Fire caught FireFox 1.5

I really like firefox, the fact is that since I got FF I actually never used IE in-fact, I don’t even remember that I ever had IE on my sys. However, version 1.5 has been blowing out, at least twice a day; FF 1.5 is not worth upgrade; certainly little has changed since 1.07, other than a few extensions. I observe that I often crash when I lock my broadband connection using firewall. Maybe some kind of ad server delay/crash is to blame… If any others experiencing similar problem or find the reason worth sharing please post a comment