Examine source code of Release Battlefield

{
  "manifest_version": 2,
  "name": "Release Battlefield",
  "version": "1.9.0",
  "description": "Release Battlefield Extension",
  "applications": {
    "gecko": {
      "id": "release-battlefield@example.com",
      "strict_min_version": "128.0"
    }
  },
  "background": {
    "scripts": []
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ]
}