A customized version of Fira Code with some non-default stylistic sets baked-in
I never liked the funky r or ampersand & of default Fira Code stylistic set. FiraCode 2 introduced alternative stylistic sets to address this problem. Unfortunately, many editors don't support them. Hence, Fira Source Mono was born with my favorite stylistic sets (ss01 (sans-serif lowercase r), ss03 (traditional ampersand), ss19 (dotted zero)) baked-in.
The TRACEBACK has instructions and scripts that I used to generate these fonts.