Probably best described in this scribble
With thanks to How do I fix GitHub icons (octicons) on Firefox? (Oliver Salzburg's comment)
about:config
gfx.downloadable_fonts.enabled;true
Probably best described in this scribble
With thanks to How do I fix GitHub icons (octicons) on Firefox? (Oliver Salzburg's comment)
about:config
gfx.downloadable_fonts.enabled;true