How to enable stylistic sets

Stylistic sets allow you to access additional, optional parts of the font on a per-feature basis. In Fira Code, they allow you to enable/disable alternative character variants.

Fira Code v6 supports these stylistic sets:

You can enable stylistic sets only if your editor supports it.

Atom

Go to Atom -> Stylesheet, add:

atom-text-editor {
  font-feature-settings: "ss01", "ss02", "ss03", "ss04", "ss05", "ss06", "zero", "onum";
}

iTerm2

Go to iTerm2 -> Preferences -> Advanced and scroll to the Drawing section, then change:

Improves drawing performance at the expense of disallowing alphanumeric characters to belong to ligatures. to No

Sublime Text

Go to Sublime Text -> Preferences -> Settings, add:

"font_options": ["ss01", "ss02", "ss03", "ss04", "ss05", "ss06", "ss07"]

For now Sublime Text does not allow you to specify zero and onum features.

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+.

CSS

.monaco-editor {
  font-feature-settings: "ss01", "ss02", "ss03", "ss04", "ss05", "ss06", "zero", "onum";
}

RStudio

Create or edit an rstheme file and add:

.ace_editor {
  font-feature-settings: "ss01", "ss02", "ss03", "ss04", "ss05", "ss06", "zero", "onum";
}

Kitty

Select which font variant you wish to use (Regular, Medium, Light, ...) and set that as your font on the kitty's config file (~/.config/kitty/kitty.conf), for instance:

font_family      Fira Code Regular

Then fetch the PS Name (the value between parenthesis) of the chosen font variant using kitty:

$ kitty + list-fonts --psnames | grep "Fira Code Regular"
    Fira Code Regular (FiraCode-Regular)

Finally use the PS Name setting the following key in the kitty.conf file:

font_features FiraCode-Regular +ss01 +ss02 +ss03 +ss04 +ss05 +ss07 +ss08 +zero +onum

Wez’s terminal

return {
  harfbuzz_features = {"zero" , "ss01", "cv05"}
}

Full instruction here.

Windows Terminal

Open the Windows Terminal settings.json file. You will need to insert a font object for Fira Code in one or more profiles:

An example font object:

    "font": {
        "face": "Fira Code",
        "features": {
            "ss01": 1,
            "ss02": 1,
            "ss03": 1,
            "ss04": 1,
            "ss05": 1,
            "ss06": 1,
            "zero": 1,
            "onum": 1
        }
    }