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: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8395/43455f9fc69a7b8e33dae13cc90fd333fc5448d2/downloads.js/buggy/toolkit/mozapps/downloads/content/downloads.js