A bookmarklet that allows you to easily bucket yourself into an Optimizely experiment and variation via the use of query parameters. More info can be found here: https://help.optimizely.com/hc/en-us/articles/200107480-Force-a-specific-variation-to-run-and-other-URL-parameters-

Optly Force URL

javascript:(function() {

     /**
      * @package     N/A
      * @version     1.0
      * @author      Blue Acorn <code@blueacorn.com>, Sean Emmel <sean.emmel@blueacorn.com>
      * @copyright   Copyright © 2015 Blue Acorn.
      */

    (function() {
        var exp;
        var v;
        var url = window.location.href;

        if ( !sessionStorage.exp ) {
            exp = prompt("Experiment ID?");

            if (exp === null || exp === false || exp === undefined) {
                return false; 
            } else {
                exp = Number(exp);
                sessionStorage.exp = exp;
            }
        }

        v = prompt("Variation?");

        if (v === null || v === false || v === undefined) {
            return false; 
        } else {
            v = Number(v);
        }

        if (url.indexOf('?optimizely_x') != -1) {
            window.location.href = url.split('?optimizely_x')[0] + "?optimizely_x" + sessionStorage.exp + "=" + v; /* replace old Optimizely params with new ones */
        } else if (url.indexOf('&optimizely_x') != -1) {
            window.location.href = url.split('&optimizely_x')[0] + "&optimizely_x" + sessionStorage.exp + "=" + v; /* replace old Optimizely params with new ones */
        } else if ( url.indexOf('?optimizely_x') === -1 || url.indexOf('&optimizely_x') === -1 ) {
            if (url.indexOf('?') != -1) {
                if (url.split('?')[1].length > 0) {
                    window.location.href = url + "&optimizely_x" + sessionStorage.exp + "=" + v; /* other query params present, so append as an & param */
                }
                else {
                    window.location.href = url + "optimizely_x" + sessionStorage.exp + "=" + v; /* ? present but no params; append params to url */
                }
            } else {
                window.location.href = url + "?optimizely_x" + sessionStorage.exp + "=" + v; /* no query params; append new Optimizely params to url */ 
            } 
        }
    })();

}());