Examine source code of YouTube Publish Time

{
  "manifest_version": 3,
  "name": "YouTube Publish Time",
  "version": "2.2.2",
  "description": "Shows YouTube publish time in local timezone. Includes popup with author info and enable/disable toggle.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{012a1e46-467b-4ead-bd56-9071c7d519fa}",
      "strict_min_version": "115.0"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ]
}