Examine source code of Jugaadu Flex

{
  "name": "Jugaadu Flex",
  "description": "A browser extension to make FlexStudent better",
  "manifest_version": 3,
  "version": "2.2.1",
  "permissions": [
    "scripting",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "*://flexstudent.nu.edu.pk/*"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "favicon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jugaadu-flex@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://flexstudent.nu.edu.pk/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ]
}