1. Fira Code location https://github.com/tonsky/FiraCode/releases/download/6.2/Fira_Code_v6.2.zip

2. Using Fira Code font without ligatures and with some common variants:

calt 0 - no contextual alternatives
liga 0 - no standard ligatures
ss01 1 - alternative r
ss03 1 - alternative &
ss05 1 - alternative @
cv02 1 - alternative g
cv18 1 - alternative %

3. Mac OS : Czcionki : Typografia 
Warianty zestawów stylistycznych : 1 3 5
Warianty kontekstowe : Off
Warianty glifów: g

4. VS Code

Settings -> Text Editor -> Font Family: Fira Code, Font Size: 12, Font Ligatures = click on Edit

settings.json: 
"editor.fontLigatures": "'liga' 0,'calt' 0,'ss01','ss03','ss05','cv02'",


5. Windows Terminal

settings.json:
"profiles": 
    {
        "defaults": 
        {
            "font": 
            {
                "face": "Fira Code",
                "features": 
                {
                    "calt": 0,
                    "cv02": 1,
                    "liga": 0,
                    "ss01": 1,
                    "ss03": 1,
                    "ss05": 1
                },
                "size": 12,
                "weight": "normal"
            },
 },

6. Gnome Terminal font settings:
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
  <match>
    <test name="prgname" compare="contains">
      <string>gnome-terminal</string>
    </test>
    <edit name="fontfeatures" mode="append">
      <string>calt off</string>
      <string>clig off</string>
      <string>dlig off</string>
      <string>liga off</string>
    </edit>
  </match>
</fontconfig>