Help VNC crash w/firefox

Hi everybody!
 I write from Argentina.

 I recently build a micro-distro that runs with i486 w/4MB ram (yes...
 just four megas).
 This micro-distro have a Xclient from a vnc-client (svncviewer).
 All apps run nice and with a good performance, but when I try to
 navigate with firefox, the vnc connection closes and the Xclient
 crashes and freeze!!!...
Server is a CentOs K12ltsp-EL5

 Here a only that I can get of /var/log/messages: (I login w/user 'educa1')

 *****************************************************************
 Apr 14 09:23:58 server xinetd[7823]: START: vnc-800x600x16 pid=8789
 from=192.168.0.100
 Apr 14 09:24:23 server gconfd (educa1-8890): comenzando (versión
 2.14.0), pid 8890 usuario «educa1»
 Apr 14 09:24:23 server gconfd (educa1-8890): Se resolvió la dirección
 «xml:readonly:/etc/gconf/gconf.xml.mandatory» a una fuente de
 configuración de sólo lectura en la posición 0
 Apr 14 09:24:23 server gconfd (educa1-8890): Se resolvió la dirección
 «xml:readwrite:/home/educa1/.gconf» a una fuente de configuración
 escribible en la posición 1
 Apr 14 09:24:23 server gconfd (educa1-8890): Se resolvió la dirección
 «xml:readonly:/etc/gconf/gconf.xml.defaults» a una fuente de
 configuración de sólo lectura en la posición 2
 Apr 14 09:24:25 server hcid[2127]: Default passkey agent (:1.525,
 /org/bluez/applet) registered
 Apr 14 09:24:25 server pcscd: winscard.c:304:SCardConnect() Reader
 E-Gate 0 0 Not Found
 Apr 14 09:24:25 server last message repeated 4 times
 Apr 14 09:24:25 server gconfd (educa1-8890): Se resolvió la dirección
 «xml:readwrite:/home/educa1/.gconf» a una fuente de configuración
 escribible en la posición 0
 Apr 14 09:25:46 server xinetd[7823]: EXIT: vnc-800x600x16 status=0
 pid=8789 duration=108(sec)
 Apr 14 09:25:53 server gconfd (educa1-8890): El servidor GConf no está
 en uso, cerrándolo.
 Apr 14 09:25:53 server gconfd (educa1-8890): Finalizando
 ********************************************************************

 As you can see, xinetd suddenly closes the vnc connection.
 When I put more ram the crash dissapear (4MB more, total=8MB), but I
 really need to use this machines (near of 1500) of 4MB ram, the
 machines are a IBM valuepoint-425SX model 6381.
 A few days ago, I can not neither open firefox (the free mem that bios
 tell me are 3072Kb, kernel 509Kb-bzipped, rootfs-290kb-gz).
 Next, I disable the ROM in RAM and I get near of 320Kb, and then I can
 navigate only in some pages, that have a few text nothing more...
 I did read that is a bug of Xorg, and I did update it, but nothing....
 I have been thinking come back to fedora 5 -4 -3 -2 -1 or RH9, and try
 to get some repos (especially non-free)
 Any can help me? or give me any idea?
 Thankyou a lot!

Alberto Castillo

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