Examine source code of Cashu.me Sidebar

{
  "manifest_version": 3,
  "name": "Cashu.me Sidebar",
  "description": "Access a self hosted Cashu.me instance from the Firefox sidebar.",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "sidebar_action": {
    "default_panel": "sidebar.html",
    "default_title": "Cashu.me",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sidebar@cashu.me"
    }
  }
}