// Click on Leave Group
function triggerMouseEvent(node, eventType) {
var clickEvent = document.createEvent('MouseEvents');
clickEvent.initEvent(eventType, true, true);
node.dispatchEvent(clickEvent);
}
// Loop through the array searching for the leave group link
var arrayLength = $J('.linkStandard').length ;
for (var i = 0; i < arrayLength; i++) {
if( $J('.linkStandard')[i].href.indexOf( "leaveGroupPrompt" ) > 0 ) {
triggerMouseEvent( $J('.linkStandard')[i], 'click');
}
};
Source: http://www.steamgifts.com/go/comment/VBcGA7Y