inject script to html

inject.bookmark.js

javascript:!function(d,script){script=d.createElement("script"),script.type="text/javascript",script.async=!0,script.onload=function(){return TogetherJS(this),!1},script.src="https://togetherjs.com/togetherjs-min.js",d.getElementsByTagName("head")[0].appendChild(script)}(document);

inject.button.js

(function(d, script, button) {
    script = d.createElement('script');
    script.type = 'text/javascript';
    script.async = true;
    script.onload = function(){
        // remote script has loaded
        button = d.createElement('button');
        button.addEventListener( 'click', function(){
            TogetherJS(this); return false;
        }, false);

        d.getElementsByTagName('body')[0].appendChild(button);
        button.innerHTML += 'TogetherJS';
    };
    script.src = 'https://togetherjs.com/togetherjs-min.js';
    d.getElementsByTagName('head')[0].appendChild(script);
}(document));

inject.js

(function(d, script) {
    script = d.createElement('script');
    script.type = 'text/javascript';
    script.async = true;
    script.onload = function(){
        // remote script has loaded
        TogetherJS(this); return false;
    };
    script.src = 'https://togetherjs.com/togetherjs-min.js';
    d.getElementsByTagName('head')[0].appendChild(script);
}(document));