too many duplicates, wrong items being displayed. Log off/log in made no difference. Manage accounts-devices list and 'disconnect' didn't do any difference. In addition, yesterday FF on iOS kept crashing frequently which seems to be addressed with the new FF iOS update.

Background: always been using FF Account/Sync for keeping bookmarks, tabs, addons and prefs in sync across devices. Currently signed into FF sync on 6 devices-4 Apple devices and 2 Windows & of latter one is work laptop. Of the Apple devices, 1 phone got stolen and on new iPhone I restored from iCloud backup (of the stolen iPhone). Is that causing the sync errors?