It looks like a release today changed the default font to New Times Roman:
Looking deeper, it looks like this CSS variable is to blame, at least in Firefox '
appears to invalidate the font-family rule, defaulting to the browser default of serif
(aka, New Times Roman).
:root {
--font-main: system-ui, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
--search-result-gap: 24px;
}