colindean, If you're like me and dislike how the macOS Sonoma SF font family looks, esp. on GitHub (Enterprise), consider using this helpful CSS user style sheet with a browser extension like Stylus:
.text-mono, .blob-code-inner, .input-monospace {
font-family: "Fira Code", "Source Code Pro", "Input Mono", "Jetbrains Mono", "Liberation Mono";
}body, .markdown-body {
font-family: "Source Sans 3", "Source Sans", "Input Sans", "Open Sans", "Noto Sans";
}