Complete piece of garbage; on two separate Macs. Cannot login; error every time. I reset my password and was able to get in only once on each Mac. After that, login error every time.
When I did manage to get in once, all syncing generated errors and nothing worked.

A complete and utter POS.

After this horrible experience, I purged everything regarding Firefox from both Macs. Never more.

Unable to login in, not syncing. Piece of crap.

Recent convert from Xmarks. ES seemed to work well until recent update. Have these issues now:

- Extension update disabled bookmark auto-sync ; had to re-enable after realizing the change
- "Manual Sync" options don't actually have a manual *sync* button ; is a true manual sync reserved for paying customers? Can only *merge* local/server data (which doesn't *sync*), or up/download data which are 1-way overwrites

UPDATE:
- Just found that when Eversync options page is open (not taking any action), Firefox CPU goes to ~13% until options page is closed. Wow.
- No prompt to verify manual download ; only to upload
- "Enable auto sync" option keeps becoming disabled

Time to look for yet another cross-browser bookmark sync tool...

UPDATE 2:
Review has been flagged. Apparently can't handle the truth?

Не устанавливайте! Синхронизация мало того, что работает с глюками, так тут еще и КВОТА установлена!
Денег, им нужно ТОЛЬКО денег ...

Before without imposing curves of funuts and payment, it was much better

Not works in Firefox under Linux