[STG plugin] Load custom group

Load custom group in Simple Tab Groups extention

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manifest.json

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "stg-plugin-load-custom-group@drive4ik",
      "strict_min_version": "112.0"
    }
  },
  "incognito": "not_allowed",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "2.0",
  "author": "Drive4ik",
  "homepage_url": "https://github.com/drive4ik/simple-tab-groups",
  "icons": {
    "96": "icons/icon.svg"
  },
  "action": {
    "default_area": "tabstrip",
    "default_icon": "icons/icon.svg",
    "default_title": "__MSG_defaultBrowserActionTitle__"
  },
  "permissions": [
    "notifications",
    "menus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "default_locale": "en",
  "commands": {
    "_execute_action": {
      "description": "__MSG_defaultBrowserActionTitle__"
    }
  }
}