How to increase DPI on Compaq Mini 702EA (1024x600) Ubuntu 9.10

[Jon]

I'm running Ubuntu Netbook Remix 9.10 (latest) on Compaq Mini 702EA 
(1024x600). The text is very small in Firefox and the rest of the 
desktop due to the high DPI of the display panel (118dpi).

Therefore I would like to increase the DPI setting, so that 
text,icons, web pages are rendered larger.

I've been discussing on ubuntu forums, but no luck yet
http://ubuntuforums.org/showthread.php?p=8859536#post8859536

all the changes I've tried, from http://www.mozilla.org/unix/dpi.html 
and other places have not worked.

Any tips appreciated!
Cheers, Jon