http://gothub.nowhevi57f4lxxd6db43miewcsgtovakbh6v5f52ci7csc2yjzy5rnid.onion/tonsky/FiraCode/wiki/How-to-enable-stylistic-sets
VS Code Since version 1.40 , you can define in settings.json : "editor.fontLigatures" : " 'ss01', 'ss02', 'ss03', 'ss04', 'ss05', 'ss06', 'zero', 'onum' " To avoid possible bugs, you must uninstall Fira Code 1.x before installing Fira Code 2+.