Just updated to Firefox 114 from version 113 on Fedora 37 and spotted difference in the font rendering using the old profile. On Firefox 114, the fonts are larger. I could not make it the same as in Firefox 113, despite all the configuration in the profile is the same. Downgrading to Firefox 113 return the previous font size/rendering. However, in Firefox 114 there's a font difference even between my old profile and fresh new profile. The font configuration in the settings is exactly the same between these two profiles (default profile, Latin and Cyrillic — the same font families, sizes, checkboxes, i've even checked about:config options searching by "font" — all the same). Check the screenshots.