Examine source code of PagalGuy Night Mode

{
  "name": "PagalGuy Night Mode",
  "icons": {
    "16": "logo16.png",
    "48": "logo48.png",
    "128": "logo128.png"
  },
  "browser_action": {
    "default_title": "PagalGuy Night Mode"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "author": "Sanchit Agarwal",
  "permissions": [
    "tabs",
    "activeTab",
    "https://*.pagalguy.com/*"
  ],
  "description": "Enables night mode for PagalGuy.",
  "version": "1.6.3",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "http://*.pagalguy.com/*"
      ],
      "css": [
        "dark-mode.css"
      ],
      "js": [
        "background.js"
      ]
    }
  ]
}