addEventListener("ContentSearchService", this);
+
+    this._stickyInputValue = "";
+    this._hideSuggestions();
+
+    this._getSearchEngines();
+    this._getStrings();
+  }
+
+  ContentSearchUIController.prototype = {
+    _oneOffButtons: [],
+    // Setting up the one off buttons causes an uninterruptible reflow. If we
+    // receive the list of engines while the newtab page is loading, this reflow
+    // may regress performance - so we set this flag and only set up the buttons
+    // if it's set when the suggestions table is actually opened.
+    _pendingOneOffRefresh: undefined,
+
+    get defaultEngine() {
+      return this._defaultEngine;
+    },
+
+    set defaultEngine(engine) {
+      if (this._defaultEngine && this._defaultEngine.icon) {
+        URL.revokeObjectURL(this._defaultEngine.icon);
+      }
+      let icon;
+      if (engine.iconData) {
+        icon = this._getFaviconURIFromIconData(engine.iconData);
+      } else {
+        icon = "chrome://global/skin/icons/defaultFavicon.svg";
+      }
+      this._defaultEngine = {
+        name: engine.name,
+        icon,
+        isAppProvided: engine.isAppProvided,
+      };
+      this._updateDefaultEngineHeader();
+      this._updateDefaultEngineIcon();
+
+      if (engine && document.activeElement == this.input) {
+        this._speculativeConnect();
+      }
+    },
+
+    get engines() {
+      return this._engines;
+    },
+
+    set engines(val) {
+      this._engines = val;
+      this._pendingOneOffRefresh = true;
+    },
+
+    // The selectedIndex is the index of the element with the "selected" class in
+    // the list obtained by concatenating the suggestion rows, one-off buttons, and
+    // search settings button.
+    get selectedIndex() {
+      let allElts = [
+        ...this._suggestionsList.children,
+        ...this._oneOffButtons,
+        document.getElementById("contentSearchSettingsButton"),
+      ];
+      for (let i = 0; i < allElts.length; ++i) {
+        let elt = allElts[i];
+        if (elt.classList.contains("selected")) {
+          return i;
+        }
+      }
+      return -1;
+    },
+
+    set selectedIndex(idx) {
+      // Update the table's rows, and the input when there is a selection.
+      this._table.removeAttribute("aria-activedescendant");
+      this.input.removeAttribute("aria-activedescendant");
+
+      let allElts = [
+        ...this._suggestionsList.children,
+        ...this._oneOffButtons,
+        document.getElementById("contentSearchSettingsButton"),
+      ];
+      // If we are selecting a suggestion and a one-off is selected, don't deselect it.
+      let excludeIndex =
+        idx < this.numSuggestions && this.selectedButtonIndex > -1
+          ? this.numSuggestions + this.selectedButtonIndex
+          : -1;
+      for (let i = 0; i < allElts.length; ++i) {
+        let elt = allElts[i];
+        let ariaSelectedElt = i < this.numSuggestions ? elt.firstChild : elt;
+        if (i == idx) {
+          elt.classList.add("selected");
+          ariaSelectedElt.setAttribute("aria-selected", "true");
+          this.input.setAttribute("aria-activedescendant", ariaSelectedElt.id);
+        } else if (i != excludeIndex) {
+          elt.classList.remove("selected");
+          ariaSelectedElt.setAttribute("aria-selected", "false");
+        }
+      }
+    },
+
+    get selectedButtonIndex() {
+      let elts = [
+        ...this._oneOffButtons,
+        document.getElementById("contentSearchSettingsButton"),
+      ];
+      for (let i = 0; i < elts.length; ++i) {
+        if (elts[i].classList.contains("selected")) {
+          return i;
+        }
+      }
+      return -1;
+    },
+
+    set selectedButtonIndex(idx) {
+      let elts = [
+        ...this._oneOffButtons,
+        document.getElementById("contentSearchSettingsButton"),
+      ];
+      for (let i = 0; i < elts.length; ++i) {
+        let elt = elts[i];
+        if (i == idx) {
+          elt.classList.add("selected");
+          elt.setAttribute("aria-selected", "true");
+        } else {
+          elt.classList.remove("selected");
+          elt.setAttribute("aria-selected", "false");
+        }
+      }
+    },
+
+    get selectedEngineName() {
+      let selectedElt = this._oneOffsTable.querySelector(".selected");
+      if (selectedElt) {
+        return selectedElt.engineName;
+      }
+      return this.defaultEngine.name;
+    },
+
+    get numSuggestions() {
+      return this._suggestionsList.children.length;
+    },
+
+    selectAndUpdateInput(idx) {
+      this.selectedIndex = idx;
+      let newValue = this.suggestionAtIndex(idx) || this._stickyInputValue;
+      // Setting the input value when the value has not changed commits the current
+      // IME composition, which we don't want to do.
+      if (this.input.value != newValue) {
+        this.input.value = newValue;
+      }
+      this._updateSearchWithHeader();
+    },
+
+    suggestionAtIndex(idx) {
+      let row = this._suggestionsList.children[idx];
+      return row ? row.textContent : null;
+    },
+
+    deleteSuggestionAtIndex(idx) {
+      // Only form history suggestions can be deleted.
+      if (this.isFormHistorySuggestionAtIndex(idx)) {
+        let suggestionStr = this.suggestionAtIndex(idx);
+        this._sendMsg("RemoveFormHistoryEntry", suggestionStr);
+        this._suggestionsList.children[idx].remove();
+        this.selectAndUpdateInput(-1);
+      }
+    },
+
+    isFormHistorySuggestionAtIndex(idx) {
+      let row = this._suggestionsList.children[idx];
+      return row && row.classList.contains("formHistory");
+    },
+
+    addInputValueToFormHistory() {
+      let entry = {
+        value: this.input.value,
+        engineName: this.selectedEngineName,
+      };
+      this._sendMsg("AddFormHistoryEntry", entry);
+      return entry;
+    },
+
+    handleEvent(event) {
+      // The event handler is triggered by external events while the search
+      // element may no longer be present
+      if (!document.contains(this.input)) {
+        return;
+      }
+      this["_on" + event.type[0].toUpperCase() + event.type.substr(1)](event);
+    },
+
+    _onCommand(aEvent) {
+      if (this.selectedButtonIndex == this._oneOffButtons.length) {
+        // Settings button was selected.
+        this._sendMsg("ManageEngines");
+        return;
+      }
+
+      this.search(aEvent);
+
+      if (aEvent) {
+        aEvent.preventDefault();
+      }
+    },
+
+    search(aEvent) {
+      if (!this.defaultEngine) {
+        return; // Not initialized yet.
+      }
+
+      let searchText = this.input;
+      let searchTerms;
+      if (
+        this._table.hidden ||
+        (aEvent.originalTarget &&
+          aEvent.originalTarget.id == "contentSearchDefaultEngineHeader") ||
+        aEvent instanceof KeyboardEvent
+      ) {
+        searchTerms = searchText.value;
+      } else {
+        searchTerms =
+          this.suggestionAtIndex(this.selectedIndex) || searchText.value;
+      }
+      // Send an event that will perform a search and Firefox Health Report will
+      // record that a search from the healthReportKey passed to the constructor.
+      let eventData = {
+        engineName: this.selectedEngineName,
+        searchString: searchTerms,
+        healthReportKey: this._healthReportKey,
+        searchPurpose: this._searchPurpose,
+        originalEvent: {
+          shiftKey: aEvent.shiftKey,
+          ctrlKey: aEvent.ctrlKey,
+          metaKey: aEvent.metaKey,
+          altKey: aEvent.altKey,
+        },
+      };
+      if ("button" in aEvent) {
+        eventData.originalEvent.button = aEvent.button;
+      }
+
+      if (this.suggestionAtIndex(this.selectedIndex)) {
+        eventData.selection = {
+          index: this.selectedIndex,
+          kind: undefined,
+        };
+        if (aEvent instanceof MouseEvent) {
+          eventData.selection.kind = "mouse";
+        } else if (aEvent instanceof KeyboardEvent) {
+          eventData.selection.kind = "key";
+        }
+      }
+
+      this._sendMsg("Search", eventData);
+      this.addInputValueToFormHistory();
+    },
+
+    _onInput() {
+      if (!this.input.value) {
+        this._stickyInputValue = "";
+        this._hideSuggestions();
+      } else if (this.input.value != this._stickyInputValue) {
+        // Only fetch new suggestions if the input value has changed.
+        this._getSuggestions();
+        this.selectAndUpdateInput(-1);
+      }
+      this._updateSearchWithHeader();
+    },
+
+    _onKeydown(event) {
+      let selectedIndexDelta = 0;
+      let selectedSuggestionDelta = 0;
+      let selectedOneOffDelta = 0;
+
+      switch (event.keyCode) {
+        case event.DOM_VK_UP:
+          if (this._table.hidden) {
+            return;
+          }
+          if (event.getModifierState("Accel")) {
+            if (event.shiftKey) {
+              selectedSuggestionDelta = -1;
+              break;
+            }
+            this._cycleCurrentEngine(true);
+            break;
+          }
+          if (event.altKey) {
+            selectedOneOffDelta = -1;
+            break;
+          }
+          selectedIndexDelta = -1;
+          break;
+        case event.DOM_VK_DOWN:
+          if (this._table.hidden) {
+            this._getSuggestions();
+            return;
+          }
+          if (event.getModifierState("Accel")) {
+            if (event.shiftKey) {
+              selectedSuggestionDelta = 1;
+              break;
+            }
+            this._cycleCurrentEngine(false);
+            break;
+          }
+          if (event.altKey) {
+            selectedOneOffDelta = 1;
+            break;
+          }
+          selectedIndexDelta = 1;
+          break;
+        case event.DOM_VK_TAB:
+          if (this._table.hidden) {
+            return;
+          }
+          // Shift+tab when either the first or no one-off is selected, as well as
+          // tab when the settings button is selected, should change focus as normal.
+          if (
+            (this.selectedButtonIndex <= 0 && event.shiftKey) ||
+            (this.selectedButtonIndex == this._oneOffButtons.length &&
+              !event.shiftKey)
+          ) {
+            return;
+          }
+          selectedOneOffDelta = event.shiftKey ? -1 : 1;
+          break;
+        case event.DOM_VK_RIGHT:
+          // Allow normal caret movement until the caret is at the end of the input.
+          if (
+            this.input.selectionStart != this.input.selectionEnd ||
+            this.input.selectionEnd != this.input.value.length
+          ) {
+            return;
+          }
+          if (
+            this.numSuggestions &&
+            this.selectedIndex >= 0 &&
+            this.selectedIndex < this.numSuggestions
+          ) {
+            this.input.value = this.suggestionAtIndex(this.selectedIndex);
+            this.input.setAttribute("selection-index", this.selectedIndex);
+            this.input.setAttribute("selection-kind", "key");
+          } else {
+            // If we didn't select anything, make sure to remove the attributes
+            // in case they were populated last time.
+            this.input.removeAttribute("selection-index");
+            this.input.removeAttribute("selection-kind");
+          }
+          this._stickyInputValue = this.input.value;
+          this._hideSuggestions();
+          return;
+        case event.DOM_VK_RETURN:
+          this._onCommand(event);
+          return;
+        case event.DOM_VK_DELETE:
+          if (this.selectedIndex >= 0) {
+            this.deleteSuggestionAtIndex(this.selectedIndex);
+          }
+          return;
+        case event.DOM_VK_ESCAPE:
+          if (!this._table.hidden) {
+            this._hideSuggestions();
+          }
+          return;
+        default:
+          return;
+      }
+
+      let currentIndex = this.selectedIndex;
+      if (selectedIndexDelta) {
+        let newSelectedIndex = currentIndex + selectedIndexDelta;
+        if (newSelectedIndex < -1) {
+          newSelectedIndex = this.numSuggestions + this._oneOffButtons.length;
+        }
+        // If are moving up from the first one off, we have to deselect the one off
+        // manually because the selectedIndex setter tries to exclude the selected
+        // one-off (which is desirable for accel+shift+up/down).
+        if (currentIndex == this.numSuggestions && selectedIndexDelta == -1) {
+          this.selectedButtonIndex = -1;
+        }
+        this.selectAndUpdateInput(newSelectedIndex);
+      } else if (selectedSuggestionDelta) {
+        let newSelectedIndex;
+        if (currentIndex >= this.numSuggestions || currentIndex == -1) {
+          // No suggestion already selected, select the first/last one appropriately.
+          newSelectedIndex =
+            selectedSuggestionDelta == 1 ? 0 : this.numSuggestions - 1;
+        } else {
+          newSelectedIndex = currentIndex + selectedSuggestionDelta;
+        }
+        if (newSelectedIndex >= this.numSuggestions) {
+          newSelectedIndex = -1;
+        }
+        this.selectAndUpdateInput(newSelectedIndex);
+      } else if (selectedOneOffDelta) {
+        let newSelectedIndex;
+        let currentButton = this.selectedButtonIndex;
+        if (
+          currentButton == -1 ||
+          currentButton == this._oneOffButtons.length
+        ) {
+          // No one-off already selected, select the first/last one appropriately.
+          newSelectedIndex =
+            selectedOneOffDelta == 1 ? 0 : this._oneOffButtons.length - 1;
+        } else {
+          newSelectedIndex = currentButton + selectedOneOffDelta;
+        }
+        // Allow selection of the settings button via the tab key.
+        if (
+          newSelectedIndex == this._oneOffButtons.length &&
+          event.keyCode != event.DOM_VK_TAB
+        ) {
+          newSelectedIndex = -1;
+        }
+        this.selectedButtonIndex = newSelectedIndex;
+      }
+
+      // Prevent the input's caret from moving.
+      event.preventDefault();
+    },
+
+    _currentEngineIndex: -1,
+    _cycleCurrentEngine(aReverse) {
+      if (
+        (this._currentEngineIndex == this._engines.length - 1 && !aReverse) ||
+        (this._currentEngineIndex == 0 && aReverse)
+      ) {
+        return;
+      }
+      this._currentEngineIndex += aReverse ? -1 : 1;
+      let engineName = this._engines[this._currentEngineIndex].name;
+      this._sendMsg("SetCurrentEngine", engineName);
+    },
+
+    _onFocus() {
+      if (this._mousedown) {
+        return;
+      }
+      // When the input box loses focus to something in our table, we refocus it
+      // immediately. This causes the focus highlight to flicker, so we set a
+      // custom attribute which consumers should use for focus highlighting. This
+      // attribute is removed only when we do not immediately refocus the input
+      // box, thus eliminating flicker.
+      this.input.setAttribute("keepfocus", "true");
+      this._speculativeConnect();
+    },
+
+    _onBlur() {
+      if (this._mousedown) {
+        // At this point, this.input has lost focus, but a new element has not yet
+        // received it. If we re-focus this.input directly, the new element will
+        // steal focus immediately, so we queue it instead.
+        setTimeout(() => this.input.focus(), 0);
+        return;
+      }
+      this.input.removeAttribute("keepfocus");
+      this._hideSuggestions();
+    },
+
+    _onMousemove(event) {
+      let idx = this._indexOfTableItem(event.target);
+      if (idx >= this.numSuggestions) {
+        // Deselect any search suggestion that has been selected.
+        this.selectedIndex = -1;
+        this.selectedButtonIndex = idx - this.numSuggestions;
+        return;
+      }
+      this.selectedIndex = idx;
+    },
+
+    _onMouseup(event) {
+      if (event.button == 2) {
+        return;
+      }
+      this._onCommand(event);
+    },
+
+    _onMouseout(event) {
+      // We only deselect one-off buttons and the settings button when they are
+      // moused out.
+      let idx = this._indexOfTableItem(event.originalTarget);
+      if (idx >= this.numSuggestions) {
+        this.selectedButtonIndex = -1;
+      }
+    },
+
+    _onClick(event) {
+      this._onMouseup(event);
+    },
+
+    _onContentSearchService(event) {
+      let methodName = "_onMsg" + event.detail.type;
+      if (methodName in this) {
+        this[methodName](event.detail.data);
+      }
+    },
+
+    _onMsgFocusInput(event) {
+      this.input.focus();
+    },
+
+    _onMsgBlur(event) {
+      this.input.blur();
+      this._hideSuggestions();
+    },
+
+    _onMsgSuggestions(suggestions) {
+      // Ignore the suggestions if their search string or engine doesn't match
+      // ours.  Due to the async nature of message passing, this can easily happen
+      // when the user types quickly.
+      if (
+        this._stickyInputValue != suggestions.searchString ||
+        this.defaultEngine.name != suggestions.engineName
+      ) {
+        return;
+      }
+
+      this._clearSuggestionRows();
+
+      // Position and size the table.
+      let { left } = this.input.getBoundingClientRect();
+      this._table.style.top = this.input.offsetHeight + "px";
+      this._table.style.minWidth = this.input.offsetWidth + "px";
+      this._table.style.maxWidth = window.innerWidth - left - 40 + "px";
+
+      // Add the suggestions to the table.
+      let searchWords = new Set(
+        suggestions.searchString.trim().toLowerCase().split(/\s+/)
+      );
+      for (let i = 0; i < MAX_DISPLAYED_SUGGESTIONS; i++) {
+        let type, idx;
+        if (i < suggestions.formHistory.length) {
+          [type, idx] = ["formHistory", i];
+        } else {
+          let j = i - suggestions.formHistory.length;
+          if (j < suggestions.remote.length) {
+            [type, idx] = ["remote", j];
+          } else {
+            break;
+          }
+        }
+        this._suggestionsList.appendChild(
+          this._makeTableRow(type, suggestions[type][idx], i, searchWords)
+        );
+      }
+
+      if (this._table.hidden) {
+        this.selectedIndex = -1;
+        if (this._pendingOneOffRefresh) {
+          this._setUpOneOffButtons();
+          delete this._pendingOneOffRefresh;
+        }
+        this._currentEngineIndex = this._engines.findIndex(
+          aEngine => aEngine.name == this.defaultEngine.name
+        );
+        this._table.hidden = false;
+        this.input.setAttribute("aria-expanded", "true");
+      }
+    },
+
+    _onMsgSuggestionsCancelled() {
+      if (!this._table.hidden) {
+        this._hideSuggestions();
+      }
+    },
+
+    _onMsgState(state) {
+      // Not all state messages broadcast the windows' privateness info.
+      if ("isPrivateWindow" in state) {
+        this._isPrivateEngine = state.isPrivateEngine;
+      }
+
+      this.engines = state.engines;
+
+      let currentEngine = state.currentEngine;
+      if (this._isPrivateEngine) {
+        currentEngine = state.currentPrivateEngine;
+      }
+
+      // No point updating the default engine (and the header) if there's no change.
+      if (
+        this.defaultEngine &&
+        this.defaultEngine.name == currentEngine.name &&
+        this.defaultEngine.icon == currentEngine.icon
+      ) {
+        return;
+      }
+      this.defaultEngine = currentEngine;
+    },
+
+    _onMsgCurrentState(state) {
+      this._onMsgState(state);
+    },
+
+    _onMsgCurrentEngine(engine) {
+      if (this._isPrivateEngine) {
+        return;
+      }
+      this.defaultEngine = engine;
+      this._pendingOneOffRefresh = true;
+    },
+
+    _onMsgCurrentPrivateEngine(engine) {
+      if (!this._isPrivateEngine) {
+        return;
+      }
+      this.defaultEngine = engine;
+      this._pendingOneOffRefresh = true;
+    },
+
+    _onMsgStrings(strings) {
+      this._strings = strings;
+      this._updateDefaultEngineHeader();
+      this._updateSearchWithHeader();
+      document.getElementById("contentSearchSettingsButton").textContent =
+        this._strings.searchSettings;
+    },
+
+    _updateDefaultEngineIcon() {
+      // 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
+      let icon = this.defaultEngine.isAppProvided
+        ? this.defaultEngine.icon
+        : "chrome://global/skin/icons/search-glass.svg";
+
+      document.body.style.setProperty(
+        "--newtab-search-icon",
+        "url(" + icon + ")"
+      );
+    },
+
+    _updateDefaultEngineHeader() {
+      let header = document.getElementById("contentSearchDefaultEngineHeader");
+      header.firstChild.setAttribute("src", this.defaultEngine.icon);
+      if (!this._strings) {
+        return;
+      }
+      while (header.firstChild.nextSibling) {
+        header.firstChild.nextSibling.remove();
+      }
+      header.appendChild(
+        document.createTextNode(
+          this._strings.searchHeader.replace("%S", this.defaultEngine.name)
+        )
+      );
+    },
+
+    _updateSearchWithHeader() {
+      if (!this._strings) {
+        return;
+      }
+      let searchWithHeader = document.getElementById(
+        "contentSearchSearchWithHeader"
+      );
+      let labels = searchWithHeader.querySelectorAll("label");
+      if (this.input.value) {
+        let header = this._strings.searchForSomethingWith2;
+        // Translators can use both %S and %1$S.
+        header = header.replace("%1$S", "%S").split("%S");
+        labels[0].textContent = header[0];
+        labels[1].textContent = this.input.value;
+        labels[2].textContent = header[1];
+      } else {
+        labels[0].textContent = this._strings.searchWithHeader;
+        labels[1].textContent = "";
+        labels[2].textContent = "";
+      }
+    },
+
+    _speculativeConnect() {
+      if (this.defaultEngine) {
+        this._sendMsg("SpeculativeConnect", this.defaultEngine.name);
+      }
+    },
+
+    _makeTableRow(type, suggestionStr, currentRow, searchWords) {
+      let row = document.createElementNS(HTML_NS, "tr");
+      row.dir = "auto";
+      row.classList.add("contentSearchSuggestionRow");
+      row.classList.add(type);
+      row.setAttribute("role", "presentation");
+      row.addEventListener("mousemove", this);
+      row.addEventListener("mouseup", this);
+
+      let entry = document.createElementNS(HTML_NS, "td");
+      let img = document.createElementNS(HTML_NS, "div");
+      img.setAttribute("class", "historyIcon");
+      entry.appendChild(img);
+      entry.classList.add("contentSearchSuggestionEntry");
+      entry.setAttribute("role", "option");
+      entry.id = this._idPrefix + SUGGESTION_ID_PREFIX + currentRow;
+      entry.setAttribute("aria-selected", "false");
+
+      let suggestionWords = suggestionStr.trim().toLowerCase().split(/\s+/);
+      for (let i = 0; i < suggestionWords.length; i++) {
+        let word = suggestionWords[i];
+        let wordSpan = document.createElementNS(HTML_NS, "span");
+        if (searchWords.has(word)) {
+          wordSpan.classList.add("typed");
+        }
+        wordSpan.textContent = word;
+        entry.appendChild(wordSpan);
+        if (i < suggestionWords.length - 1) {
+          entry.appendChild(document.createTextNode(" "));
+        }
+      }
+
+      row.appendChild(entry);
+      return row;
+    },
+
+    // If the favicon is an array buffer, convert it into a Blob URI.
+    // Otherwise just return the plain URI.
+    _getFaviconURIFromIconData(data) {
+      if (typeof data == "string") {
+        return data;
+      }
+
+      // If typeof(data) != "string", we assume it's an ArrayBuffer
+      let blob = new Blob([data]);
+      return URL.createObjectURL(blob);
+    },
+
+    // Adds "@2x" to the name of the given PNG url for "retina" screens.
+    _getImageURIForCurrentResolution(uri) {
+      if (window.devicePixelRatio > 1) {
+        return uri.replace(/\.png$/, "@2x.png");
+      }
+      return uri;
+    },
+
+    _getSearchEngines() {
+      this._sendMsg("GetState");
+    },
+
+    _getStrings() {
+      this._sendMsg("GetStrings");
+    },
+
+    _getSuggestions() {
+      this._stickyInputValue = this.input.value;
+      if (this.defaultEngine) {
+        this._sendMsg("GetSuggestions", {
+          engineName: this.defaultEngine.name,
+          searchString: this.input.value,
+        });
+      }
+    },
+
+    _clearSuggestionRows() {
+      while (this._suggestionsList.firstElementChild) {
+        this._suggestionsList.firstElementChild.remove();
+      }
+    },
+
+    _hideSuggestions() {
+      this.input.setAttribute("aria-expanded", "false");
+      this.selectedIndex = -1;
+      this.selectedButtonIndex = -1;
+      this._currentEngineIndex = -1;
+      this._table.hidden = true;
+    },
+
+    _indexOfTableItem(elt) {
+      if (elt.classList.contains("contentSearchOneOffItem")) {
+        return this.numSuggestions + this._oneOffButtons.indexOf(elt);
+      }
+      if (elt.classList.contains("contentSearchSettingsButton")) {
+        return this.numSuggestions + this._oneOffButtons.length;
+      }
+      while (elt && elt.localName != "tr") {
+        elt = elt.parentNode;
+      }
+      if (!elt) {
+        throw new Error("Element is not a row");
+      }
+      return elt.rowIndex;
+    },
+
+    _makeTable(id) {
+      this._table = document.createElementNS(HTML_NS, "table");
+      this._table.id = id;
+      this._table.hidden = true;
+      this._table.classList.add("contentSearchSuggestionTable");
+      this._table.setAttribute("role", "presentation");
+
+      // When the search input box loses focus, we want to immediately give focus
+      // back to it if the blur was because the user clicked somewhere in the table.
+      // onBlur uses the _mousedown flag to detect this.
+      this._table.addEventListener("mousedown", () => {
+        this._mousedown = true;
+      });
+      document.addEventListener("mouseup", () => {
+        delete this._mousedown;
+      });
+
+      // Deselect the selected element on mouseout if it wasn't a suggestion.
+      this._table.addEventListener("mouseout", this);
+
+      let headerRow = document.createElementNS(HTML_NS, "tr");
+      let header = document.createElementNS(HTML_NS, "td");
+      headerRow.setAttribute("class", "contentSearchHeaderRow");
+      header.setAttribute("class", "contentSearchHeader");
+      let iconImg = document.createElementNS(HTML_NS, "img");
+      header.appendChild(iconImg);
+      header.id = "contentSearchDefaultEngineHeader";
+      headerRow.appendChild(header);
+      headerRow.addEventListener("click", this);
+      this._table.appendChild(headerRow);
+
+      let row = document.createElementNS(HTML_NS, "tr");
+      row.setAttribute("class", "contentSearchSuggestionsContainer");
+      let cell = document.createElementNS(HTML_NS, "td");
+      cell.setAttribute("class", "contentSearchSuggestionsContainer");
+      this._suggestionsList = document.createElementNS(HTML_NS, "table");
+      this._suggestionsList.setAttribute(
+        "class",
+        "contentSearchSuggestionsList"
+      );
+      cell.appendChild(this._suggestionsList);
+      row.appendChild(cell);
+      this._table.appendChild(row);
+      this._suggestionsList.setAttribute("role", "listbox");
+
+      this._oneOffsTable = document.createElementNS(HTML_NS, "table");
+      this._oneOffsTable.setAttribute("class", "contentSearchOneOffsTable");
+      this._oneOffsTable.classList.add("contentSearchSuggestionsContainer");
+      this._oneOffsTable.setAttribute("role", "group");
+      this._table.appendChild(this._oneOffsTable);
+
+      headerRow = document.createElementNS(HTML_NS, "tr");
+      header = document.createElementNS(HTML_NS, "td");
+      headerRow.setAttribute("class", "contentSearchHeaderRow");
+      header.setAttribute("class", "contentSearchHeader");
+      headerRow.appendChild(header);
+      header.id = "contentSearchSearchWithHeader";
+      let start = document.createElement("label");
+      let inputLabel = document.createElement("label");
+      inputLabel.setAttribute(
+        "class",
+        "contentSearchSearchWithHeaderSearchText"
+      );
+      let end = document.createElement("label");
+      header.appendChild(start);
+      header.appendChild(inputLabel);
+      header.appendChild(end);
+      this._oneOffsTable.appendChild(headerRow);
+
+      let button = document.createElementNS(HTML_NS, "button");
+      button.setAttribute("class", "contentSearchSettingsButton");
+      button.classList.add("contentSearchHeaderRow");
+      button.classList.add("contentSearchHeader");
+      button.id = "contentSearchSettingsButton";
+      button.addEventListener("click", this);
+      button.addEventListener("mousemove", this);
+      this._table.appendChild(button);
+
+      return this._table;
+    },
+
+    _setUpOneOffButtons() {
+      // Sometimes we receive a CurrentEngine message from the ContentSearch service
+      // before we've received a State message - i.e. before we have our engines.
+      if (!this._engines) {
+        return;
+      }
+
+      while (this._oneOffsTable.firstChild.nextSibling) {
+        this._oneOffsTable.firstChild.nextSibling.remove();
+      }
+
+      this._oneOffButtons = [];
+
+      let engines = this._engines
+        .filter(aEngine => aEngine.name != this.defaultEngine.name)
+        .filter(aEngine => !aEngine.hidden);
+      if (!engines.length) {
+        this._oneOffsTable.hidden = true;
+        return;
+      }
+
+      const kDefaultButtonWidth = 49; // 48px + 1px border.
+      let rowWidth = this.input.offsetWidth - 2; // 2px border.
+      let enginesPerRow = Math.floor(rowWidth / kDefaultButtonWidth);
+      let buttonWidth = Math.floor(rowWidth / enginesPerRow);
+
+      let row = document.createElementNS(HTML_NS, "tr");
+      let cell = document.createElementNS(HTML_NS, "td");
+      row.setAttribute("class", "contentSearchSuggestionsContainer");
+      cell.setAttribute("class", "contentSearchSuggestionsContainer");
+
+      for (let i = 0; i < engines.length; ++i) {
+        let engine = engines[i];
+        if (i > 0 && i % enginesPerRow == 0) {
+          row.appendChild(cell);
+          this._oneOffsTable.appendChild(row);
+          row = document.createElementNS(HTML_NS, "tr");
+          cell = document.createElementNS(HTML_NS, "td");
+          row.setAttribute("class", "contentSearchSuggestionsContainer");
+          cell.setAttribute("class", "contentSearchSuggestionsContainer");
+        }
+        let button = document.createElementNS(HTML_NS, "button");
+        button.setAttribute("class", "contentSearchOneOffItem");
+        let img = document.createElementNS(HTML_NS, "img");
+        let uri;
+        if (engine.iconData) {
+          uri = this._getFaviconURIFromIconData(engine.iconData);
+        } else {
+          uri = this._getImageURIForCurrentResolution(
+            "chrome://browser/skin/search-engine-placeholder.png"
+          );
+        }
+        img.setAttribute("src", uri);
+        img.addEventListener(
+          "load",
+          function () {
+            URL.revokeObjectURL(uri);
+          },
+          { once: true }
+        );
+        button.appendChild(img);
+        button.style.width = buttonWidth + "px";
+        button.setAttribute("engine-name", engine.name);
+
+        button.engineName = engine.name;
+        button.addEventListener("click", this);
+        button.addEventListener("mousemove", this);
+
+        if (engines.length - i <= enginesPerRow - (i % enginesPerRow)) {
+          button.classList.add("last-row");
+        }
+
+        if ((i + 1) % enginesPerRow == 0) {
+          button.classList.add("end-of-row");
+        }
+
+        button.id = ONE_OFF_ID_PREFIX + i;
+        cell.appendChild(button);
+        this._oneOffButtons.push(button);
+      }
+      row.appendChild(cell);
+      this._oneOffsTable.appendChild(row);
+      this._oneOffsTable.hidden = false;
+    },
+
+    _sendMsg(type, data = null) {
+      dispatchEvent(
+        new CustomEvent("ContentSearchClient", {
+          detail: {
+            type,
+            data,
+          },
+        })
+      );
+    },
+  };
+
+  return ContentSearchUIController;
+})();
diff --git a/browser/components/search/content/searchbar.js b/browser/components/search/content/searchbar.js
new file mode 100644
index 0000000000..e8b2dd5045
--- /dev/null
+++ b/browser/components/search/content/searchbar.js
@@ -0,0 +1,895 @@
+/* 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/. */
+
+"use strict";
+
+/* globals XULCommandEvent */
+
+// This is loaded into chrome windows with the subscript loader. Wrap in
+// a block to prevent accidentally leaking globals onto `window`.
+{
+  const lazy = {};
+
+  ChromeUtils.defineESModuleGetters(lazy, {
+    FormHistory: "resource://gre/modules/FormHistory.sys.mjs",
+    SearchSuggestionController:
+      "resource://gre/modules/SearchSuggestionController.sys.mjs",
+  });
+
+  /**
+   * Defines the search bar element.
+   */
+  class MozSearchbar extends MozXULElement {
+    static get inheritedAttributes() {
+      return {
+        ".searchbar-textbox":
+          "disabled,disableautocomplete,searchengine,src,newlines",
+        ".searchbar-search-button": "addengines",
+      };
+    }
+
+    static get markup() {
+      return `
+        <stringbundle src="chrome://browser/locale/search.properties"></stringbundle>
+        <hbox class="searchbar-search-button" data-l10n-id="searchbar-icon">
+          <image class="searchbar-search-icon"></image>
+          <image class="searchbar-search-icon-overlay"></image>
+        </hbox>
+        <html:input class="searchbar-textbox" is="autocomplete-input" type="search" data-l10n-id="searchbar-input" autocompletepopup="PopupSearchAutoComplete" autocompletesearch="search-autocomplete" autocompletesearchparam="searchbar-history" maxrows="10" completeselectedindex="true" minresultsforpopup="0"/>
+        <menupopup class="textbox-contextmenu"></menupopup>
+        <hbox class="search-go-container" align="center">
+          <image class="search-go-button urlbar-icon" hidden="true" onclick="handleSearchCommand(event);" data-l10n-id="searchbar-submit"></image>
+        </hbox>
+      `;
+    }
+
+    constructor() {
+      super();
+
+      MozXULElement.insertFTLIfNeeded("browser/search.ftl");
+
+      this.destroy = this.destroy.bind(this);
+      this._setupEventListeners();
+      let searchbar = this;
+      this.observer = {
+        observe(aEngine, aTopic, aVerb) {
+          if (
+            aTopic == "browser-search-engine-modified" ||
+            (aTopic == "browser-search-service" && aVerb == "init-complete")
+          ) {
+            // Make sure the engine list is refetched next time it's needed
+            searchbar._engines = null;
+
+            // Update the popup header and update the display after any modification.
+            searchbar._textbox.popup.updateHeader();
+            searchbar.updateDisplay();
+          }
+        },
+        QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+      };
+
+      this._ignoreFocus = false;
+      this._engines = null;
+      this.telemetrySelectedIndex = -1;
+    }
+
+    connectedCallback() {
+      // Don't initialize if this isn't going to be visible
+      if (this.closest("#BrowserToolbarPalette")) {
+        return;
+      }
+
+      this.appendChild(this.constructor.fragment);
+      this.initializeAttributeInheritance();
+
+      // Don't go further if in Customize mode.
+      if (this.parentNode.parentNode.localName == "toolbarpaletteitem") {
+        return;
+      }
+
+      // Ensure we get persisted widths back, if we've been in the palette:
+      let storedWidth = Services.xulStore.getValue(
+        document.documentURI,
+        this.parentNode.id,
+        "width"
+      );
+      if (storedWidth) {
+        this.parentNode.setAttribute("width", storedWidth);
+        this.parentNode.style.width = storedWidth + "px";
+      }
+
+      this._stringBundle = this.querySelector("stringbundle");
+      this._textbox = this.querySelector(".searchbar-textbox");
+
+      this._menupopup = null;
+      this._pasteAndSearchMenuItem = null;
+
+      this._setupTextboxEventListeners();
+      this._initTextbox();
+
+      window.addEventListener("unload", this.destroy);
+
+      Services.obs.addObserver(this.observer, "browser-search-engine-modified");
+      Services.obs.addObserver(this.observer, "browser-search-service");
+
+      this._initialized = true;
+
+      (window.delayedStartupPromise || Promise.resolve()).then(() => {
+        window.requestIdleCallback(() => {
+          Services.search
+            .init()
+            .then(aStatus => {
+              // Bail out if the binding's been destroyed
+              if (!this._initialized) {
+                return;
+              }
+
+              // Refresh the display (updating icon, etc)
+              this.updateDisplay();
+              BrowserSearch.updateOpenSearchBadge();
+            })
+            .catch(status =>
+              console.error(
+                "Cannot initialize search service, bailing out: " + status
+              )
+            );
+        });
+      });
+
+      // Wait until the popupshowing event to avoid forcing immediate
+      // attachment of the search-one-offs binding.
+      this.textbox.popup.addEventListener(
+        "popupshowing",
+        () => {
+          let oneOffButtons = this.textbox.popup.oneOffButtons;
+          // Some accessibility tests create their own <searchbar> that doesn't
+          // use the popup binding below, so null-check oneOffButtons.
+          if (oneOffButtons) {
+            oneOffButtons.telemetryOrigin = "searchbar";
+            // Set .textbox first, since the popup setter will cause
+            // a _rebuild call that uses it.
+            oneOffButtons.textbox = this.textbox;
+            oneOffButtons.popup = this.textbox.popup;
+          }
+        },
+        { capture: true, once: true }
+      );
+    }
+
+    async getEngines() {
+      if (!this._engines) {
+        this._engines = await Services.search.getVisibleEngines();
+      }
+      return this._engines;
+    }
+
+    set currentEngine(val) {
+      if (PrivateBrowsingUtils.isWindowPrivate(window)) {
+        Services.search.setDefaultPrivate(
+          val,
+          Ci.nsISearchService.CHANGE_REASON_USER_SEARCHBAR
+        );
+      } else {
+        Services.search.setDefault(
+          val,
+          Ci.nsISearchService.CHANGE_REASON_USER_SEARCHBAR
+        );
+      }
+    }
+
+    get currentEngine() {
+      let currentEngine;
+      if (PrivateBrowsingUtils.isWindowPrivate(window)) {
+        currentEngine = Services.search.defaultPrivateEngine;
+      } else {
+        currentEngine = Services.search.defaultEngine;
+      }
+      // Return a dummy engine if there is no currentEngine
+      return currentEngine || { name: "", uri: null };
+    }
+
+    /**
+     * textbox is used by sanitize.js to clear the undo history when
+     * clearing form information.
+     *
+     * @returns {HTMLInputElement}
+     */
+    get textbox() {
+      return this._textbox;
+    }
+
+    set value(val) {
+      this._textbox.value = val;
+    }
+
+    get value() {
+      return this._textbox.value;
+    }
+
+    destroy() {
+      if (this._initialized) {
+        this._initialized = false;
+        window.removeEventListener("unload", this.destroy);
+
+        Services.obs.removeObserver(
+          this.observer,
+          "browser-search-engine-modified"
+        );
+        Services.obs.removeObserver(this.observer, "browser-search-service");
+      }
+
+      // Make sure to break the cycle from _textbox to us. Otherwise we leak
+      // the world. But make sure it's actually pointing to us.
+      // Also make sure the textbox has ever been constructed, otherwise the
+      // _textbox getter will cause the textbox constructor to run, add an
+      // observer, and leak the world too.
+      if (
+        this._textbox &&
+        this._textbox.mController &&
+        this._textbox.mController.input &&
+        this._textbox.mController.input.wrappedJSObject ==
+          this.nsIAutocompleteInput
+      ) {
+        this._textbox.mController.input = null;
+      }
+    }
+
+    focus() {
+      this._textbox.focus();
+    }
+
+    select() {
+      this._textbox.select();
+    }
+
+    setIcon(element, uri) {
+      element.setAttribute("src", uri);
+    }
+
+    updateDisplay() {
+      this._textbox.title = this._stringBundle.getFormattedString("searchtip", [
+        this.currentEngine.name,
+      ]);
+    }
+
+    updateGoButtonVisibility() {
+      this.querySelector(".search-go-button").hidden = !this._textbox.value;
+    }
+
+    openSuggestionsPanel(aShowOnlySettingsIfEmpty) {
+      if (this._textbox.open) {
+        return;
+      }
+
+      this._textbox.showHistoryPopup();
+
+      if (this._textbox.value) {
+        // showHistoryPopup does a startSearch("") call, ensure the
+        // controller handles the text from the input box instead:
+        this._textbox.mController.handleText();
+      } else if (aShowOnlySettingsIfEmpty) {
+        this.setAttribute("showonlysettings", "true");
+      }
+    }
+
+    async selectEngine(aEvent, isNextEngine) {
+      // Stop event bubbling now, because the rest of this method is async.
+      aEvent.preventDefault();
+      aEvent.stopPropagation();
+
+      // Find the new index.
+      let engines = await this.getEngines();
+      let currentName = this.currentEngine.name;
+      let newIndex = -1;
+      let lastIndex = engines.length - 1;
+      for (let i = lastIndex; i >= 0; --i) {
+        if (engines[i].name == currentName) {
+          // Check bounds to cycle through the list of engines continuously.
+          if (!isNextEngine && i == 0) {
+            newIndex = lastIndex;
+          } else if (isNextEngine && i == lastIndex) {
+            newIndex = 0;
+          } else {
+            newIndex = i + (isNextEngine ? 1 : -1);
+          }
+          break;
+        }
+      }
+
+      this.currentEngine = engines[newIndex];
+
+      this.openSuggestionsPanel();
+    }
+
+    handleSearchCommand(aEvent, aEngine, aForceNewTab) {
+      let where = "current";
+      let params;
+      const newTabPref = Services.prefs.getBoolPref("browser.search.openintab");
+
+      // Open ctrl/cmd clicks on one-off buttons in a new background tab.
+      if (
+        aEvent &&
+        aEvent.originalTarget.classList.contains("search-go-button")
+      ) {
+        if (aEvent.button == 2) {
+          return;
+        }
+        where = whereToOpenLink(aEvent, false, true);
+        if (
+          newTabPref &&
+          !aEvent.altKey &&
+          !aEvent.getModifierState("AltGraph") &&
+          where == "current" &&
+          !gBrowser.selectedTab.isEmpty
+        ) {
+          where = "tab";
+        }
+      } else if (aForceNewTab) {
+        where = "tab";
+        if (Services.prefs.getBoolPref("browser.tabs.loadInBackground")) {
+          where += "-background";
+        }
+      } else {
+        if (
+          (KeyboardEvent.isInstance(aEvent) &&
+            (aEvent.altKey || aEvent.getModifierState("AltGraph"))) ^
+            newTabPref &&
+          !gBrowser.selectedTab.isEmpty
+        ) {
+          where = "tab";
+        }
+        if (
+          MouseEvent.isInstance(aEvent) &&
+          (aEvent.button == 1 || aEvent.getModifierState("Accel"))
+        ) {
+          where = "tab";
+          params = {
+            inBackground: true,
+          };
+        }
+      }
+      this.handleSearchCommandWhere(aEvent, aEngine, where, params);
+    }
+
+    handleSearchCommandWhere(aEvent, aEngine, aWhere, aParams = {}) {
+      let textBox = this._textbox;
+      let textValue = textBox.value;
+
+      let selectedIndex = this.telemetrySelectedIndex;
+      let isOneOff = false;
+
+      BrowserSearchTelemetry.recordSearchSuggestionSelectionMethod(
+        aEvent,
+        "searchbar",
+        selectedIndex
+      );
+
+      if (selectedIndex == -1) {
+        isOneOff =
+          this.textbox.popup.oneOffButtons.eventTargetIsAOneOff(aEvent);
+      }
+
+      if (aWhere === "tab" && !!aParams.inBackground) {
+        // Keep the focus in the search bar.
+        aParams.avoidBrowserFocus = true;
+      } else if (
+        aWhere !== "window" &&
+        aEvent.keyCode === KeyEvent.DOM_VK_RETURN
+      ) {
+        // Move the focus to the selected browser when keyup the Enter.
+        aParams.avoidBrowserFocus = true;
+        this._needBrowserFocusAtEnterKeyUp = true;
+      }
+
+      // This is a one-off search only if oneOffRecorded is true.
+      this.doSearch(textValue, aWhere, aEngine, aParams, isOneOff);
+    }
+
+    doSearch(aData, aWhere, aEngine, aParams, isOneOff = false) {
+      let textBox = this._textbox;
+      let engine = aEngine || this.currentEngine;
+
+      // Save the current value in the form history
+      if (
+        aData &&
+        !PrivateBrowsingUtils.isWindowPrivate(window) &&
+        lazy.FormHistory.enabled &&
+        aData.length <=
+          lazy.SearchSuggestionController.SEARCH_HISTORY_MAX_VALUE_LENGTH
+      ) {
+        lazy.FormHistory.update({
+          op: "bump",
+          fieldname: textBox.getAttribute("autocompletesearchparam"),
+          value: aData,
+          source: engine.name,
+        }).catch(error =>
+          console.error(
+            "Saving search to form history failed: " + error.message
+          )
+        );
+      }
+
+      let submission = engine.getSubmission(aData, null, "searchbar");
+
+      // If we hit here, we come either from a one-off, a plain search or a suggestion.
+      const details = {
+        isOneOff,
+        isSuggestion: !isOneOff && this.telemetrySelectedIndex != -1,
+        url: submission.uri,
+      };
+
+      this.telemetrySelectedIndex = -1;
+
+      BrowserSearchTelemetry.recordSearch(
+        gBrowser.selectedBrowser,
+        engine,
+        "searchbar",
+        details
+      );
+      // null parameter below specifies HTML response for search
+      let params = {
+        postData: submission.postData,
+        globalHistoryOptions: {
+          triggeringSearchEngine: engine.name,
+        },
+      };
+      if (aParams) {
+        for (let key in aParams) {
+          params[key] = aParams[key];
+        }
+      }
+      openTrustedLinkIn(submission.uri.spec, aWhere, params);
+    }
+
+    disconnectedCallback() {
+      this.destroy();
+      while (this.firstChild) {
+        this.firstChild.remove();
+      }
+    }
+
+    /**
+     * Determines if we should select all the text in the searchbar based on the
+     * searchbar state, and whether the selection is empty.
+     */
+    _maybeSelectAll() {
+      if (
+        !this._preventClickSelectsAll &&
+        document.activeElement == this._textbox &&
+        this._textbox.selectionStart == this._textbox.selectionEnd
+      ) {
+        this.select();
+      }
+    }
+
+    _setupEventListeners() {
+      this.addEventListener("click", event => {
+        this._maybeSelectAll();
+      });
+
+      this.addEventListener(
+        "DOMMouseScroll",
+        event => {
+          if (event.getModifierState("Accel")) {
+            this.selectEngine(event, event.detail > 0);
+          }
+        },
+        true
+      );
+
+      this.addEventListener("input", event => {
+        this.updateGoButtonVisibility();
+      });
+
+      this.addEventListener("drop", event => {
+        this.updateGoButtonVisibility();
+      });
+
+      this.addEventListener(
+        "blur",
+        event => {
+          // Reset the flag since we can't capture enter keyup event if the event happens
+          // after moving the focus.
+          this._needBrowserFocusAtEnterKeyUp = false;
+
+          // If the input field is still focused then a different window has
+          // received focus, ignore the next focus event.
+          this._ignoreFocus = document.activeElement == this._textbox;
+        },
+        true
+      );
+
+      this.addEventListener(
+        "focus",
+        event => {
+          // Speculatively connect to the current engine's search URI (and
+          // suggest URI, if different) to reduce request latency
+          this.currentEngine.speculativeConnect({
+            window,
+            originAttributes: gBrowser.contentPrincipal.originAttributes,
+          });
+
+          if (this._ignoreFocus) {
+            // This window has been re-focused, don't show the suggestions
+            this._ignoreFocus = false;
+            return;
+          }
+
+          // Don't open the suggestions if there is no text in the textbox.
+          if (!this._textbox.value) {
+            return;
+          }
+
+          // Don't open the suggestions if the mouse was used to focus the
+          // textbox, that will be taken care of in the click handler.
+          if (
+            Services.focus.getLastFocusMethod(window) &
+            Services.focus.FLAG_BYMOUSE
+          ) {
+            return;
+          }
+
+          this.openSuggestionsPanel();
+        },
+        true
+      );
+
+      this.addEventListener("mousedown", event => {
+        this._preventClickSelectsAll = this._textbox.focused;
+        // Ignore right clicks
+        if (event.button != 0) {
+          return;
+        }
+
+        // Ignore clicks on the search go button.
+        if (event.originalTarget.classList.contains("search-go-button")) {
+          return;
+        }
+
+        // Ignore clicks on menu items in the input's context menu.
+        if (event.originalTarget.localName == "menuitem") {
+          return;
+        }
+
+        let isIconClick = event.originalTarget.classList.contains(
+          "searchbar-search-button"
+        );
+
+        // Hide popup when icon is clicked while popup is open
+        if (isIconClick && this.textbox.popup.popupOpen) {
+          this.textbox.popup.closePopup();
+        } else if (isIconClick || this._textbox.value) {
+          // Open the suggestions whenever clicking on the search icon or if there
+          // is text in the textbox.
+          this.openSuggestionsPanel(true);
+        }
+      });
+    }
+
+    _setupTextboxEventListeners() {
+      this.textbox.addEventListener("input", event => {
+        this.textbox.popup.removeAttribute("showonlysettings");
+      });
+
+      this.textbox.addEventListener("dragover", event => {
+        let types = event.dataTransfer.types;
+        if (
+          types.includes("text/plain") ||
+          types.includes("text/x-moz-text-internal")
+        ) {
+          event.preventDefault();
+        }
+      });
+
+      this.textbox.addEventListener("drop", event => {
+        let dataTransfer = event.dataTransfer;
+        let data = dataTransfer.getData("text/plain");
+        if (!data) {
+          data = dataTransfer.getData("text/x-moz-text-internal");
+        }
+        if (data) {
+          event.preventDefault();
+          this.textbox.value = data;
+          this.openSuggestionsPanel();
+        }
+      });
+
+      this.textbox.addEventListener("contextmenu", event => {
+        if (!this._menupopup) {
+          this._buildContextMenu();
+        }
+
+        this._textbox.closePopup();
+
+        // Make sure the context menu isn't opened via keyboard shortcut. Check for text selection
+        // before updating the state of any menu items.
+        if (event.button) {
+          this._maybeSelectAll();
+        }
+
+        // Update disabled state of menu items
+        for (let item of this._menupopup.querySelectorAll("menuitem[cmd]")) {
+          let command = item.getAttribute("cmd");
+          let controller =
+            document.commandDispatcher.getControllerForCommand(command);
+          item.disabled = !controller.isCommandEnabled(command);
+        }
+
+        let pasteEnabled = document.commandDispatcher
+          .getControllerForCommand("cmd_paste")
+          .isCommandEnabled("cmd_paste");
+        this._pasteAndSearchMenuItem.disabled = !pasteEnabled;
+
+        this._menupopup.openPopupAtScreen(event.screenX, event.screenY, true);
+
+        event.preventDefault();
+      });
+    }
+
+    _initTextbox() {
+      if (this.parentNode.parentNode.localName == "toolbarpaletteitem") {
+        return;
+      }
+
+      this.setAttribute("role", "combobox");
+      this.setAttribute("aria-owns", this.textbox.popup.id);
+
+      // This overrides the searchParam property in autocomplete.xml. We're
+      // hijacking this property as a vehicle for delivering the privacy
+      // information about the window into the guts of nsSearchSuggestions.
+      // Note that the setter is the same as the parent. We were not sure whether
+      // we can override just the getter. If that proves to be the case, the setter
+      // can be removed.
+      Object.defineProperty(this.textbox, "searchParam", {
+        get() {
+          return (
+            this.getAttribute("autocompletesearchparam") +
+            (PrivateBrowsingUtils.isWindowPrivate(window) ? "|private" : "")
+          );
+        },
+        set(val) {
+          this.setAttribute("autocompletesearchparam", val);
+        },
+      });
+
+      Object.defineProperty(this.textbox, "selectedButton", {
+        get() {
+          return this.popup.oneOffButtons.selectedButton;
+        },
+        set(val) {
+          this.popup.oneOffButtons.selectedButton = val;
+        },
+      });
+
+      // This is implemented so that when textbox.value is set directly (e.g.,
+      // by tests), the one-off query is updated.
+      this.textbox.onBeforeValueSet = aValue => {
+        if (this.textbox.popup._oneOffButtons) {
+          this.textbox.popup.oneOffButtons.query = aValue;
+        }
+        return aValue;
+      };
+
+      // Returns true if the event is handled by us, false otherwise.
+      this.textbox.onBeforeHandleKeyDown = aEvent => {
+        if (aEvent.getModifierState("Accel")) {
+          if (
+            aEvent.keyCode == KeyEvent.DOM_VK_DOWN ||
+            aEvent.keyCode == KeyEvent.DOM_VK_UP
+          ) {
+            this.selectEngine(aEvent, aEvent.keyCode == KeyEvent.DOM_VK_DOWN);
+            return true;
+          }
+          return false;
+        }
+
+        if (
+          (AppConstants.platform == "macosx" &&
+            aEvent.keyCode == KeyEvent.DOM_VK_F4) ||
+          (aEvent.getModifierState("Alt") &&
+            (aEvent.keyCode == KeyEvent.DOM_VK_DOWN ||
+              aEvent.keyCode == KeyEvent.DOM_VK_UP))
+        ) {
+          if (!this.textbox.openSearch()) {
+            aEvent.preventDefault();
+            aEvent.stopPropagation();
+            return true;
+          }
+        }
+
+        let popup = this.textbox.popup;
+        if (popup.popupOpen) {
+          let suggestionsHidden =
+            popup.richlistbox.getAttribute("collapsed") == "true";
+          let numItems = suggestionsHidden ? 0 : popup.matchCount;
+          return popup.oneOffButtons.handleKeyDown(aEvent, numItems, true);
+        } else if (aEvent.keyCode == KeyEvent.DOM_VK_ESCAPE) {
+          if (this.textbox.editor.canUndo) {
+            this.textbox.editor.undoAll();
+          } else {
+            this.textbox.select();
+          }
+          return true;
+        }
+        return false;
+      };
+
+      // This method overrides the autocomplete binding's openPopup (essentially
+      // duplicating the logic from the autocomplete popup binding's
+      // openAutocompletePopup method), modifying it so that the popup is aligned with
+      // the inner textbox, but sized to not extend beyond the search bar border.
+      this.textbox.openPopup = () => {
+        // Entering customization mode after the search bar had focus causes
+        // the popup to appear again, due to focus returning after the
+        // hamburger panel closes. Don't open in that spurious event.
+        if (document.documentElement.getAttribute("customizing") == "true") {
+          return;
+        }
+
+        let popup = this.textbox.popup;
+        if (!popup.mPopupOpen) {
+          // Initially the panel used for the searchbar (PopupSearchAutoComplete
+          // in browser.xhtml) is hidden to avoid impacting startup / new
+          // window performance. The base binding's openPopup would normally
+          // call the overriden openAutocompletePopup in
+          // browser-search-autocomplete-result-popup binding to unhide the popup,
+          // but since we're overriding openPopup we need to unhide the panel
+          // ourselves.
+          popup.hidden = false;
+
+          // Don't roll up on mouse click in the anchor for the search UI.
+          if (popup.id == "PopupSearchAutoComplete") {
+            popup.setAttribute("norolluponanchor", "true");
+          }
+
+          popup.mInput = this.textbox;
+          // clear any previous selection, see bugs 400671 and 488357
+          popup.selectedIndex = -1;
+
+          // Ensure the panel has a meaningful initial size and doesn't grow
+          // unconditionally.
+          let { width } = window.windowUtils.getBoundsWithoutFlushing(this);
+          if (popup.oneOffButtons) {
+            // We have a min-width rule on search-panel-one-offs to show at
+            // least 4 buttons, so take that into account here.
+            width = Math.max(width, popup.oneOffButtons.buttonWidth * 4);
+          }
+
+          popup.style.setProperty("--panel-width", width + "px");
+          popup._invalidate();
+          popup.openPopup(this, "after_start");
+        }
+      };
+
+      this.textbox.openSearch = () => {
+        if (!this.textbox.popupOpen) {
+          this.openSuggestionsPanel();
+          return false;
+        }
+        return true;
+      };
+
+      this.textbox.handleEnter = event => {
+        // Toggle the open state of the add-engine menu button if it's
+        // selected.  We're using handleEnter for this instead of listening
+        // for the command event because a command event isn't fired.
+        if (
+          this.textbox.selectedButton &&
+          this.textbox.selectedButton.getAttribute("anonid") ==
+            "addengine-menu-button"
+        ) {
+          this.textbox.selectedButton.open = !this.textbox.selectedButton.open;
+          return true;
+        }
+        // Otherwise, "call super": do what the autocomplete binding's
+        // handleEnter implementation does.
+        return this.textbox.mController.handleEnter(false, event || null);
+      };
+
+      // override |onTextEntered| in autocomplete.xml
+      this.textbox.onTextEntered = event => {
+        this.textbox.editor.clearUndoRedo();
+
+        let engine;
+        let oneOff = this.textbox.selectedButton;
+        if (oneOff) {
+          if (!oneOff.engine) {
+            oneOff.doCommand();
+            return;
+          }
+          engine = oneOff.engine;
+        }
+        if (this.textbox.popupSelectedIndex != -1) {
+          this.telemetrySelectedIndex = this.textbox.popupSelectedIndex;
+          this.textbox.popupSelectedIndex = -1;
+        }
+        this.handleSearchCommand(event, engine);
+      };
+
+      this.textbox.onbeforeinput = event => {
+        if (event.data && this._needBrowserFocusAtEnterKeyUp) {
+          // Ignore char key input while processing enter key.
+          event.preventDefault();
+        }
+      };
+
+      this.textbox.onkeyup = event => {
+        // Pressing Enter key while pressing Meta key, and next, even when
+        // releasing Enter key before releasing Meta key, the keyup event is not
+        // fired. Therefore, if Enter keydown is detecting, continue the post
+        // processing for Enter key when any keyup event is detected.
+        if (this._needBrowserFocusAtEnterKeyUp) {
+          this._needBrowserFocusAtEnterKeyUp = false;
+          gBrowser.selectedBrowser.focus();
+        }
+      };
+    }
+
+    _buildContextMenu() {
+      const raw = `
+        <menuitem data-l10n-id="text-action-undo" cmd="cmd_undo"/>
+        <menuitem data-l10n-id="text-action-redo" cmd="cmd_redo"/>
+        <menuseparator/>
+        <menuitem data-l10n-id="text-action-cut" cmd="cmd_cut"/>
+        <menuitem data-l10n-id="text-action-copy" cmd="cmd_copy"/>
+        <menuitem data-l10n-id="text-action-paste" cmd="cmd_paste"/>
+        <menuitem class="searchbar-paste-and-search"/>
+        <menuitem data-l10n-id="text-action-delete" cmd="cmd_delete"/>
+        <menuitem data-l10n-id="text-action-select-all" cmd="cmd_selectAll"/>
+        <menuseparator/>
+        <menuitem class="searchbar-clear-history"/>
+      `;
+
+      this._menupopup = this.querySelector(".textbox-contextmenu");
+
+      let frag = MozXULElement.parseXULToFragment(raw);
+
+      // Insert attributes that come from localized properties
+      this._pasteAndSearchMenuItem = frag.querySelector(
+        ".searchbar-paste-and-search"
+      );
+      this._pasteAndSearchMenuItem.setAttribute(
+        "label",
+        this._stringBundle.getString("cmd_pasteAndSearch")
+      );
+
+      let clearHistoryItem = frag.querySelector(".searchbar-clear-history");
+      clearHistoryItem.setAttribute(
+        "label",
+        this._stringBundle.getString("cmd_clearHistory")
+      );
+      clearHistoryItem.setAttribute(
+        "accesskey",
+        this._stringBundle.getString("cmd_clearHistory_accesskey")
+      );
+
+      this._menupopup.appendChild(frag);
+
+      this._menupopup.addEventListener("command", event => {
+        switch (event.originalTarget) {
+          case this._pasteAndSearchMenuItem:
+            this.select();
+            goDoCommand("cmd_paste");
+            this.handleSearchCommand(event);
+            break;
+          case clearHistoryItem:
+            let param = this.textbox.getAttribute("autocompletesearchparam");
+            lazy.FormHistory.update({ op: "remove", fieldname: param });
+            this.textbox.value = "";
+            break;
+          default:
+            let cmd = event.originalTarget.getAttribute("cmd");
+            if (cmd) {
+              let controller =
+                document.commandDispatcher.getControllerForCommand(cmd);
+              controller.doCommand(cmd);
+            }
+            break;
+        }
+      });
+    }
+  }
+
+  customElements.define("searchbar", MozSearchbar);
+}