Examine source code of VerticalStackImproved

{
  "manifest_version": 3,
  "name": "VerticalStackImproved",
  "version": "1.1",
  "description": "Vertical Tab Manager",
  "author": "Vincent Nguyen",
  "permissions": [
    "tabs",
    "storage"
  ],
  "action": {
    "default_popup": "panel.html",
    "default_title": "VerticalStackImproved"
  },
  "sidebar_action": {
    "default_panel": "panel.html",
    "default_icon": "icon.png",
    "default_title": "VerticalStackImproved"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "improved-vertical-stack@vincevi83.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}