Examine source code of Plexboxd

{
  "manifest_version": 2,
  "name": "Plexboxd",
  "version": "1.4.0",
  "description": "View letterboxd ratings for your movies on plex.",
  "browser_specific_settings": {
    "gecko": {
      "id": "lennysgarage42@gmail.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "128": "images/icon-128.png",
    "192": "images/icon-192.png",
    "512": "images/icon-512.png"
  },
  "web_accessible_resources": [
    "images/letterboxd-decal-dots-pos-rgb-500px.png"
  ],
  "content_scripts": [
    {
      "js": [
        "scripts/content.js"
      ],
      "css": [
        "letterboxd.css"
      ],
      "matches": [
        "https://app.plex.tv/desktop/*",
        "http://127.0.0.1:32400/web/*",
        "http://127.0.0.1/web/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "permissions": [
    "https://letterboxd.com/*"
  ]
}