I have learned to my surprise, that N82 was unstable in web browsing, just after installation of couple of programs and my "favourite" theme. Browser would often close for no apparent reason, more often when in "menu" mode. All of this despite tons of free RAM, etc. So, I started to roll back installed programs until I found a culprit. This was something I would expect the last - a theme! It is hard to believe, I thought that a theme is just a collection of pics and colour definitions, but it seems that SVG theme from PiZero, can cause such a strange instability in N82 browser (in my case that was New Gold SVG theme by PiZero). I doubt it has anything to do with theme itself, more likely some bug in SVG theme rendering engine in firmware.
Removed the theme and my browser is stable again.