In a recent Firefox on Windows there's no text visible. None at all. As if its color was set to 'transparent'.

The culprit appears to be "Atkinson-Hyperlegible" in font-family. If it is commented out, text becomes visible. The TTF [1] is recognized and rendered by Windows Font Viewer just fine (though in a dear need of hinting), though I'm not sure if Firefox uses Windows native font rendering engine or has its own.

[1] https://nomadvisa.io/_nuxt/fonts/Atkinson-Hyperlegible-Regul...