Barely works but wants money.
Drop this abandonware and use raindrop.io instead!

No sync anymore, fucking crap.

It's a good add-on.

Not working anymore. Have to log in constantly. Erratic behaviour showing backups.

Addon no longer logs in to sync

The synchronization works really well now. Eversync is a good replacement for xMarks.

Worked fine 'til yesterday, but now it doesn't work at all on Firefox 114.0.2x64. It doesn't sync/download/upload/merge. Reinstalled extension (now 18.5.7) doesn't solve. Seems still working fine in Chrome.

After I was orphaned from xMarks, it replaced it nicely.
But the only caveat is that when I do a search on a bookmark that is duplicated, it simply shows the 2 (or more duplicates) without telling me where it is located, in which subfolder they are found, making it difficult to organize them...
In the bookmark popup itself, it could show in which folder the link is located.
Fix this, and me and the rest of the guys will give 10 stars