Examine source code of Flash Transfer Pro

{
  "manifest_version": 2,
  "name": "Flash Transfer Pro",
  "version": "1.3.0",
  "description": "Transferencia rápida y entrada manual con formato automático.",
  "author": "Tu Nombre o Alias",
  "browser_specific_settings": {
    "gecko": {
      "id": "admin@qrtis.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "rayo.svg",
    "default_title": "Transferencia"
  },
  "icons": {
    "48": "rayo.svg",
    "96": "rayo.svg",
    "128": "rayo.svg"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "menus",
    "https://*/*",
    "http://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ]
}