Examine source code of Profile Launcher

{
  "manifest_version": 2,
  "name": "Profile Launcher",
  "version": "1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "profile_launcherv1@hyseki.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "List and launch Firefox profiles",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "permissions": [
    "nativeMessaging",
    "storage"
  ],
  "commands": {
    "open-profile-list": {
      "suggested_key": {
        "default": "Shift+Alt+C"
      },
      "description": "Open the profile list popup"
    }
  }
}