Examine source code of Note Custome Dashboard

{
  "browser_specific_settings": {
    "gecko": {
      "id": "the-town-note-custome-dashboard@example.com"
    }
  },
  "manifest_version": 3,
  "name": "Note Custome Dashboard",
  "version": "1.0",
  "description": "Noteのダッシュボードを拡張する拡張機能",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://note.com/sitesettings/stats"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "sidebar_action": {
    "default_title": "Note Dashboard",
    "default_panel": "dashboardchart.html"
  },
  "icons": {
    "32": "img/icon.png"
  }
}