Examine source code of LotoBR

{
  "manifest_version": 2,
  "author": "H2 Online Solutions",
  "name": "LotoBR",
  "description": "Ferramenta para facilitar seus jogos nos sites das loterias do Brasil",
  "version": "1.0.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "lotobr@h2os.tech",
      "strict_min_version": "79.0"
    }
  },
  "icons": {
    "48": "assets/logo/clover_plain.svg",
    "96": "assets/logo/clover_plain.svg"
  },
  "page_action": {
    "default_title": "Abrir LotoBR",
    "browser_style": true,
    "default_icon": "assets/logo/24x24.png",
    "show_matches": [
      "https://*.loteriasonline.caixa.gov.br/*"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "content/lotocaixajscontrol/src/LotoCaixaControl.js",
        "content/content.js"
      ],
      "matches": [
        "https://*.loteriasonline.caixa.gov.br/*"
      ]
    }
  ],
  "background": {
    "page": "index.html?page=background"
  },
  "web_accessible_resources": [
    "content/lotocaixajscontrol/src/lcjsc_inject.js"
  ]
}