Examine source code of Telegram Keyword Alert

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.0.1",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "notifications",
    "alarms",
    "*://web.telegram.org/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "telegram-keyword-alert@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Telegram Keyword Alert",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://web.telegram.org/*"
      ],
      "run_at": "document_idle",
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}