Yes, this is really mystical. I have run abrowser from terminal, and now
there are no error messages nor crashes anymore. I will post later if this
problem reappears. Maybe running abrowser first time from the panel creates
some problems. Now I ran it also from panel and no problem.
regarding GUI:
all windows freezed couple of times (but not anymore), usually when
installing new packeges from synaptic. I could usually move mouse, and it was
unclear if process were finished or not. I resolved problem by brute force
restart.
I will report more, if something unexpected happens. At the moment I am so
overwhelmed about Trisquel.
