Examine source code of Gmail app badge notification

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Gmail app badge notification",
  "version": "1.2.3",
  "manifest_version": 3,
  "description": "Show badge notifications in the taskbar when using Gmail as an app",
  "homepage_url": "https://github.com/aberonni/gmail-app-badge-notification",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mail.google.com/mail/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "storage",
    "contextMenus",
    "alarms"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}