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diff --git a/toolkit/modules/CreditCard.sys.mjs b/toolkit/modules/CreditCard.sys.mjs
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+/* 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/. */
+
+// The list of known and supported credit card network ids ("types")
+// This list mirrors the networks from dom/payments/BasicCardPayment.cpp
+// and is defined by https://www.w3.org/Payments/card-network-ids
+const SUPPORTED_NETWORKS = Object.freeze([
+  "amex",
+  "cartebancaire",
+  "diners",
+  "discover",
+  "jcb",
+  "mastercard",
+  "mir",
+  "unionpay",
+  "visa",
+]);
+
+// This lists stores lower cased variations of popular credit card network
+// names for matching against strings.
+export const NETWORK_NAMES = {
+  "american express": "amex",
+  "master card": "mastercard",
+  "union pay": "unionpay",
+};
+
+// Based on https://en.wikipedia.org/wiki/Payment_card_number
+//
+// Notice:
+//   - CarteBancaire (`4035`, `4360`) is now recognized as Visa.
+//   - UnionPay (`63--`) is now recognized as Discover.
+// This means that the order matters.
+// First we'll try to match more specific card,
+// and if that doesn't match we'll test against the more generic range.
+const CREDIT_CARD_IIN = [
+  { type: "amex", start: 34, end: 34, len: 15 },
+  { type: "amex", start: 37, end: 37, len: 15 },
+  { type: "cartebancaire", start: 4035, end: 4035, len: 16 },
+  { type: "cartebancaire", start: 4360, end: 4360, len: 16 },
+  // We diverge from Wikipedia here, because Diners card
+  // support length of 14-19.
+  { type: "diners", start: 300, end: 305, len: [14, 19] },
+  { type: "diners", start: 3095, end: 3095, len: [14, 19] },
+  { type: "diners", start: 36, end: 36, len: [14, 19] },
+  { type: "diners", start: 38, end: 39, len: [14, 19] },
+  { type: "discover", start: 6011, end: 6011, len: [16, 19] },
+  { type: "discover", start: 622126, end: 622925, len: [16, 19] },
+  { type: "discover", start: 624000, end: 626999, len: [16, 19] },
+  { type: "discover", start: 628200, end: 628899, len: [16, 19] },
+  { type: "discover", start: 64, end: 65, len: [16, 19] },
+  { type: "jcb", start: 3528, end: 3589, len: [16, 19] },
+  { type: "mastercard", start: 2221, end: 2720, len: 16 },
+  { type: "mastercard", start: 51, end: 55, len: 16 },
+  { type: "mir", start: 2200, end: 2204, len: 16 },
+  { type: "unionpay", start: 62, end: 62, len: [16, 19] },
+  { type: "unionpay", start: 81, end: 81, len: [16, 19] },
+  { type: "visa", start: 4, end: 4, len: 16 },
+].sort((a, b) => b.start - a.start);
+
+export class CreditCard {
+  /**
+   * A CreditCard object represents a credit card, with
+   * number, name, expiration, network, and CCV.
+   * The number is the only required information when creating
+   * an object, all other members are optional. The number
+   * is validated during construction and will throw if invalid.
+   *
+   * @param {string} name, optional
+   * @param {string} number
+   * @param {string} expirationString, optional
+   * @param {string|number} expirationMonth, optional
+   * @param {string|number} expirationYear, optional
+   * @param {string} network, optional
+   * @param {string|number} ccv, optional
+   * @param {string} encryptedNumber, optional
+   * @throws if number is an invalid credit card number
+   */
+  constructor({
+    name,
+    number,
+    expirationString,
+    expirationMonth,
+    expirationYear,
+    network,
+    ccv,
+    encryptedNumber,
+  }) {
+    this._name = name;
+    this._unmodifiedNumber = number;
+    this._encryptedNumber = encryptedNumber;
+    this._ccv = ccv;
+    this.number = number;
+    let { month, year } = CreditCard.normalizeExpiration({
+      expirationString,
+      expirationMonth,
+      expirationYear,
+    });
+    this._expirationMonth = month;
+    this._expirationYear = year;
+    this.network = network;
+  }
+
+  set name(value) {
+    this._name = value;
+  }
+
+  set expirationMonth(value) {
+    if (typeof value == "undefined") {
+      this._expirationMonth = undefined;
+      return;
+    }
+    this._expirationMonth = CreditCard.normalizeExpirationMonth(value);
+  }
+
+  get expirationMonth() {
+    return this._expirationMonth;
+  }
+
+  set expirationYear(value) {
+    if (typeof value == "undefined") {
+      this._expirationYear = undefined;
+      return;
+    }
+    this._expirationYear = CreditCard.normalizeExpirationYear(value);
+  }
+
+  get expirationYear() {
+    return this._expirationYear;
+  }
+
+  set expirationString(value) {
+    let { month, year } = CreditCard.parseExpirationString(value);
+    this.expirationMonth = month;
+    this.expirationYear = year;
+  }
+
+  set ccv(value) {
+    this._ccv = value;
+  }
+
+  get number() {
+    return this._number;
+  }
+
+  /**
+   * Sets the number member of a CreditCard object. If the number
+   * is not valid according to the Luhn algorithm then the member
+   * will get set to the empty string before throwing an exception.
+   *
+   * @param {string} value
+   * @throws if the value is an invalid credit card number
+   */
+  set number(value) {
+    if (value) {
+      let normalizedNumber = CreditCard.normalizeCardNumber(value);
+      // Based on the information on wiki[1], the shortest valid length should be
+      // 12 digits (Maestro).
+      // [1] https://en.wikipedia.org/wiki/Payment_card_number
+      normalizedNumber = normalizedNumber.match(/^\d{12,}$/)
+        ? normalizedNumber
+        : "";
+      this._number = normalizedNumber;
+    } else {
+      this._number = "";
+    }
+
+    if (value && !this.isValidNumber()) {
+      this._number = "";
+      throw new Error("Invalid credit card number");
+    }
+  }
+
+  get network() {
+    return this._network;
+  }
+
+  set network(value) {
+    this._network = value || undefined;
+  }
+
+  // Implements the Luhn checksum algorithm as described at
+  // http://wikipedia.org/wiki/Luhn_algorithm
+  // Number digit lengths vary with network, but should fall within 12-19 range. [2]
+  // More details at https://en.wikipedia.org/wiki/Payment_card_number
+  isValidNumber() {
+    if (!this._number) {
+      return false;
+    }
+
+    // Remove dashes and whitespace
+    let number = this._number.replace(/[\-\s]/g, "");
+
+    let len = number.length;
+    if (len < 12 || len > 19) {
+      return false;
+    }
+
+    if (!/^\d+$/.test(number)) {
+      return false;
+    }
+
+    let total = 0;
+    for (let i = 0; i < len; i++) {
+      let ch = parseInt(number[len - i - 1], 10);
+      if (i % 2 == 1) {
+        // Double it, add digits together if > 10
+        ch *= 2;
+        if (ch > 9) {
+          ch -= 9;
+        }
+      }
+      total += ch;
+    }
+    return total % 10 == 0;
+  }
+
+  /**
+   * Normalizes a credit card number.
+   * @param {string} number
+   * @return {string | null}
+   * @memberof CreditCard
+   */
+  static normalizeCardNumber(number) {
+    if (!number) {
+      return null;
+    }
+    return number.replace(/[\-\s]/g, "");
+  }
+
+  /**
+   * Attempts to match the number against known network identifiers.
+   *
+   * @param {string} ccNumber Credit card number with no spaces or special characters in it.
+   *
+   * @returns {string|null}
+   */
+  static getType(ccNumber) {
+    if (!ccNumber) {
+      return null;
+    }
+
+    for (let i = 0; i < CREDIT_CARD_IIN.length; i++) {
+      const range = CREDIT_CARD_IIN[i];
+      if (typeof range.len == "number") {
+        if (range.len != ccNumber.length) {
+          continue;
+        }
+      } else if (
+        ccNumber.length < range.len[0] ||
+        ccNumber.length > range.len[1]
+      ) {
+        continue;
+      }
+
+      const prefixLength = Math.floor(Math.log10(range.start)) + 1;
+      const prefix = parseInt(ccNumber.substring(0, prefixLength), 10);
+      if (prefix >= range.start && prefix <= range.end) {
+        return range.type;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Attempts to retrieve a card network identifier based
+   * on a name.
+   *
+   * @param {string|undefined|null} name
+   *
+   * @returns {string|null}
+   */
+  static getNetworkFromName(name) {
+    if (!name) {
+      return null;
+    }
+    let lcName = name.trim().toLowerCase().normalize("NFKC");
+    if (SUPPORTED_NETWORKS.includes(lcName)) {
+      return lcName;
+    }
+    for (let term in NETWORK_NAMES) {
+      if (lcName.includes(term)) {
+        return NETWORK_NAMES[term];
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Returns true if the card number is valid and the
+   * expiration date has not passed. Otherwise false.
+   *
+   * @returns {boolean}
+   */
+  isValid() {
+    if (!this.isValidNumber()) {
+      return false;
+    }
+
+    let currentDate = new Date();
+    let currentYear = currentDate.getFullYear();
+    if (this._expirationYear > currentYear) {
+      return true;
+    }
+
+    // getMonth is 0-based, so add 1 because credit cards are 1-based
+    let currentMonth = currentDate.getMonth() + 1;
+    return (
+      this._expirationYear == currentYear &&
+      this._expirationMonth >= currentMonth
+    );
+  }
+
+  get maskedNumber() {
+    return CreditCard.getMaskedNumber(this._number);
+  }
+
+  get longMaskedNumber() {
+    return CreditCard.getLongMaskedNumber(this._number);
+  }
+
+  /**
+   * Get credit card display label. It should display masked numbers, the
+   * cardholder's name, and the expiration date, separated by a commas.
+   * In addition, the card type is provided in the accessibility label.
+   */
+  static getLabelInfo({ number, name, month, year, type }) {
+    let formatSelector = ["number"];
+    if (name) {
+      formatSelector.push("name");
+    }
+    if (month && year) {
+      formatSelector.push("expiration");
+    }
+    let stringId = `credit-card-label-${formatSelector.join("-")}-2`;
+    return {
+      id: stringId,
+      args: {
+        number: CreditCard.getMaskedNumber(number),
+        name,
+        month: month?.toString(),
+        year: year?.toString(),
+        type,
+      },
+    };
+  }
+
+  /**
+   *
+   * Please use getLabelInfo above, as it allows for localization.
+   * @deprecated
+   */
+  static getLabel({ number, name }) {
+    let parts = [];
+
+    if (number) {
+      parts.push(CreditCard.getMaskedNumber(number));
+    }
+    if (name) {
+      parts.push(name);
+    }
+    return parts.join(", ");
+  }
+
+  static normalizeExpirationMonth(month) {
+    month = parseInt(month, 10);
+    if (isNaN(month) || month < 1 || month > 12) {
+      return undefined;
+    }
+    return month;
+  }
+
+  static normalizeExpirationYear(year) {
+    year = parseInt(year, 10);
+    if (isNaN(year) || year < 0) {
+      return undefined;
+    }
+    if (year < 100) {
+      year += 2000;
+    }
+    return year;
+  }
+
+  static parseExpirationString(expirationString) {
+    let rules = [
+      {
+        regex: /(?:^|\D)(\d{2})(\d{2})(?!\d)/,
+      },
+      {
+        regex: /(?:^|\D)(\d{4})[-/](\d{1,2})(?!\d)/,
+        yearIndex: 0,
+        monthIndex: 1,
+      },
+      {
+        regex: /(?:^|\D)(\d{1,2})[-/](\d{4})(?!\d)/,
+        yearIndex: 1,
+        monthIndex: 0,
+      },
+      {
+        regex: /(?:^|\D)(\d{1,2})[-/](\d{1,2})(?!\d)/,
+      },
+      {
+        regex: /(?:^|\D)(\d{2})(\d{2})(?!\d)/,
+      },
+    ];
+
+    expirationString = expirationString.replaceAll(" ", "");
+    for (let rule of rules) {
+      let result = rule.regex.exec(expirationString);
+      if (!result) {
+        continue;
+      }
+
+      let year, month;
+      const parsedResults = [parseInt(result[1], 10), parseInt(result[2], 10)];
+      if (!rule.yearIndex || !rule.monthIndex) {
+        month = parsedResults[0];
+        if (month > 12) {
+          year = parsedResults[0];
+          month = parsedResults[1];
+        } else {
+          year = parsedResults[1];
+        }
+      } else {
+        year = parsedResults[rule.yearIndex];
+        month = parsedResults[rule.monthIndex];
+      }
+
+      if (month >= 1 && month <= 12 && (year < 100 || year > 2000)) {
+        return { month, year };
+      }
+    }
+    return { month: undefined, year: undefined };
+  }
+
+  static normalizeExpiration({
+    expirationString,
+    expirationMonth,
+    expirationYear,
+  }) {
+    // Only prefer the string version if missing one or both parsed formats.
+    let parsedExpiration = {};
+    if (expirationString && (!expirationMonth || !expirationYear)) {
+      parsedExpiration = CreditCard.parseExpirationString(expirationString);
+    }
+    return {
+      month: CreditCard.normalizeExpirationMonth(
+        parsedExpiration.month || expirationMonth
+      ),
+      year: CreditCard.normalizeExpirationYear(
+        parsedExpiration.year || expirationYear
+      ),
+    };
+  }
+
+  static formatMaskedNumber(maskedNumber) {
+    return {
+      affix: "****",
+      label: maskedNumber.replace(/^\**/, ""),
+    };
+  }
+
+  static getCreditCardLogo(network) {
+    const PATH = "chrome://formautofill/content/";
+    const THIRD_PARTY_PATH = PATH + "third-party/";
+    switch (network) {
+      case "amex":
+        return THIRD_PARTY_PATH + "cc-logo-amex.png";
+      case "cartebancaire":
+        return THIRD_PARTY_PATH + "cc-logo-cartebancaire.png";
+      case "diners":
+        return THIRD_PARTY_PATH + "cc-logo-diners.svg";
+      case "discover":
+        return THIRD_PARTY_PATH + "cc-logo-discover.png";
+      case "jcb":
+        return THIRD_PARTY_PATH + "cc-logo-jcb.svg";
+      case "mastercard":
+        return THIRD_PARTY_PATH + "cc-logo-mastercard.svg";
+      case "mir":
+        return THIRD_PARTY_PATH + "cc-logo-mir.svg";
+      case "unionpay":
+        return THIRD_PARTY_PATH + "cc-logo-unionpay.svg";
+      case "visa":
+        return THIRD_PARTY_PATH + "cc-logo-visa.svg";
+      default:
+        return PATH + "icon-credit-card-generic.svg";
+    }
+  }
+
+  static getMaskedNumber(number) {
+    return "*".repeat(4) + " " + number.substr(-4);
+  }
+
+  static getLongMaskedNumber(number) {
+    return "*".repeat(number.length - 4) + number.substr(-4);
+  }
+
+  /*
+   * Validates the number according to the Luhn algorithm. This
+   * method does not throw an exception if the number is invalid.
+   */
+  static isValidNumber(number) {
+    try {
+      new CreditCard({ number });
+    } catch (ex) {
+      return false;
+    }
+    return true;
+  }
+
+  static isValidNetwork(network) {
+    return SUPPORTED_NETWORKS.includes(network);
+  }
+
+  static getSupportedNetworks() {
+    return SUPPORTED_NETWORKS;
+  }
+
+  /**
+   * Localised names for supported networks are available in
+   * `browser/preferences/formAutofill.ftl`.
+   */
+  static getNetworkL10nId(network) {
+    return this.isValidNetwork(network)
+      ? `autofill-card-network-${network}`
+      : null;
+  }
+}