Examine source code of Cerolingo

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Cerolingo",
  "author": "ancym0n",
  "description": "Duolingo answer automation extension",
  "version": "3.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "cerolingo@ancymon.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.duolingo.com/*",
        "*://*.duolingo.cn/*"
      ],
      "js": [
        "src/js/main.js",
        "src/js/auto-answer.js",
        "src/js/legendary-bypass.js",
        "src/js/xp-exploit.js",
        "src/js/mod-menu.js",
        "src/js/story-highlight.js"
      ],
      "css": [
        "src/css/style.css"
      ]
    },
    {
      "matches": [
        "*://*.duolingo.com/lesson/*",
        "*://*.duolingo.com/story/*",
        "*://*.duolingo.cn/lesson/*",
        "*://*.duolingo.cn/story/*"
      ],
      "js": [
        "src/js/audio-block.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    }
  ],
  "icons": {
    "512": "src/img/logo.png"
  },
  "action": {
    "default_popup": "src/html/popup.html",
    "default_icon": {
      "512": "src/img/logo.png"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "src/img/cerolingo-title.svg"
      ],
      "matches": [
        "*://*.duolingo.com/*",
        "*://*.duolingo.cn/*"
      ]
    }
  ]
}