Examine source code of Restrict

{
  "manifest_version": 2,
  "name": "Restrict",
  "version": "0.2resigned1",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "index.js"
      ]
    },
    {
      "matches": [
        "https://www.google.com/*",
        "https://www.google.co.in/*"
      ],
      "js": [
        "google.js"
      ]
    },
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "youtube.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "input.js"
    ]
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval' https://www.gstatic.com/ https://*.firebaseio.com https://www.googleapis.com; object-src 'self'",
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "permissions": [
    "tabs",
    "theme"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4a942534-2988-463e-9880-6c1adc9c7545}"
    }
  }
}