Examine source code of Advanced Twitter Search

{
  "manifest_version": 2,
  "name": "Advanced Twitter Search",
  "version": "0.0.2",
  "description": "Advanced Search For Twitter",
  "short_name": "Twitter Search",
  "author": "Sourav Pradhan",
  "homepage_url": "http://ats.imsourav.com/",
  "icons": {
    "16": "img/16x16.png",
    "32": "img/32x32.png",
    "48": "img/48x48.png",
    "128": "img/128x128.png"
  },
  "browser_action": {
    "default_title": "Advanced Twitter Search",
    "default_icon": {
      "16": "img/16x16.png",
      "32": "img/32x32.png",
      "48": "img/48x48.png",
      "128": "img/128x128.png"
    },
    "default_popup": "index.html"
  },
  "permissions": [
    "storage",
    "https://www.twitter.com/",
    "notifications"
  ],
  "optional_permissions": [
    "http://ats.imsourav.com/*",
    "https://ats.imsourav.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "css/content.css"
      ],
      "js": [
        "js/jquery.js",
        "js/content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  }
}