Examine source code of Universal Sidebar

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "{c57c5b60-bb54-4e19-9d45-1240bba3c95f}"
    }
  },
  "name": "Universal Sidebar",
  "version": "2.1.2",
  "description": "Universal Sidebar allows users to open websites in a sidebar for quick and easy access.",
  "permissions": [
    "storage"
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Universal Sidebar",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "sidebar_action": {
    "default_title": "Universal Sidebar",
    "default_panel": "sidebar.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "commands": {
    "toggle-sidebar": {
      "suggested_key": {},
      "description": "Toggle the sidebar"
    }
  }
}