Examine source code of KanbanTab

{
  "short_name": "KanbanTab",
  "name": "KanbanTab",
  "manifest_version": 3,
  "version": "2.2.1",
  "description": "Transform your new tab into an instant kanban board for efficient task management without having to wait for loading times.",
  "icons": {
    "16": "assets/icon/icon@16.png",
    "19": "assets/icon/icon@19.png",
    "39": "assets/icon/icon@39.png",
    "48": "assets/icon/icon@48.png",
    "128": "assets/icon/icon@128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "permissions": [
    "unlimitedStorage",
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "host_permissions": [
    "https://kanbantab.com/*"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+K"
      }
    }
  },
  "action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{a103c550-4d57-43fc-8fce-54a92df56f84}"
    }
  }
}