As mentioned in https://blog.sarav.co/installing-fira-code-ligatures-sublime-text-3-mac-os/ . Ligature support in Sublime Text has been included since version 3156+.
Download Version Dev 3156
First go to https://www.sublimetext.com/3dev and then download the latest version of Sublime Text dev 3156 +.
NOTE Please note that dev versions are only available to a licensed user, and downloading the dev version may break something.
If you have not installed Fira Code yet, go to https://github.com/tonsky/FiraCode and download the zip from github and extract it. You will find the ttf folder in the distr folder. Copy all the files and paste them into the /Users/<username>/Library/Fonts folder.
Finally, open the installed sublime text and press cmd+, you will see Preferences.sublime-settings . Paste the following code here.
"font_face": "Fira Code", "font_options": [ "gray_antialias" ],
Here it is! Now ligatures are included in your system. Enjoy :)
Saravanan Sampathkumar
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