TB 42583: Modify moz-support-link for Tor Browser.

  #setHref() {

    let torManualPage = this.getAttribute("tor-manual-page");

    if (torManualPage) {

      const [page, anchor] = torManualPage.split("_", 2);

      let locale = Services.locale.appLocaleAsBCP47;

      if (locale === "ja-JP-macos") {

        // Convert quirk-locale to the locale used for tor project.

        locale = "ja";

      }

      let href = `https://tb-manual.torproject.org/${locale}/${page}/`;

      if (anchor) {

        href = `${href}#${anchor}`;

      }

      this.href = href;

      this.href = `about:manual#${torManualPage}`;

      return;

    }

    let supportPage = this.getAttribute("support-page") ?? "";