Hello! You should use the same account for EverSync and Nimbus Notes. It's one eco-system: EverSync, Nimbus Notes, Live Start Page

Hello!

What's your OS and browser version? Also tell us your PC specs.

Hello! What's your OS and browser version?

Can you send us your Firefox profiles?

Did you try to reinstall Firefox browser?

Can we try Team viewer session?
https://www.teamviewer.com

Hello! Please, describe us what exactly happens.

Try to reinstall the addon. 

I installed addon in Opera 54 and then updated browser to the latest version 55.0.2994.44. Everything works fine.

Make sure that you click Apply changes button

What OS and browser version do you use? Can we try Team Viewer session? 

I've just checked folder reordering and it works fine.

Thank you! If it's possible, create video (screen cast) or we can try team viewer session.

You probably got Other bookmarks folder filled on your  PC 1 because of server folder Other bookmarks that you uploaded earlier. You can check it on everhelper.me/client