Inject jQuery to any website with this one simple trick!

inject_jquery.js

//Paste this on the console.
//Your jQ code should go in function 'jqExec'
//You can override the version by changing the 'version' parameter.

(function(version) {
    if (typeof version == "undefined") { version = "2.1.1"; }
    var script = document.createElement("script");
    script.src = "https://code.jquery.com/jquery-" + version + ".min.js";
    script.type = "text/javascript";
    document.getElementsByTagName("head")[0].appendChild(script);
    var interval = setInterval(function() {
        if (typeof jQuery === "function") {
            clearInterval(interval);
            jqExec(jQuery);
        }
    }, 500);
     
    function jqExec($) {
      alert($.fn.jquery);
    }
})("1.9.0");