Insert jQuery in a page with the DevTools
(function() {
var jq = document.createElement('script');
jq.src = "https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js";
document.getElementsByTagName('head')[0].appendChild(jq);
window.setTimeout(function() {
jQuery.noConflict();
}, 5000);
})();