Não funciona, mesmo com o add-on já instalado, sempre pede para instalar a extensão favoritos para o Firefox e nunca conclui.

Simply does't work. I get a notification I should install this every time icloud starts, but it is already installed. Uninstalled and installed again, still nothing. Thanks Apple!

It just works. Seems to sync to my Safari bookmarks, on my iPhone, in a matter of seconds, based on my recent experience.