In the downloaded TTF folder:

1. Select all font files
2. Right click and select Open (alternatively Open With Font Book)
3. Select "Install Font"

or

• Use brew and cask:

  Not officially supported, might install outdated version

  brew install font-fira-code

• Install a package available for your distribution following the instructions

or

• In the ttf folder double-click each font file and click “Install font”; see “Manual Installation” if double-clicking doesn't work

• Using pkg(8): pkg install firacode

or

• Using ports: cd /usr/ports/x11-fonts/firacode && make install clean

• Download the latest font zip file Fira_Code_v6.2.zip
• Windows 10: unzip it into real folder
• Windows 10: "Unblock" each font file before installing (Right-click each font file -> Properties -> check Unblock next to Security at the bottom of the General tab -> Click OK) Note: Skipping this step may cause the Fira Code fonts to intermittently stop working in VS Code, even though the fonts still appear in other programs.
• In the ttf folder, double-click each font file, click “Install font”; to install all at once, select all files, right-click, and choose “Install”

or

• Use chocolatey: choco install firacode

• Use scoop:

  Run as administrator

  scoop bucket add nerd-fonts
  scoop install firacode