回答

get-scrollbar-size.js

commands.addUserCommand(
  ['sitesearch'],
  'Search in this site',
  function (args) {
    liberator.open(
      'http://www.google.com/search?q=' +
        encodeURIComponent(args.literalArg) +
        '+site%3A' +
        window.content.location.hostname,
      liberator.NEW_TAB
    );
  },
  {
    completer: function (context) completion.url(context, 'S'),
    literal: 0,
  },
  true
);

mappings.addUserMap(
  [modes.NORMAL],
  ['ss'],
  'Search in this site',
  function() commandline.open(':', 'sitesearch ', modes.EX)
);