• Enable inSettings →Editor →Font →Enable Font Ligatures
• SelectFira Code as "Font" underSettings →Editor →Font
• Optional extension to disable ligatures in unwanted contexts

• Enable inSettings →Editor →Font →Enable Font Ligatures
• SelectFira Code as "Primary font" underSettings →Editor →Font

Additionally, if a Color Scheme is selected:

• Enable inSettings →Editor →Color Scheme →Color Scheme Font →Enable Font Ligatures
• SelectFira Code as "Primary font" underSettings →Editor →Color Scheme →Color Scheme Font

• Enable inSettings →Editor →Color Scheme →Color Scheme Font →Enable Font Ligatures
• SelectFira Code as "Primary font" underSettings →Editor →Color Scheme →Color Scheme Font →Font

Proper support for ligatures was added in 2016.2 (incl. font compatibility & better performance).

• Enable inSettings →Editor →Colors & Fonts →Font →Enable Font Ligatures
• SelectFira Code as "Primary font" underSettings →Editor →Colors & Fonts →Font →Editor Font

NOTE: Since 2016.3 IntelliJ products come with Fira Code bundled with the editor itself. If you want the latest version of Fira Code, install it separately & restart your editor.

If you see something like that

Opencmd.exe,cd C:\Windows\Fonts and thendel every file that looks likeFiraCode-Regular_**.ttf. NB these files are invisible if you openFonts in Explorer

If the files are locked you can useUnlocker. In details you should:

• Install unlocker
• Opencmd.exe as admin (press the Windows key, typecmd and right click on the result to run it as admin)
• subst q: c:\windows\fonts, replaceq with any other letter if you already have a unit with that name
• Open unlocker from the start menu,Start Unlocker
• Select any file namedFiraCode-Regular_**.ttf from theq unit, selectDelete and pressUnlock all (you could also try simply closing the applications if you can)
• typesubst /D q: inside the command prompt to remove the new unit

Issue:https://youtrack.jetbrains.com/issue/IDEA-159901

This should work forFira Code 1.102 and IntelliJ productsv. 15 and later (IDEA, PhpStorm, PyCharm, RubyMine, WebStorm, AppCode, CLion, DataGrip):

• Createidea.properties file in the configuration directory of your IDE (seewhere you can locate your configuration directory for your product)
• Add this:

editor.enable.optional.ligatures=true

• Restart your IDE

NOTE: IDEA support of ligatures is considered experimental. E.g. scroll performance may be very slow. It has beenreported here

NOTE: There’s an issue on OS X when Fira Code Light is used instead of Regular weight by default (discussion). To work around that, do not install Light weight at all.(this is fixed in latest 16 EAP) Also, installing TTF as opposed to OTF renders better with IntelliJ on the Mac.

NOTE: For latest EAPs of JetBrains products, that file doesn’t matter without setting preference:Editor→Font→Enable Font Ligatures