Examine source code of PDF Coder

{
  "manifest_version": 2,
  "name": "PDF Coder",
  "version": "1.0.2",
  "description": "Quick access to PDF Coder's professional PDF tools - compress, convert, merge, split, watermark, and view PDFs",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "PDF Coder Tools",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ahmed@pdfcoder.com"
    }
  }
}