Examine source code of Youtube Playback Speed

{
  "manifest_version": 2,
  "name": "Youtube Playback Speed",
  "version": "1.1.0",
  "description": "Addon to allow automatic adjustment of youtube video playback speed.  Also allows adjustment beyond default options.",
  "homepage_url": "https://github.com/RagingRoosevelt/YouTube-Playback-Speed",
  "icons": {
    "64": "icons/64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "inject-playback-speed.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/64.png",
    "default_title": "Adjust Playback Speed",
    "default_popup": "popup/adjust_speed.html"
  },
  "applications": {
    "gecko": {
      "id": "youtube-playback-speed@pureimaginat.io"
    }
  },
  "permissions": [
    "storage"
  ]
}