Sincroniza perfectamente con iCloud

Used to work, now it will not work at all. When you select in iCloud settings to sync with Firefox, the ICloud app tells you that you must install the iCloud extension in Firefox, which I already have from before, and then it never accepts or keeps the box checked in the iCloud app. Have tried removing the Firefox extension and re-adding to no avail.

This doesn't work! Is it Firefox or is it iCloud? iCloud doen't recognize that the extension is already installed in Firefox. As such you cannot sync Safari bookmarks with Firefox. Apparently this 'bug' has been around for a while but as yet it's not been fixed.