add: case "button_edit": 
context:   supportsCommand: function(command)  {    switch (command) {      case "cmd_selectAll":      case "cmd_delete":      case "button_delete":        return true;      default:        return false;    }  },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/ff2c2136c31c015a89715fc5903b1d65c8a261fb/abCommon.js/clean/mailnews/addrbook/resources/content/abCommon.js