Way too large/small font in several webites

[P97I]

Binary package hint: firefox-3.0

1. Ubuntu - Hardy Heron, 8.04.2
2. Firefox: Installed: 3.0.8+nobinonly-0ubuntu0.8.04.2
3. Expected to have a NORMAL view/fonts in the website.
4. Got abnormally huge fonts in the site. Ctrl- mames all too. Looked for solution several hours, no results - looks like I'm not the only one. Might be problem especially with those who have Nvidia graphic card.
Not all websites, but many. Screenshot attached.

ProblemType: Bug
Architecture: i386
Date: Sat Mar 28 10:54:27 2009
DistroRelease: Ubuntu 8.04
NonfreeKernelModules: nvidia
Package: firefox-3.0 3.0.8+nobinonly-0ubuntu0.8.04.2
PackageArchitecture: i386
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=lv_LV.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.24-23-generic i686