Working! After several tries, I finally managed to import/sync my data from desktop to phone.



Unfortunately, I changed too many things to be sure of what the actual problem was, but I'll attempt to narrow it down as soon as time permits.



Two things I know I changed were: install in internal memory instead of SD card, and login to the server (with security key) first instead of going directly to the pairing.Other factors, such as addons, Wifi vs. 3G, etc. are probably irrelevant.



Fennec is now back on the SD card and I'll check on whether it keeps on syncing properly.



No other issues to report (yet). Thanks for giving us this version. Firefox in sync with the MacBook will be a pleasure to use.



Update: after 12 hours, sync still behaving as it should.