Examine source code of Assina.me

{
  "name": "Assina.me",
  "description": "Assine documentos usando seu certificado digital",
  "author": "extension@assina.em",
  "manifest_version": 2,
  "version": "0.1.3",
  "homepage_url": "https://www.assina.me",
  "icons": {
    "250": "icons/enabled-250.png"
  },
  "applications": {
    "gecko": {
      "id": "{09453a94-aebf-4f4d-96ec-e04ef55669b6}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "certlib.js"
  ],
  "browser_action": {
    "default_title": "Assina.me",
    "default_icon": {
      "250": "icons/disabled-250.png"
    }
  },
  "permissions": [
    "nativeMessaging",
    "activeTab"
  ]
}