Examine source code of Microsoft To Do

{
  "manifest_version": 2,
  "name": "Microsoft To Do as a Sidebar",
  "description": "Displays a sidebar that lets you see your tasks on Microsoft To Do.",
  "version": "3.0",
  "applications": {
    "gecko": {
      "strict_min_version": "73.0",
      "id": "{2906ab08-2862-4ef5-becb-37f7a72336c1}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "512": "icons/icon512.png"
  },
  "sidebar_action": {
    "default_icon": {
      "512": "icons/icon512.png"
    },
    "default_title": "To Do",
    "default_panel": "index.html"
  },
  "browser_action": {
    "default_icon": {
      "512": "icons/icon512.png"
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+T"
      }
    }
  }
}