I already have and this does not work.  Where are the log files for this EverSync add-On?  Firefox never finishes syncing.  

No, not while syncing.  It's permanently not allowing any edits/changes to my bookmark Library in Firefox.  I have to disable the Add-On, restart Firefox.  Then make any edits, changes, with the Add-On disabled, Then re-enable the Add-On and restart Firefox.  Eversync should not be completely locking me out of my bookmarks like this.