Thank you for the link, but this looks impressively cumbersome, considering that it's just about a simple import...
As my (new) Opera installation is for pure testing without any important data, could I completely purge Opera, reinstall and hope that I can import Opera 12.x data one more time (as it really seems to be a 'once in a lifetime' feature)?
Or reset all user data and then import?
Or invert the flags which indicates that I already used my import-chance?
TIA