I have found it easy to create situations in which bookmark folders multiply seemingly indefinitely.
I think small differences in the bookmark hierarchy in the various connected browser instances can cause the same folders to be added because they are perceived as unique even though their names and contents are identical. I solved this issue by disabling manual synchronizing.

It works.

Can't log into my account on firefox only on chrome, making firefox unable to sync bookmarks.

This is a must have! Having suffered a computer crash or two or ten, I've known the frustration of losing all the favorite sites I've saved. Never again! I recently had a PC update that caused all kinds of problems, leaving me to do a system restore. Installed my browser, then EverSync extension, logged into it and BOOM! everything back. Simply love that this is out there and hope everyone appreciate what the developer(s) have given us! And its available for multiple browsers and you can use it across Chrome, Firefox, Opera, etc. A huge plus!!!

Fácil de usar. Configuración intuitiva. Sitio Web con acceso al backup.

Just not 5 stars, because the interface is not very pretty.

Suddenly I have only 3 bookmarks left, and there is no available local backups in my work computer. And I also found that in another browser which bookmarks haven't been deleted, there are some bookmarklets's url become "http://incorrecturl/"

unable to login using google or fb

Tolles Add On. Sofort auf meinem Tablet übernommen !!!

Please add profiles as Xmarks, even a paid option

Está bien, pero dá problemas con el Merge, etc...

Spy.

Only viable Xmarks alternative I could find.

Unfortunately apparently unmaintained now. Andrpd app and firefox addon are broken and nobody cares.

Doesn't work at all. Can't figure how to fix it.

It works just like Xmarks. I got the extension for FireFox 60 and for Internet Explorer and uploaded my bookmarks from FireFox to Eversync, and then downloaded from Eversync to Internet Explorer. Worked very quickly both uploading (650 bookmarks) and downloading. No duplication at all like some reviewers have reported. I can't tell that it is any different than Xmarks. Love it.