rem: updateCommand: function (command) 
add: updateCommand: function (command) 
context:   updateCommand: function (command)   {    if (this.isCommandEnabled(command.id))      command.removeAttribute("disabled");    else      command.setAttribute("disabled", "true");  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/39be0419a4a695ce67977c967201261ea171190a/downloads.js/clean/toolkit/mozapps/downloads/content/downloads.js