I thought I'll add my observations after a week of use

Based on the sites I visit regulary (and there aren't that many, btw) 9.3.0 crashed more often than 9.2.3. I swithced back to 9.2.3 for the time being. I'm not bad mouthing or anything - it's just me and my 5c.

Anyway, I still highly appreciate the work of people behind Classilla.