Bookmarklets to increase the playback rate of video or audio elements. Paste as the URL inside a bookmark.

1x_normal_speed.js

javascript:void function(){
  document.querySelectorAll("video,audio").forEach(function(c){
    let a=c.playbackRate;
    c.playbackRate=1,
      console.log(`changed media playback rate from ${a} to ${c.playbackRate}`)
  })
}();

1x_normal_speed.min.js

javascript:void function(){document.querySelectorAll("video,audio").forEach(function(c){let a=c.playbackRate;c.playbackRate=1,console.log(`changed media playback rate from ${a} to ${c.playbackRate}`)})}();

4x_speed.js

javascript:void function(){
  document.querySelectorAll("video,audio").forEach(function(c){
    let a=c.playbackRate;
    c.playbackRate=4,
      console.log(`changed media playback rate from ${a} to ${c.playbackRate}`)
  })
}();

4x_speed.min.js

javascript:void function(){document.querySelectorAll("audio,video").forEach(function(c){let a=c.playbackRate;c.playbackRate=4,console.log(`changed media playback rate from ${a} to ${c.playbackRate}`)})}();

plus_0.5_speed.js

javascript:void function(){
  document.querySelectorAll("audio,video").forEach(c=>{
    let a=c.playbackRate;
    4 > c.playbackRate ? c.playbackRate += .5 : c.playbackRate = 1,
      console.log(`changed media playback rate from ${a} to ${c.playbackRate}`)
  })
}();

plus_0.5_speed.min.js

javascript:void function(){document.querySelectorAll("audio,video").forEach(c=>{let a=c.playbackRate;4>c.playbackRate%3Fc.playbackRate+=.5:c.playbackRate=1,console.log(`changed media playback rate from ${a} to ${c.playbackRate}`)})}();