i like this feature overall, but some fonts were given LIGA features when they should have been DLIGs. I'm not sure what the best way to deal with this problem (other than hacking the fonts to disable inappropriate ligatures), but you can see what Space Mono does here out of the box
would it be possible to just specify in settings if we want to disable the ligatures or an array of specific opentype features like CALT/LIGA/DLIG to enable, but leave them all on as a default (as they seem to be pretty popular overall).
this seems to have been an issue for some time in space mono given, https://github.com/googlefonts/spacemono/pull/2/, but just wanted to point it out as there are still a handful of monos out there that were designed for print usage first and display usage second and may have overeager opentype support assuming only indesign would be able to do anything with the features.
looks smokin with fira code, though, mad props