Et on ne peut pas mettre l'adresse du bookmarklet dans les sites autorisés car Firefox la considère comme erronée.

/* untuk pemakaian di blog/website anda, yang di copy hanya css di bawah ini*/

    /* style untuk link popup */
    a.popup-link {
        padding:17px 0;
        text-align: center;
        margin:7% auto;
        position: relative;
        width: 300px;
        color: #fff;
        text-decoration: none;
        background-color: #FFBA00;
        border-radius: 3px;
        box-shadow: 0 5px 0px 0px #eea900;
        display: block;
    }
    a.popup-link:hover {
        background-color: #ff9900;
        box-shadow: 0 3px 0px 0px #eea900;
        -webkit-transition:all 1s;
        -moz-transition:all 1s;
        transition:all 1s;
    }
    /* end link popup*/

    /*style untuk popup */  
    #popup {
        visibility: hidden;
        opacity: 0;
        margin-top: -200px;
    }
    #popup:target {
        visibility:visible;
        opacity: 1;
        background-color: rgba(0,0,0,0.8);
        position: fixed;
        top:0;
        left:0;
        right:0;
        bottom:0;
        margin:0;
        z-index: 99999999999;
        -webkit-transition:all 1s;
        -moz-transition:all 1s;
        transition:all 1s;
    }

    @media (min-width: 768px){
        .popup-container {
            width:600px;
        }
    }
    @media (max-width: 767px){
        .popup-container {
            width:100%;
        }
    }
    .popup-container {
        position: relative;
        margin:7% auto;
        padding:30px 50px;
        background-color: #fafafa;
        color:#333;
        border-radius: 3px;
    }

    a.popup-close {
        position: absolute;
        top:3px;
        right:3px;
        background-color: #333;
        padding:7px 10px;
        font-size: 20px;
        text-decoration: none;
        line-height: 1;
        color:#fff;
    }

    /* style untuk isi popup */

    .popup-form {
        margin:10px auto;
    }
        .popup-form h2 {
            margin-bottom: 5px;
            font-size: 37px;
            text-transform: uppercase;
        }
        .popup-form .input-group {
            margin:10px auto;
        }
            .popup-form .input-group input {
                padding:17px;
                text-align: center;
                margin-bottom: 10px;
                border-radius:3px;
                font-size: 16px; 
                display: block;
                width: 100%;
            }
            .popup-form .input-group input:focus {
                outline-color:#FB8833; 
            }
            .popup-form .input-group input[type="email"] {
                border:0px;
                position: relative;
            }
            .popup-form .input-group input[type="submit"] {
                background-color: #FB8833;
                color: #fff;
                border: 0;
                cursor: pointer;
            }
            .popup-form .input-group input[type="submit"]:focus {
                box-shadow: inset 0 3px 7px 3px #ea7722;
            }

<a href="#popup" class="popup-link">Klik untuk memunculkan Popup</a>
<div class="popup-wrapper" id="popup">
    <div class="popup-container">
        <form action="<a href="http://www.syakirurohman.net/2015/01/tutorial-membuat-popup-tanpa-javascript-jquery#&quot">http://www.syakirurohman.net/2015/01/tutorial-membuat-popup-tanpa-javascript-jquery#&quot</a>; method="post" class="popup-form">
            <h2>Ikuti Update !!</h2>
            <p>Daripada hanya melihat demo untuk popup-nya saja, lebih baik masukkan juga email anda agar mendapatkan pemberitahuan saat ada update posting menarik lain seperti ini.<br/>
            <strong>Percayalah, saya hanya akan mengirim sesuatu yang bermanfaat untuk anda :)</strong></p>
            <div class="input-group">
                <p><input type="email" name="email" placeholder="Email Address"></p>
                <p> 
                <input type="hidden" name="action" value="subscribe"> 
                <input type="hidden" name="source" value="<a href="http://www.syakirurohman.net/2015/01/tutorial-membuat-popup-tanpa-javascript-jquery"&gt">http://www.syakirurohman.net/2015/01/tutorial-membuat-popup-tanpa-javascript-jquery"&gt</a>; 
                <input type="hidden" name="sub-type" value="widget"> 
                <input type="hidden" name="redirect_fragment" value="blog_subscription-2"> 
                <input type="hidden" id="_wpnonce" name="_wpnonce" value="aaf0b68fcd"> 
                <input type="submit" value="Submit" name="jetpack_subscriptions_widget">
                </p>
            </div>
            <a class="popup-close" href="#closed">X</a>
        </form>
    </div>
</div>