I did not mean that security updates were not important. FF2 is still supported atm. If it happens to become unsupported, no problem, I'll upgrade to FF3 and adapt to the changes, good or bad.
I used live by the motto, "If its broken fix it, if it works breaks it." But that was when I didn't have real work to do --- at least not that important or computer dependent work. Now I live by "if its working, don't break it, if its broken (I consider something with a security hole to be broken), try to fix it without turning the entire system upside down".