I wrote this description somewhere early in 2000 and hardly updated it since that time.
Netscape 2 does not support document.images or window.focus.
Netscape 2 has a security bug: you can read out the location of frames and windows that don't come from your server. For more information on why this is a security hole, see the Frame Busting page.
Generally the Mac version is slightly less good than the Windows version. For instance, it has some problems with pop-ups. Although it does open the pop-up, it doesn't load the requested page in it.
Netescape 2 exists for Linux but I don't get it properly installed on my test computer.