Examine source code of eucm for Surfly

{
  "manifest_version": 3,
  "name": "eucm for Surfly",
  "description": "eucm transfer cookies from a website to Surfly session on the fly",
  "version": "0.9.0",
  "icons": {
    "64": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c72e9abe-1b82-11ee-8322-f02f741aae15}",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "webNavigation",
    "cookies"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}