deduplicate_registerProtocolHandler.js

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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/. */

"use strict";

  const proto = Object.getPrototypeOf(navigator);

  const { registerProtocolHandler } = proto;

  const { localStorage } = window;

  proto.registerProtocolHandler = (scheme, url, title) => {

    // special case mailto, as we have historically used "mail" as its prefix in localStorage.

    const lsKey = `${scheme == "mailto" ? "mail" : scheme}ProtocolHandlerAlreadyOffered`;

    if (localStorage.getItem(lsKey)) {

      return;

    registerProtocolHandler.call(this, scheme, url, title);

    localStorage.setItem(lsKey, true);

};

  window.__webcompat = (window.__webcompat ?? new Set()).add(

    "registerProtocolHandler"

);