Examine source code of Duolingo Fast Mode

{
  "manifest_version": 3,
  "name": "Duolingo Fast Mode",
  "version": "1.5.0",
  "description": "Learn more on Duolingo. Hints help you save time and stress less.",
  "background": {
    "scripts": [
      "shims/storage-session-compat.js",
      "shims/execute-script-compat.js",
      "shims/sidepanel-compat.js",
      "shims/declarative-net-request-stub.js",
      "shims/user-scripts-compat.js",
      "shims/tabs-windows-compat.js",
      "shims/runtime-compat.js",
      "shims/downloads-compat.js",
      "shims/privacy-stub.js",
      "shims/notifications-compat.js",
      "assets/scripts/background.js"
    ]
  },
  "action": {
    "default_popup": "assets/ui/popup.html",
    "default_title": "Duolingo Fast Mode"
  },
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "https://www.duolingo.com/"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.duolingo.com/*"
      ],
      "js": [
        "assets/scripts/content.js"
      ],
      "css": [
        "assets/styles/style.css"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/scripts/injected.js",
        "assets/images/*.svg"
      ],
      "matches": [
        "https://www.duolingo.com/*"
      ],
      "extension_ids": []
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "duolingo-fast-mode@converted-extension.org",
      "strict_min_version": "121.0"
    }
  },
  "icons": {
    "16": "assets/logo/logo-16.png",
    "48": "assets/logo/logo-48.png",
    "128": "assets/logo/logo-128.png"
  },
  "options_ui": {
    "page": "assets/ui/popup.html"
  }
}