Examine source code of Classroom Dark Mode

{
  "manifest_version": 2,
  "name": "__MSG_application_title__",
  "description": "__MSG_application_description__",
  "homepage_url": "https://classroomdarkmode.ryanluu.dev/",
  "version": "0.1.9",
  "default_locale": "en_US",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://classroom.google.com/*"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "classroomdarkmode@ryanluu.dev"
    }
  },
  "author": "ryan.luu@ryanluu.dev"
}