Enable HEVC/H.265 in Firefox

about:config media.wmf.allow-unsupported-resolutionsmedia.wmf.force.allow-p010-formatmedia.wmf.media-engine.channel-decoder.enabledmedia.wmf.media-engine.enabled All set to “True” except the last one, which is set to “1” (Source)

CSS Font Fallbacks

–font-sans-serif: system-ui, -apple-system, “Segoe UI”, Roboto, “Helvetica Neue”, “Noto Sans”, “Liberation Sans”, Arial, sans-serif, “Apple Color Emoji”, “Segoe UI Emoji”, “Segoe UI Symbol”, “Noto Color Emoji”; –font-monospace: SFMono-Regular, Menlo, Monaco, Consolas, “Liberation Mono”, “Courier New”, monospace; Source: Bootstrap 5.3