Examine source code of Vocabulary Tracker

{
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    "gecko": {
      "id": "{df8d1848-a337-41fa-b2cc-7f6d095aafbd}"
    }
  },
  "manifest_version": 3,
  "name": "Vocabulary Tracker",
  "version": "1.0",
  "description": "Track and remember vocabulary searches on Google.",
  "permissions": [
    "storage"
  ],
  "background": {
    "page": "background.html",
    "service_worker": "background.js",
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  }
}