Examine source code of TabSpace

{
  "manifest_version": 3,
  "name": "TabSpace",
  "description": "A scratch space for your new tab page.",
  "version": "1.5.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@tabspace.com",
      "strict_min_version": "100.0"
    }
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "128": "logo128.png",
    "192": "logo192.png",
    "512": "logo512.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "New Tab Notes",
    "default_icon": {
      "128": "logo128.png",
      "192": "logo192.png",
      "512": "logo512.png"
    }
  },
  "sidebar_action": {
    "default_title": "Sidebar Notes",
    "default_panel": "index.html",
    "default_icon": {
      "128": "logo128.png",
      "192": "logo192.png",
      "512": "logo512.png"
    }
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Alt+Shift+N"
      },
      "description": "Toggle the Sidebar Notes."
    }
  }
}