Examine source code of Urdu for Web

{
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    },
    "default_popup": "src/inject/app/index.html",
    "default_title": "Urdu for Web"
  },
  "content_scripts": [
    {
      "css": [
        "src/inject/inject.css"
      ],
      "exclude_matches": [
        "*://twitter.com/*",
        "*://ur.wikipedia.org/*",
        "*://pnb.wikipedia.org/*",
        "*://quran.com/*"
      ],
      "matches": [
        "*://*/*"
      ]
    },
    {
      "css": [
        "src/inject/twitter.css"
      ],
      "matches": [
        "*://twitter.com/*"
      ]
    },
    {
      "css": [
        "src/inject/whatsapp.css"
      ],
      "matches": [
        "*://web.whatsapp.com/*"
      ]
    },
    {
      "css": [
        "src/inject/google.css"
      ],
      "matches": [
        "*://*.google.com/*",
        "*://*.google.com.pk/*",
        "*://*/search?*",
        "*://google.com.pk/*",
        "*://*/#q*"
      ]
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "default_locale": "en",
  "description": "Nastaleeq Font For Web - Supports Google, Facebook, Twitter, Whatsapp , Wikipeadia and many other wbsites which support Urdu language Tag or RTL direction.\r\n Uses :  Mehr Nastalique Font - Courtesy of Center for Speach And Lanuage Technologies (Previously @ ITU) - https://www.c-salt.org/downloads/mehr-e-nastaliq-font ",
  "homepage_url": "http://github.com/fahadyousafmahar/weburdu/",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "manifest_version": 2,
  "name": "Urdu for Web",
  "short_name": "Urdu",
  "permissions": [
    "*://*/*"
  ],
  "version": "3.1.0",
  "web_accessible_resources": [
    "src/inject/*.ttf"
  ],
  "incognito": "spanning",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e33f3961-7520-415c-83c6-306bf0f3d66f}"
    }
  }
}