You can customize some of the font settings in Wavebox. Here's how:

  1. Click on the 'Settings' cog in the sidebar.
  2. Click on 'Advanced' in the settings sidebar (near the bottom)
  3. Click on 'More Browser Settings'
  4. Look for the heading 'Appearance'.  There are a few settings here.  Or, click on 'Customise Fonts' to get to further settings.