Quake3 Rocket Arena 3:

If you can't see the servers, first download Q3plug.

Then unzip  and copy to your Web browser's plug-in directory.

• For Internet Explorer, the directory is:
  c:\Program Files\Internet Explorer\Plugins\
  Then execute the .reg file that is in the zip.
   

• For Netscape Communicator, the directory is:
  c:\Program Files\Netscape\Communicator\Program\Plugins\

That's it.