Examine source code of Preenchedor CEF

{
  "manifest_version": 2,
  "name": "Preenchedor CEF",
  "description": "Esta extensão preenche automaticamente formulários no site loteriasonline.caixa.gov.br.",
  "version": "1.0",
  "icons": {
    "128": "128.png"
  },
  "browser_action": {
    "default_title": "Preencher CEF",
    "default_icon": {
      "128": "128.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "preenchedorCEF_albertorainha@gmail.com"
    },
    "edge": {
      "browser_action_next_to_addressbar": true
    },
    "safari": {
      "strict_min_version": "14",
      "strict_max_version": "20"
    }
  }
}