jsMath
(type fonts)

 

Click on the jsMath floating button or ALT-click on a mathematical expression to get this dialog at any time.
jsMath Options [help]

Scale all mathematics to %
Use native TeX fonts (download)
Use image fonts ( scalable)
Use images for symbols only
Use native Unicode fonts
Autoselect best font
Use image alpha channels
Show font warnings
Show jsMath button
Save settings for