Finally, I downloaded the libc5 version of Netscape Communicator, and that did the trick.

CNN: Corel Linux 1.0 is praiseworthy but flawed

Netscape Communicator 4.6: The popular free Web communications suite lets you browse and create Web pages, send e-mail, and chat.

CNN: Downloads to improve your Web experience

For more information on Smart Browsing keyword searches, content filtering, and the ability to find pages related to the ones your viewing, see the "Netscape Posts Communicator 4.5 Beta Today" and "Netscape Stabilizes Browser" links at right.

CNN: Communicator 4.5: Finally stable