add: dump('this.source = ' + this._source + '\n'); 
context:   onImportSourcePageShow: function ()  {    document.documentElement.getButton("back").disabled = true;        // Figure out what source apps are are available to import from:    var group = document.getElementById("importSourceGroup");    for (var i = 0; i < group.childNodes.length; ++i) {      var suffix = group.childNodes[i].id;      if (suffix != "nothing") {        var contractID = kProfileMigratorContractIDPrefix + suffix;        var migrator = Components.classes[contractID].createInstance(kIMig);        if (!migrator.sourceExists)          group.childNodes[i].hidden = true;      }    }        var firstNonDisabled = null;    for (var i = 0; i < group.childNodes.length; ++i) {      if (!group.childNodes[i].disabled) {        firstNonDisabled = group.childNodes[i];        break;      }    }    group.selectedItem = this._source == "" ? firstNonDisabled : document.getElementById(this._source);  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/e438f81b9884c918de5620ab705665ebaeeb5d76/migration.js/buggy/mail/components/migration/content/migration.js