Examine source code of Text to PDF file

{
  "manifest_version": 2,
  "name": "Selected text to PDF",
  "short_name": "Save text as txt and pdf format",
  "description": "Save text or selected text as txt and pdf format using context menu",
  "version": "2.0.0",
  "icons": {
    "16": "assets/icon_16.png",
    "128": "assets/icon_128.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "assets/icon_16.png",
      "38": "assets/icon_128.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "jid1-JobPqtvtwG9w0A@jetpack",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "tabs",
    "activeTab",
    "contextMenus"
  ],
  "content_security_policy": "script-src 'self'; style-src 'self' 'unsafe-inline'; font-src 'self' data:; object-src 'self';",
  "background": {
    "scripts": [
      "data/pdfkit/pdfkit.js",
      "background.js"
    ]
  }
}