Examine source code of SEI PGD

{
  "manifest_version": 2,
  "name": "SEI PGD",
  "version": "1.14",
  "homepage_url": "https://github.com/marcelbonnet/firefox_sei",
  "author": "Marcel Bonnet",
  "description": "Facita o preenchimento do Programa de Gestão de Desempenho do Governo Federal no Sistema de Processo Eletrônico (SEI).",
  "browser_action": {
    "default_icon": "images/google-docs.png",
    "default_title": "SEI PGD",
    "browser_style": true,
    "default_popup": "html/pgd.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.sei.anatel.gov.br/*",
        "*://*.seisu.anatel.gov.br/*",
        "*://*.visao.anatel.gov.br/*",
        "*://appsnet/*"
      ],
      "js": [
        "js/sei_content.js",
        "js/marval_content.js",
        "js/postos_trabalho.js"
      ],
      "css": [
        "css/marval_content.css"
      ]
    }
  ],
  "sidebar_action": {
    "default_icon": {
      "16": "images/google-docs.png",
      "32": "images/google-docs.png"
    },
    "default_title": "PGD",
    "default_panel": "html/pgd.html",
    "open_at_install": false,
    "browser_style": false
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+L"
      }
    }
  },
  "content_security_policy": "default-src 'self'",
  "permissions": [
    "activeTab",
    "sessions",
    "tabs",
    "storage",
    "unlimitedStorage",
    "contextMenus",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7617f0ba-a01a-4b2a-be20-02b89a2a68ff}"
    }
  }
}