Netscape 4.8/4.7xxx crashes are a bug of Netscape that wasn't corrected and there are no more updates for 4.xxxx. Netscape 6.xx is very slow, so I don't use it. I don't know the reasons of the crashes, but they are related to some link in the pages that doesn't respond. Try to clear the cache, sometime it helps, or try to access some time later. Anyway Netscape 4.xx is much better and powerful than IE.

Stupidity also evolves!