Examine source code of TMDB Player

{
  "manifest_version": 3,
  "name": "TMDB Player",
  "version": "1.2.1",
  "description": "Adds a custom play button to TMDB pages, allowing users to stream movies and TV shows for free.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://www.themoviedb.org/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tmdbplayerext@nunesnetwork.org"
    }
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.themoviedb.org/movie/*"
      ],
      "js": [
        "content/utils.js",
        "content/movie.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://www.themoviedb.org/tv/*"
      ],
      "js": [
        "content/utils.js",
        "content/tv.js"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}