Add extra speed options like 2x playback on EdX videos.

edx_speed_options.js

// In the new EdX, a redirect is required to go inside the iframe before executing custom JavaScript
open(document.getElementById('unit-iframe').src)

// After the new tab is opened, you can run the code below in that tab (not the old tab).
// To use, paste into your DevTools console, create a bookmarklet, or use a browser extension like Tampermonkey.
const addSpeedOption = (speed) =>
  $('.video-speeds').prepend(`<li data-speed="${speed}"><button class="control speed-option" tabindex="-1" aria-pressed="false">${speed}x</button></li>`)

addSpeedOption(2);
addSpeedOption(2.5);