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I foolishly changed Firefix font and dislike it but cannot find out what default font was in first place now

  • chose OLIVE OIL
  • would like to know what the default font was or
  • suggestion for another font easier to read

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You can see the defaults in a screenshot in this KB article: Some text shows up bold after upgrade
You can check the font setting in: Tools > Options > Content : Fonts & Colors: Advanced
Default Font: Times New Roman (16)

Fonts for  : Western

Proportional: Serif (16)
Serif  : Times New Roman
Sans-serif  : Arial
Monospace  : Courier New (13)