Bookmarklet to scrub and speak current URL via SpeechSynthesisUtterance. (Please use your own Readability API token). Added chunking.

speaker.js

javascript:(function(e,a,g,h,f,c,b,d){if(!(f=e.jQuery)||g>f.fn.jquery||h(f)){c=a.createElement("script");c.type="text/javascript";c.src="http://ajax.googleapis.com/ajax/libs/jquery/"+g+"/jquery.min.js";c.onload=c.onreadystatechange=function(){if(!b&&(!(d=this.readyState)||d=="loaded"||d=="complete")){h((f=e.jQuery).noConflict(1),b=1);f(c).remove()}};a.documentElement.childNodes[0].appendChild(c)}})(window,document,"2.0.3",function($,L){

    // speak current webpage
    // jhobbs 2013
    // chunking by getflourish 2015

    function stop(){

        speechSynthesis.cancel();

    }

    function pause(){

        speechSynthesis.pause();

    }

    function resume(){

        speechSynthesis.resume();

    }

    function getVoices(){

        var voices = speechSynthesis.getVoices();
          for(var i = 0; i < voices.length; i++ ) {
            console.log("Voice " + i.toString() + ' ' + voices[i].name);
          }

    }

    function play(articleText){

        if((navigator.userAgent.match(/iPhone/i)) ||
            (navigator.userAgent.match(/iPod/i))  ||
            (navigator.userAgent.match(/iPad/i))) {
            rate = 0.66;
        } else {
            rate = 1;
        }

        var speech = new SpeechSynthesisUtterance();
        speech.rate = rate;
        speech.pitch = 1;
        speech.text = articleText;
        speech.volume = 1;
        speech.lang = "en-US";
        speech.voiceURI = "Tom";
        speech.onstart = function(event) { console.log('Started speaking.'); };
        speech.onend = function(event) { console.log('Stopped speaking.'); };
        speech.onpause = function(event) { console.log('Paused.'); };
        speech.onresume = function(event) { console.log('Resumed.'); };
        speech.onmark = function(event) { console.log('Reached mark.'); };
        speech.onboundary = function(event) { console.log('Reached boundary.'); };

        var chunks = articleText.split(/[\.!;\–\?\:]+[\s]+/g);

        if (chunks != null) {
            // add the last chunk if it has no sentence end
            var lastChunk = chunks[chunks.length];
            if (articleText.indexOf(lastChunk) == articleText.length - chunks.length) {
                chunks.push(what.substr(articleText.indexOf(lastChunk), articleText.length));
            }

            for (var i = 0; i < chunks.length; i++) {
                speech = new SpeechSynthesisUtterance(chunks[i]);
                window.speechSynthesis.speak(speech);
            }
        } else {
            speech = new SpeechSynthesisUtterance(articleText);
            window.speechSynthesis.speak(speech);
        }

        speechSynthesis.speak(speech);
        var isPlaying = true;

    }

    var url = document.location.href.match(/(^[^#]*)/)[0];
    var readabilityToken = "YOUR_READABILITY_API_TOKEN";
    var apicall = "https://readability.com/api/content/v1/parser?url="+url+"&token="+readabilityToken+"&callback=?";
    console.log("Readability apicall: " + apicall);

    $.getJSON(apicall, function(data) {

        $("body").html("");
        $("body").css("padding","5% 25%");
        $("body").html("<div id='article-text'></div>");
        $("#article-text").css("width","50%");
        $("#article-text").css("font-family","Georgia, serif");

        $("#article-text").append("<p><a href='#' onclick='play(articleText);'>Play</a> | <a href='#' onclick='stop();'>Stop</a> | <a href='#' onclick='pause();'>Pause</a> | <a href='#' onclick='resume();'>Resume</a></p>");

        $("#article-text").append("<h2 id='article-headline'><strong>"+data.title+"</strong></h2>");

        if(data.author){
            $("#article-text").append("<p><strong>"+data.author+"</strong></p>");
        }

        if(data.date_published){
            var pubDate = data.date_published;
            $("#article-text").append("<p><strong>"+pubDate+"</strong></p>");
        }

        if(data.lead_image_url){
            $("#article-text").append("<div id='lead_image_url'><img src='"+data.lead_image_url+"'/></div>");
            $("#lead_image_url").css("display","inline");
            $("#lead_image_url").css("float","right");
            $("#lead_image_url").css("padding","0px 0px 8px 8px");

        }

        $("#article-text").append(data.content);

        rawContent = data.content;
        var scrubbedRawContent = rawContent.replace(/<(?:.|\n)*?>/gm, '');
        articleText = data.title + $(data.content).text();
        console.log(articleText);
        getVoices();
        play(articleText);

    });

});