Examine source code of Refined Prime Video

{
  "name": "Refined Prime Video",
  "description": "Adds small tweaks and useful new features to Amazon Prime Video.",
  "homepage_url": "https://github.com/shroudedcode/refined-prime-video#readme",
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Refined Prime Video",
    "default_popup": "popup.html",
    "browser_style": true
  },
  "version": "24.4.24.1210",
  "permissions": [
    "storage",
    "https://*.primevideo.com/*",
    "https://*.amazon.com/*",
    "https://*.amazon.co.uk/*",
    "https://*.amazon.de/*",
    "https://*.amazon.co.jp/*",
    "https://www.primevideo.com/",
    "https://www.amazon.com/",
    "https://www.amazon.co.uk/",
    "https://www.amazon.de/",
    "https://www.amazon.co.jp/"
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://*.primevideo.com/*",
        "https://*.amazon.com/*",
        "https://*.amazon.co.uk/*",
        "https://*.amazon.de/*",
        "https://*.amazon.co.jp/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "{d2d5c630-405c-4415-a627-e6c90dd8f568}",
      "strict_min_version": "55.0"
    }
  }
}