Firefox does make fonts differently on Linux / Ubuntu , as there are no Microsoft TrueType fonts, and the default font settings are different. Try installing Microsoft TrueType fonts (Arial, Trebuchet MS) with
sudo apt-get install ttf-mscorefonts-installer
Then configure the font options in Firefox, i.e. open Firefox, select
Edit >> Preferences >> Content >> Fonts & Colors - Advanced
The ubuntu font settings are described below and work for me:
Fonts for: Western
Proportional: Serif, Size 16
Serif: Times New Roman
Sans-serif: Arial
Monospace: Courier New, Size 12
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