rem: this.dialogElement( "chooseApp" ).disabled = this.dialogElement( "appPath" ).disabled = !this.dialogElement( "openUsing" ).selected; 
add: var openUsing = this.dialogElement( "openUsing" ).selected; this.dialogElement( "chooseApp" ).disabled = !openUsing;  this.dialogElement( "appPath" ).disabled = !openUsing || this.mIsMac; 
context:     toggleChoice : function () {        // See what option is selected.        this.dialogElement( "chooseApp" ).disabled =             this.dialogElement( "appPath" ).disabled = !this.dialogElement( "openUsing" ).selected;        this.updateOKButton();    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/3ac6754e68dff3a3bf3b50e156c50fa09342fb35/nsHelperAppDlg.js/buggy/embedding/components/ui/helperAppDlg/nsHelperAppDlg.js