Examine source code of very cool dark mode

{
  "name": "very cool dark mode",
  "version": "3.0",
  "description": "google classroom and synergy under the moonlight 🌚",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "*://classroom.google.com/*"
      ],
      "js": [
        "index.js"
      ]
    },
    {
      "matches": [
        "*://ca-egusd-psv.edupoint.com/*"
      ],
      "js": [
        "edupoint.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ]
}