Examine source code of YouTube Tag Extractor

{
  "manifest_version": 3,
  "name": "YouTube Tag Extractor",
  "version": "1.2.0",
  "description": "Extract tags, title, and download thumbnails from YouTube videos",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-tag-extractor@yoursite.com",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "activeTab",
    "downloads",
    "storage"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://youtube.googleapis.com/*",
    "*://*.ytimg.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "welcome.html"
      ],
      "matches": [
        "*://*.youtube.com/*"
      ]
    }
  ]
}