Examine source code of Clean Title

{
  "name": "Clean Title",
  "description": "Clean Title clears the tab title from those annoying notification numbers.",
  "version": "0.4.0",
  "manifest_version": 3,
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "https://www.youtube.com/*",
        "https://www.twitch.tv/*",
        "https://twitter.com/*"
      ],
      "js": [
        "scripts/clean-title.js"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "16": "/images/icon16.png",
      "32": "/images/icon32.png",
      "48": "/images/icon48.png",
      "128": "/images/icon128.png"
    }
  },
  "icons": {
    "16": "/images/icon16.png",
    "32": "/images/icon32.png",
    "48": "/images/icon48.png",
    "128": "/images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "clean-title@dicyroll.com",
      "strict_min_version": "109.0"
    }
  }
}