Used to work perfect until November 2019. Never had any problems with the sync of my Firefox bookmarks to my iPhone/iPad. Got a new laptop (Windows 10/64 bit) in November, since then this AddOn including iCloud for windows keeps tripling my booksmarks and even restores old, already deleted bookmarks.

PARA CUANDO PARA WINDOWS 10

Even if you add the app on iCloud still won't back up your Bookmarks all you get is a pop up window telling you to download the app, but you already did. So it's useless.

Crashes every time and I am not going to the abusive apple site to try to find an answer.

I hate this and I can't figure out how to cancel/reverse it. Help me please

Exactly Same!!!!!
Windows 10 Pro (64bit) + Firefox 71 (64bit)

"Will not work on Windows 10 64bit. Does not recognize that the Add-On is installed, even though it is. As about 350 others have said, this is worthless. Keeps prompting me to download and install a file. Takes you into an endless loop of BS. I stopped trying. How is it possible that they have not fixed this issue. Not like Windows 10 and Firefox are new!" -Michael Lynch

Same!!!!!

"Will not work on Windows 10 64bit. Does not recognize that the Add-On is installed, even though it is. As about 350 others have said, this is worthless. Keeps prompting me to download and install a file. Takes you into an endless loop of BS. I stopped trying. How is it possible that they have not fixed this issue. Not like Windows 10 and Firefox are new!" -Michael Lynch

Same!!!!!

火狐浏览器已安装icloud扩展，仍不停的提示下载安装icloud扩展。

Will not work on Windows 10 64bit. Does not recognize that the Add-On is installed, even though it is. As about 350 others have said, this is worthless. Keeps prompting me to download and install a file. Takes you into an endless loop of BS. I stopped trying. How is it possible that they have not fixed this issue. Not like Windows 10 and Firefox are new!

Extension keeps prompting me to download/install in Firefox, even though it's already installed. Unable to activate the Extension despite repeated attempts.

FAIL. Doesn't work on Windows 10 64-bit. I tried to save my Firefox bookmarks to my iCloud account but was unable to. I am repeatedly prompted to download the iCloud Bookmarks extension for Firefox even though it has already been downloaded. Waste of time.

No funciona, al intentar habilitar la opción en la aplicación de iCloud para Windows siempre manda instalar la extensión sin hacer nada más.

iCloud fordert auf, die Lesezeichenerweiterung zu installieren => ist sie aber bereits

Stopped working.

Doesn't work. iCloud client gives a prompt to install the extension, but it's been already installed

Installation aborted because the add-on appears to be corrupt.