So why don't you go get the source rpm and recompile it for whatever version you're running?

People seem to think that using RPM means you can't recompile from source. This is incorrect. Just get netscape-x.x.x-src.rpm and rebuild it:

rpm --rebuild netscape-x.x.x-src.rpm

This will give you the binary rpm that you can install on your system, compiled with your dependencies.