Horrible. It copies or "sync" with icloud but if you delete on firefox it will not delete on safari, (iOS), you need to also delete one by one on a mobile or using safari on a mac to remove duplicates or multiple at a time. I had multiple duplicates on Edge, Safari, Firefox and Chrome. 10k bookmarks.

No la recomiendo, me ha duplicado los marcadores varias veces.

Does not work with firefox for windows

закладки перестали синхронизироваться

Simple Easy Feels Greater Than Greater