Examine source code of Skip Prime Video Intro

{
  "manifest_version": 2,
  "name": "Skip Prime Video Intro",
  "version": "1.4",
  "description": "Addon to automatically skip ads & intros on Amazon Prime Video",
  "applications": {
    "gecko": {
      "id": "skip_prime_video_intro@jonas-hellmann.de"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.de/*",
        "*://*.amazon.com/*",
        "*://*.amazon.com.au/*",
        "*://*.amazon.com.br/*",
        "*://*.amazon.ca/*",
        "*://*.amazon.cn/*",
        "*://*.amazon.fr/*",
        "*://*.amazon.in/*",
        "*://*.amazon.it/*",
        "*://*.amazon.co.jp/*",
        "*://*.amazon.com.mx/*",
        "*://*.amazon.es/*",
        "*://*.amazon.co.uk/*"
      ],
      "js": [
        "skip_prime_video_intro.js"
      ]
    }
  ]
}