not good.

FirefoxとSafariのブックマークが同期でき便利ですが致命的なバグがいつまでたっても直らないので使用をやめました。
ブックマークが増殖します。icloudの機能としてあるものなのにアプリの更新もなく放置されています。さすがアップルです。

其实可以用，但是会提示没有安装，但明明可以同步火狐

此軟體在W10根本無法使用 請盡可能更新

Crap shoot! Good when it works...Bookmark sync with FF stopped working after iOS 15. Odd behavior on Windows 10 (from the store) client when changing settings attempting to troubleshoot. Change bookmark settings and photo settings get changed. Sadly, no support available as Apple is well known for their lack of support to Windows versions of their products.

Doesn't work after it had worked for several months