Open one or more URLs in a new background tab

btopen.js

js << EOM
    commands.add(
      ["backgroundtabopen", "bt[open]", "btabnew"],
      "Open one or more URLs in a new background tab",
      function (args) {
        let index = tabs.getTab();
        let special = args.bang;
        args = args.string;
        if (options.get("activate").has("all", "tabopen"))
          special = !special;
        let where = special ? liberator.NEW_TAB : liberator.NEW_BACKGROUND_TAB;
        if (args)
          liberator.open(args, { where: where });
        else
          liberator.open("", { where: where });
        tabs.selectAlternateTab();
      }, {
        bang: true,
        completer: function (context) completion.url(context),
        literal: 0,
        privateData: true
      }
    );
EOM