You need to explicitly enable ligatures support in following editors:
For other editors it should be enough to simply select Fira Code as your font of choice. Full list of compatible editors
Home CN Installing CN
Enabling: Atom | VS Code | IntelliJ | BBEdit | Brackets | Emacs | GoormIDE | Cloud9 | MacVim | Notepad++ | RStudio | Sublime Text | Visual Studio | MATLAB
Troubleshooting Stylistic sets Language Coverage
OSes/Tools: Linux | Chrome devtools | LaTeX | Chrome OS terminal
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