I forgot to turn off the music while I was at work, which resulted in 1500 identical scrobbles. So I wrote this.

lastfm cleaner

    var id = setInterval(function () {
        var val = jQuery(".metadata-display").text();
        val++;
        val--;
        console.log("Left: " + val);
        if (val <= 0) {
            clearInterval(id);
            return;
        }
        jQuery(".chartlist-delete-button").click();
        jQuery(".next a").click();

    }, 5000);