Fantastica comunicación, entre Icloud, Iphone, y Windows, todo a la perfección, como appel

i think it would have bin better keeping sync off to keep from duplicateing

As many others have said, it doesn't work. Mozilla should probably just remove the extension until Apple decides to maintain it.

If you enable Firefox sync in the iCloud settings it directs you to download the extension which you have already downloaded. This is a straight up bug in iCloud but I don't have high hopes that it will get fixed given the generally abysmal quality of iCloud on Windows.