Examine source code of Ghost Watch

{
  "manifest_version": 2,
  "name": "Ghost Watch",
  "version": "1.0.0",
  "description": "Watch movies together anonymously with subtle ghost indicators.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ghost-watch@local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}