Examine source code of Telegram Blur

{
  "name": "Telegram Blur",
  "description": "Blur private Telegram Web content locally, including chats, messages, media and avatars.",
  "version": "1.2",
  "manifest_version": 3,
  "permissions": [
    "storage",
    "tabs"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://web.telegram.org/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "turbo@telegramblur",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}