getElement('http://www.tomskneft.ru/about/', '.editable-content', function(element) {
    console.log(element.innerHTML);
});

function getElement(url, selector, c) {
    request(new XMLHttpRequest());

    function request(xhr) {
        xhr.open('GET', 'https://crossorigin.me/' + url, true);
        xhr.send();
        xhr.onreadystatechange = function() {
            if(xhr.readyState == 4) {
                if(xhr.status == 200) {
                    html = document.createElement('div');
                    html.innerHTML = xhr.responseText;
                    c(html.querySelector(selector));
                }
            }
        }
    }
}