Examine source code of AP Classroom Auto Next

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "ap-auto-next@camron",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "name": "AP Classroom Auto Next",
  "version": "1.1.0",
  "description": "Wait 2 minutes, click Next, repeat. Toggle from the toolbar.",
  "permissions": [
    "storage",
    "tabs",
    "https://apclassroom.collegeboard.org/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "AP Auto Next",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://apclassroom.collegeboard.org/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}