MediaWiki:Common.css

/* CSS placed here will be applied to all skins */
#ca-talk,
#ca-viewsource,
#footer-info,
#footer-places
#footer-info-lastmod,
#footer-info-copyright,
#footer-places-privacy,
#footer-places-disclaimer,
#pt-anonuserpage,
#pt-anontalk
{ 
  display:none!important; 
}