Examine source code of Seenify Email Tracker

{
  "manifest_version": 3,
  "name": "Seenify - Email Tracker",
  "short_name": "Seenify",
  "version": "3.2.2",
  "description": "Track email opens in real time, get read receipts, monitor recipients individually, and receive instant notifications.",
  "author": "codeguyakash",
  "homepage_url": "https://seenify.codeguyakash.in",
  "browser_specific_settings": {
    "gecko": {
      "id": "seenify@codeguyakash.in",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "notifications",
    "alarms"
  ],
  "host_permissions": [
    "https://mail.google.com/*",
    "https://seenify.codeguyakash.in/*"
  ],
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "src/assets/icon-16x16.png",
      "24": "src/assets/icon-24x24.png",
      "32": "src/assets/icon-32x32.png",
      "48": "src/assets/icon-48x48.png",
      "128": "src/assets/icon-128x128.png"
    }
  },
  "icons": {
    "16": "src/assets/icon-16x16.png",
    "24": "src/assets/icon-24x24.png",
    "32": "src/assets/icon-32x32.png",
    "48": "src/assets/icon-48x48.png",
    "128": "src/assets/icon-128x128.png"
  },
  "background": {
    "scripts": [
      "src/utils/auth.js",
      "src/background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "src/content/content.js"
      ],
      "css": [
        "src/content/content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "src/assets/*"
      ],
      "matches": [
        "https://mail.google.com/*"
      ]
    }
  ]
}