autoplay

new WebKitMutationObserver(function(mutations) {
    mutations.forEach(function(mutation) {
        if (!mutation.addedNodes) return;
        [].map.call(mutation.addedNodes, function xPlay(el) {
            if (el.nodeType != 1) return;
            var play = geByClass1('audio-msg-track--btn', el);
            if(!play || play.played) return;
            play.played = 1;
            play.click();
            console.log('play', play, el);
        });
    });
}).observe(document.body, {
    childList: true,
    subtree: true
});