Examine source code of SpeedMe

{
  "manifest_version": 2,
  "name": "SpeedMe",
  "version": "1.1",
  "description": "Gives the user functionality for speeding up and slowing down a Youtube video from 0 times speed to 16 times speed quickly and efficiently",
  "icons": {
    "48": "icons/border-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "speedme.js"
      ],
      "css": [
        "main.css"
      ]
    }
  ]
}