Re: [ft-devel] rendering mode of Firefox on Windows 10

[Nikolaus Waxweiler]

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.