Examine source code of Video Speeder

{
  "manifest_version": 2,
  "name": "Video Speeder",
  "version": "0.1",
  "description": "Speeds up HTML5 videos in the current tab.",
  "homepage_url": "https://github.com/sashkab/firefox_video_speeder",
  "icons": {
    "48": "icons/048.png",
    "96": "icons/096.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/048.png",
      "96": "icons/096.png"
    },
    "theme_icons": [
      {
        "light": "icons/016-light.png",
        "dark": "icons/016-dark.png",
        "size": 16
      },
      {
        "light": "icons/032-light.png",
        "dark": "icons/032-dark.png",
        "size": 32
      }
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "videospeeder.js"
    ]
  }
}