Icecat 7.0.1 shuts down unexpected very often

[user1]

I am using ubuntu 10.10 32 bit
Icecat 7.0.1 shuts down unexpected VERY often
The reason I am using icecat is that firefox also shuts down unexpected 
all the time, this has happened for over a year.
When I am doing some serious work like buying something on the internet 
or working with facebook I always switch to google chrome.
The main reason I am using icecat is because I am using scrapbook which I 
find indispensable.
Google Chrome has something alike scrapbook but not so good I find