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diff --git a/browser/components/urlbar/UrlbarProviderPreloadedSites.sys.mjs b/browser/components/urlbar/UrlbarProviderPreloadedSites.sys.mjs
new file mode 100644
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+++ b/browser/components/urlbar/UrlbarProviderPreloadedSites.sys.mjs
@@ -0,0 +1,297 @@
+/* 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/. */
+
+/**
+ * This module exports a provider that provides preloaded site results. These
+ * are intended to populate address bar results when the user has no history.
+ * They can be both autofilled and provided as regular results.
+ */
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+import {
+  UrlbarProvider,
+  UrlbarUtils,
+} from "resource:///modules/UrlbarUtils.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  ProfileAge: "resource://gre/modules/ProfileAge.sys.mjs",
+  UrlbarPrefs: "resource:///modules/UrlbarPrefs.sys.mjs",
+  UrlbarResult: "resource:///modules/UrlbarResult.sys.mjs",
+  UrlbarTokenizer: "resource:///modules/UrlbarTokenizer.sys.mjs",
+});
+
+const MS_PER_DAY = 86400000; // 24 * 60 * 60 * 1000
+
+function PreloadedSite(url, title) {
+  this.uri = Services.io.newURI(url);
+  this.title = title;
+  this._matchTitle = title.toLowerCase();
+  this._hasWWW = this.uri.host.startsWith("www.");
+  this._hostWithoutWWW = this._hasWWW ? this.uri.host.slice(4) : this.uri.host;
+}
+
+/**
+ * Storage object for Preloaded Sites.
+ *   add(url, title): adds a site to storage
+ *   populate(sites) : populates the  storage with array of [url,title]
+ *   sites[]: resulting array of sites (PreloadedSite objects)
+ */
+XPCOMUtils.defineLazyGetter(lazy, "PreloadedSiteStorage", () =>
+  Object.seal({
+    sites: [],
+
+    add(url, title) {
+      let site = new PreloadedSite(url, title);
+      this.sites.push(site);
+    },
+
+    populate(sites) {
+      this.sites = [];
+      for (let site of sites) {
+        this.add(site[0], site[1]);
+      }
+    },
+  })
+);
+
+XPCOMUtils.defineLazyGetter(lazy, "ProfileAgeCreatedPromise", async () => {
+  let times = await lazy.ProfileAge();
+  return times.created;
+});
+
+/**
+ * Class used to create the provider.
+ */
+class ProviderPreloadedSites extends UrlbarProvider {
+  constructor() {
+    super();
+
+    if (lazy.UrlbarPrefs.get("usepreloadedtopurls.enabled")) {
+      fetch("chrome://browser/content/urlbar/preloaded-top-urls.json")
+        .then(response => response.json())
+        .then(sites => lazy.PreloadedSiteStorage.populate(sites))
+        .catch(ex => this.logger.error(ex));
+    }
+  }
+
+  /**
+   * Returns the name of this provider.
+   *
+   * @returns {string} the name of this provider.
+   */
+  get name() {
+    return "PreloadedSites";
+  }
+
+  /**
+   * Returns the type of this provider.
+   *
+   * @returns {integer} one of the types from UrlbarUtils.PROVIDER_TYPE.*
+   */
+  get type() {
+    return UrlbarUtils.PROVIDER_TYPE.HEURISTIC;
+  }
+
+  /**
+   * Whether this provider should be invoked for the given context.
+   * If this method returns false, the providers manager won't start a query
+   * with this provider, to save on resources.
+   *
+   * @param {UrlbarQueryContext} queryContext The query context object
+   * @returns {boolean} Whether this provider should be invoked for the search.
+   */
+  async isActive(queryContext) {
+    let instance = this.queryInstance;
+
+    // This is usually reset on canceling or completing the query, but since we
+    // query in isActive, it may not have been canceled by the previous call.
+    // It is an object with values { result: UrlbarResult, instance: Query }.
+    // See the documentation for _getAutofillData for more information.
+    this._autofillData = null;
+
+    await this._checkPreloadedSitesExpiry();
+    if (instance != this.queryInstance) {
+      return false;
+    }
+
+    if (!lazy.UrlbarPrefs.get("usepreloadedtopurls.enabled")) {
+      return false;
+    }
+
+    if (
+      !lazy.UrlbarPrefs.get("autoFill") ||
+      !queryContext.allowAutofill ||
+      queryContext.tokens.length != 1
+    ) {
+      return false;
+    }
+
+    // Trying to autofill an extremely long string would be expensive, and
+    // not particularly useful since the filled part falls out of screen anyway.
+    if (queryContext.searchString.length > UrlbarUtils.MAX_TEXT_LENGTH) {
+      return false;
+    }
+
+    [this._strippedPrefix, this._searchString] = UrlbarUtils.stripURLPrefix(
+      queryContext.searchString
+    );
+    if (!this._searchString || !this._searchString.length) {
+      return false;
+    }
+    this._lowerCaseSearchString = this._searchString.toLowerCase();
+    this._strippedPrefix = this._strippedPrefix.toLowerCase();
+
+    // As an optimization, don't try to autofill if the search term includes any
+    // whitespace.
+    if (lazy.UrlbarTokenizer.REGEXP_SPACES.test(queryContext.searchString)) {
+      return false;
+    }
+
+    // Fetch autofill result now, rather than in startQuery. We do this so the
+    // muxer doesn't have to wait on autofill for every query, since startQuery
+    // will be guaranteed to return a result very quickly using this approach.
+    // Bug 1651101 is filed to improve this behaviour.
+    let result = await this._getAutofillResult(queryContext);
+    if (instance != this.queryInstance) {
+      return false;
+    }
+    this._autofillData = { result, instance };
+    return true;
+  }
+
+  /**
+   * Starts querying.
+   *
+   * @param {object} queryContext The query context object
+   * @param {Function} addCallback Callback invoked by the provider to add a new
+   *        result.
+   * @returns {Promise} resolved when the query stops.
+   */
+  async startQuery(queryContext, addCallback) {
+    // Check if the query was cancelled while the autofill result was being
+    // fetched. We don't expect this to be true since we also check the instance
+    // in isActive and clear _autofillData in cancelQuery, but we sanity check it.
+    if (
+      this._autofillData.result &&
+      this._autofillData.instance == this.queryInstance
+    ) {
+      this._autofillData.result.heuristic = true;
+      addCallback(this, this._autofillData.result);
+      this._autofillData = null;
+    }
+
+    // Now, add non-autofill preloaded sites.
+    for (let site of lazy.PreloadedSiteStorage.sites) {
+      let url = site.uri.spec;
+      if (
+        (!this._strippedPrefix || url.startsWith(this._strippedPrefix)) &&
+        (site.uri.host.includes(this._lowerCaseSearchString) ||
+          site._matchTitle.includes(this._lowerCaseSearchString))
+      ) {
+        let result = new lazy.UrlbarResult(
+          UrlbarUtils.RESULT_TYPE.URL,
+          UrlbarUtils.RESULT_SOURCE.OTHER_LOCAL,
+          ...lazy.UrlbarResult.payloadAndSimpleHighlights(queryContext.tokens, {
+            title: [site.title, UrlbarUtils.HIGHLIGHT.TYPED],
+            url: [url, UrlbarUtils.HIGHLIGHT.TYPED],
+            icon: UrlbarUtils.getIconForUrl(url),
+          })
+        );
+        addCallback(this, result);
+      }
+    }
+  }
+
+  /**
+   * Cancels a running query.
+   *
+   * @param {object} queryContext The query context object
+   */
+  cancelQuery(queryContext) {
+    if (this._autofillData?.instance == this.queryInstance) {
+      this._autofillData = null;
+    }
+  }
+
+  /**
+   * Populates the preloaded site cache with a list of sites. Intended for tests
+   * only.
+   *
+   * @param {Array} list
+   *   An array of URLs mapped to titles. See preloaded-top-urls.json for
+   *   the format.
+   */
+  populatePreloadedSiteStorage(list) {
+    lazy.PreloadedSiteStorage.populate(list);
+  }
+
+  async _getAutofillResult(queryContext) {
+    let matchedSite = lazy.PreloadedSiteStorage.sites.find(site => {
+      return (
+        (!this._strippedPrefix ||
+          site.uri.spec.startsWith(this._strippedPrefix)) &&
+        (site.uri.host.startsWith(this._lowerCaseSearchString) ||
+          site.uri.host.startsWith("www." + this._lowerCaseSearchString))
+      );
+    });
+    if (!matchedSite) {
+      return null;
+    }
+
+    let url = matchedSite.uri.spec;
+
+    let [title] = UrlbarUtils.stripPrefixAndTrim(url, {
+      stripHttp: true,
+      trimEmptyQuery: true,
+      trimSlash: !this._searchString.includes("/"),
+    });
+
+    let result = new lazy.UrlbarResult(
+      UrlbarUtils.RESULT_TYPE.URL,
+      UrlbarUtils.RESULT_SOURCE.OTHER_LOCAL,
+      ...lazy.UrlbarResult.payloadAndSimpleHighlights(queryContext.tokens, {
+        title: [title, UrlbarUtils.HIGHLIGHT.TYPED],
+        url: [url, UrlbarUtils.HIGHLIGHT.TYPED],
+        icon: UrlbarUtils.getIconForUrl(url),
+      })
+    );
+
+    let value = UrlbarUtils.stripURLPrefix(url)[1];
+    value =
+      this._strippedPrefix + value.substr(value.indexOf(this._searchString));
+    let autofilledValue =
+      queryContext.searchString +
+      value.substring(queryContext.searchString.length);
+    result.autofill = {
+      type: "preloaded",
+      value: autofilledValue,
+      selectionStart: queryContext.searchString.length,
+      selectionEnd: autofilledValue.length,
+    };
+    return result;
+  }
+
+  async _checkPreloadedSitesExpiry() {
+    if (!lazy.UrlbarPrefs.get("usepreloadedtopurls.enabled")) {
+      return;
+    }
+    let profileCreationDate = await lazy.ProfileAgeCreatedPromise;
+    let daysSinceProfileCreation =
+      (Date.now() - profileCreationDate) / MS_PER_DAY;
+    if (
+      daysSinceProfileCreation >
+      lazy.UrlbarPrefs.get("usepreloadedtopurls.expire_days")
+    ) {
+      Services.prefs.setBoolPref(
+        "browser.urlbar.usepreloadedtopurls.enabled",
+        false
+      );
+    }
+  }
+}
+
+export var UrlbarProviderPreloadedSites = new ProviderPreloadedSites();