Craigslist annualized rent hack (run in console)

gistfile1.js

[].slice.call(document.querySelectorAll('p.row')).forEach(
    function(L) {
        var y = '$'+ +/\$(\d+)/.exec(L.innerText)[1]*12+' - ',
            yL = document.createElement('span');
        yL.innerText = y;
        L.insertBefore(yL, L.firstChild);
    });