Superman are these on the same computer or the same profile? Please rename the device in the sync profile. If not, in order to further investigate: * How do I turn on sync logs: # Open about:config and turn on: services.sync.log.appender.file.logOnSuccess and services.sync.log.logger.engine.bookmarks # Restart Firefox and look at: about:sync-log # Logs and error messages will be located here Please also use pastebin.mozilla.org for sharring any errors that relate to this issue. Thank you.