Examine source code of Fudo

{
  "name": "Fudo",
  "version": "0.0.0.17",
  "manifest_version": 2,
  "permissions": [
    "nativeMessaging",
    "storage"
  ],
  "background": {
    "scripts": [
      "main.js"
    ],
    "persistent": false
  },
  "externally_connectable": {
    "matches": [
      "*://*.deli.com.br/*",
      "*://*.fu.do/*",
      "*://localhost/*"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.deli.com.br/*",
        "https://*.fu.do/*",
        "*://localhost/*"
      ],
      "js": [
        "content_scripts.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "fudo-icon-16x16.png",
    "48": "fudo-icon-48x48.png",
    "128": "fudo-icon-128x128.png"
  },
  "applications": {
    "gecko": {
      "id": "{6bbac5ba-b656-4f61-9fb0-592b75408cfb}"
    }
  },
  "web_accessible_resources": [
    "web_scripts.js"
  ]
}