html5 - How to fix jittery audio/video on firefox when playback rate set to .5x using javascript? -

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i trying set experiment in playing .mp4 videos , changing playback rates using base javascript (no libraries) , html5 (mac osx 10.10.4). when change playback rate of video .5x, although audio-video slowed down, audio sounds jittery on firefox (version 39.0.3). problem not pronounced on chrome (version 44.0.2403.130, 64-bit), safari (version 8.0.7) or ie (version 11+). there way can make make audio video sound less noisy when using firefox?

<script type="text/javascript"> var videos = ['2.4.mp4', '3.2.mp4', '2.8.mp4'] var rates = [.5, 1, .5] function setupstim(){     stim = document.getelementbyid('movie');      stim.addeventlistener('loadeddata', function() {         stim.defaultplaybackrate = rates[trialnum];         stim.playbackrate = rates[trialnum];         stim.play();         settimeout(enablebuttons,stim.duration*1000);     }, false); }  function stimulus(trialnum, moviename,rate,response, rt) {     this.trialnum = trialnum;     this.moviename = moviename;     this.rate = rate;     this.response = response;     this.rt=rt; }  function playvideo(){     hide('start');     stim.src = "https://s3.amazonaws.com/mcgurkstimuli/" + videos[trialnum];     document.getelementbyid('p3').innerhtml = (trialnum + 1)+ ' / '+ n;     time0=performance.now();     return time0; }  function choice(resp){     var time1 = performance.now();     stim.rt = math.round(time1-time0);     stim.response = resp;     videos[trialnum] = new stimulus(trialnum,stim.src,rate,resp,stim.rt);     videos[trialnum].rt = stim.rt;     videos[trialnum].response = stim.response;     videos[trialnum].moviename = stim.src;     videos[trialnum].rate = stim.playbackrate;     videos[trialnum].trial=trialnum;     data +=videos[trialnum];     document.getelementbyid("inputfields").innerhtml = data;     trialnum++;     if (trialnum<n){         playvideo();     }     else {         hideoptions();         hide('movie');     } } </script>  <p><button class="startbutton" id="start" onclick="playvideo()" type="button">begin task</button>      <video id="movie" onended="showoptions()"><source /></video> </p>

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