Examine source code of PDF Shark

{
  "name": "PDF Shark",
  "description": "PDF Shark is a powerful PDF converter tool. Convert PDF to DOC and DOC to PDF with just a simple drag-and-drop",
  "version": "1.0.1",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "64": "images/icon64.png"
    },
    "default_title": "PDF Shark",
    "default_popup": "index.html"
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "64": "images/icon64.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9133bc57-ea1e-4295-9f13-d9f720df75dd}"
    }
  }
}