Examine source code of Modern Classroom

{
  "manifest_version": 2,
  "name": "Modern Classroom",
  "version": "3.6.1",
  "description": "A redesigned Google Classroom with Dark mode, advanced customisation, folders, and more",
  "permissions": [
    "storage",
    "*://classroom.google.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://classroom.google.com/*"
      ],
      "css": [
        "styles.css",
        "dark.css"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "web_accessible_resources": [
    "Icons/*",
    "Tutorial/*",
    "Decoration/*"
  ],
  "developer": {
    "name": "Community Port (Unofficial)"
  },
  "homepage_url": "https://classroom.google.com",
  "incognito": "not_allowed",
  "browser_specific_settings": {
    "gecko": {
      "id": "modern-classroom@local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}