Examine source code of SEI Legis

{
  "manifest_version": 2,
  "name": "SEI Legis",
  "short_name": "SEI Legis",
  "description": "Adiciona ao Sistema Eletrônico de Informações (SEI) a função de enumerar normas conforme regras da Lei Complementar nº 95, de 1998",
  "version": "0.0.12",
  "author": "Pedro Henrique Soares",
  "homepage_url": "https://pedrohsoaresadv.github.io/sei-legis/",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "pedrohsoares.adv@gmail_seilegis"
    }
  },
  "applications": {
    "gecko": {
      "id": "pedrohsoares.adv@gmail_seilegis",
      "strict_min_version": "53.0"
    }
  },
  "content_scripts": [
    {
      "js": [
        "js/lib/jquery-3.4.1.min.js",
        "js/lib/jmespath.min.js"
      ],
      "matches": [
        "*://*.br/sei/*",
        "*://*.br/sip/*"
      ]
    },
    {
      "js": [
        "js/lib/jquery-3.4.1.min.js",
        "js/lib/jmespath.min.js",
        "js/init.js"
      ],
      "run_at": "document_end",
      "matches": [
        "*://*.br/*controlador.php?acao=editor_montar*"
      ]
    }
  ],
  "web_accessible_resources": [
    "js/sei-legis.js",
    "js/lib/jquery-3.4.1.min.js",
    "js/lib/jmespath.min.js"
  ]
}