Examine source code of DocLogix Signature

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "version": "1.23.0",
  "applications": {
    "gecko": {
      "id": "listedsign@doclogix.com"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "matches": [
        "*://*/*",
        "file:///*"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "DocLogix Signature Extension",
  "manifest_version": 2,
  "name": "DocLogix Signature Extension",
  "icons": {
    "16": "DocLogix16.png",
    "48": "DocLogix48.png",
    "128": "DocLogix128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "DocLogix16.png",
      "48": "DocLogix48.png",
      "128": "DocLogix128.png"
    }
  },
  "web_accessible_resources": [
    "DocLogix16.png"
  ],
  "permissions": [
    "nativeMessaging",
    "activeTab",
    "https://ajax.googleapis.com/",
    "storage"
  ]
}