Examine source code of Burbly — Flashcard Capture

{
  "manifest_version": 3,
  "name": "Burbly — Flashcard Capture",
  "version": "0.2.0",
  "description": "Capture knowledge from the web and convert it into Burbly flashcards. Includes YouTube video flashcard creator with frame capture.",
  "browser_specific_settings": {
    "gecko": {
      "id": "burbly@burbly.app",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteContent",
          "websiteActivity"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    },
    "default_title": "Burbly"
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_title": "Burbly — YouTube Flashcards",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/watch*"
      ],
      "js": [
        "content/youtubeContentScript.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "scripting",
    "identity"
  ],
  "host_permissions": [
    "https://*.firebaseapp.com/*",
    "https://accounts.google.com/*",
    "https://firestore.googleapis.com/*",
    "https://identitytoolkit.googleapis.com/*",
    "https://securetoken.googleapis.com/*",
    "https://proxy-server-five-green.vercel.app/*",
    "https://www.youtube.com/*"
  ],
  "commands": {
    "open-flashcard-panel": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "Command+Shift+F"
      },
      "description": "Open the YouTube flashcard creator panel"
    }
  }
}