Opened Opera this morning and found nothing there. All customizations and extensions were gone. Thankfully bookmarks remained. I've been slowly switching to Opera from FF, but after a month I do not recall what extensions I installed or their settings. Is there a backup of my previous settings somewhere on my computer? Any idea what happened? I simply closed opera last night and opened it today, no reboot of the computer, no other changes.

Info:
Version: 38.0.2220.31 - Opera is up to date
Update stream: Stable
System: Ubuntu 14.04.3 LTS (x86_64; X-Cinnamon)