rem: return commandNode && commandNode.parentNode == document.getElementById("downloadsCommands"); 
add: return commandNode && commandNode.parentNode == document.getElementById("downloadsCommands"); 
context:   supportsCommand: function (aCommand)  {    var commandNode = document.getElementById(aCommand);    return commandNode && commandNode.parentNode == document.getElementById("downloadsCommands");  },
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/c816c402c2dc9a4ba3e0172325a9186da0704138/downloads.js/buggy/toolkit/mozapps/downloads/content/downloads.js