User:Jj137/monobook.js

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function tabs()
{
  // Only add for pages with the right string somewhere in the title
  if (document.title.indexOf("") != -1)
    {
      mw.util.addPortletLink('p-cactions', 'http://en.wikipedia.org/wiki/Main_Page', "en.wiki");
      mw.util.addPortletLink('p-cactions', 'http://meta.wikimedia.org/wiki/User:Jj137/Matrix', "matrix");
    }
}

$(tabs);