I have compared the look of the current stable Moodle 1.9+ in the browsers Firefox, Konqueror and Opera running in Ubuntu Intrepid. The installation is set to the default theme.
Fig. 1: Moodle site front page in Firefox 3.0.7
Fig. 2: Moodle site front page in Konqueror 4.1.2
Fig. 3: Moodle site front page in Opera 9.5
Fig 4: Course front page in Firefox
Fig. 5: Course front page in Konqueror
Fig. 6: Course front page in Opera
I don't see much difference. Perhaps if they were running under a different operating system with different default fonts, the difference in look will be more pronounced.
You can install Firefox and Konqueror in Ubuntu by using synaptic or opening a terminal and typing:
apt-get install firefox konquerorFor Opera, get the .deb file here: http://www.opera.com/download/?custom=yes. Install with Gdebi or go to the folder where you have the deb file and type:
sudo dpkg -i opera_9.64.2480.gcc4.qt3_amd64.deb