use1.7.user.js

(function(cdata){
    var s = document.createElement("script");
    s.type = "application/javascript;version=1.7";
    s.textContent = cdata.toString();
    var head = document.getElementsByTagName("head")[0];
    head.appendChild(s);
    head.removeChild(s);
})(<><![CDATA[

    // do somthing.

]]></>);