Thread: Mozilla Firefox Crashing frequently ?

definitely memory related, not to over simplify but it is an allocation issue firefox is trying to access memory it believes is free but the pointer has it allocated and possibly in use else where

a couple of suggestion if you do a google search for firefox segmentation fault but as you mentioned you are running kubuntu here is how one kubuntu user solved it Firefox Segmentation fault - Ubuntu Forums

other basic suggestions is to try loading FF without any add ons as well, and updating flash to newest version

and finally if you have an ASUS Eee pc this may help Firefox Segmentation fault - Ubuntu Forums