Examine source code of Simple Document Viewer

{
  "manifest_version": 2,
  "name": "Simple Document Viewer",
  "short_name": "Simple Document Viewer",
  "description": "View any links now, even from Google Drive!",
  "version": "0.2",
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "script.js"
    ]
  },
  "icons": {
    "16": "images/16.png",
    "32": "images/32.png",
    "64": "images/64.png",
    "128": "images/128.png"
  },
  "browser_action": {
    "default_icon": "images/128.png",
    "default_title": "Simple Document Viewer",
    "default_popup": "popup.html"
  },
  "homepage_url": "https://github.com/Abdul-Majid-Syed/Simple-Document-Viewer"
}