Firefox defaults to GDI-style rendering for a handful of TrueType fonts.
The first thing I do when I set up a new Firefox instance on Windows or
fiddling with other people's computers when they aren't looking is setting
gfx.font_rendering.cleartype_params.force_gdi_classic_for_families = ""
Meaning, to an empty list. That triggers DirectWrite-style rendering for
all fonts. Maybe that's what you stumbled over? Or did you test
rasterinfo.html in Browserstack? Firefox Developer Edition on my Windows
10 installation shows bytecode interpreter version 40.
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