Examine source code of Send To Telegram

{
  "manifest_version": 3,
  "name": "Send To Telegram",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "@send_to_telegram",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "Мгновенная отправка страниц, выделенного текста и картинок в ваш Telegram бот",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "contextMenus",
    "tabs"
  ],
  "host_permissions": [
    "*://*/*",
    "https://api.telegram.org/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "assets/icon16.png",
    "32": "assets/icon32.png",
    "48": "assets/icon48.png",
    "64": "assets/icon64.png",
    "128": "assets/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Send to Telegram",
    "default_icon": "assets/icon48.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}