Examine source code of Excel Shortcuts

{
  "manifest_version": 2,
  "name": "Excel Shortcuts",
  "version": "1.0.0",
  "description": "A sidebar add-on displaying Microsoft Excel shortcuts with search and platform filtering.",
  "permissions": [],
  "sidebar_action": {
    "default_title": "Excel Shortcuts",
    "default_panel": "sidebar.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "excel_shortcuts@benes.iwp.edu"
    }
  }
}