@phoenix-plugin-registry/firacode-in-brackets/main.js

A simple extension that changes the Brackets UI fonts to Fira Code.

define(function (require, exports, module) {
    "use strict";

    var ExtensionUtils = brackets.getModule("utils/ExtensionUtils");

    ExtensionUtils.addEmbeddedStyleSheet(".CodeMirror{text-rendering: optimizeLegibility;font-family:'Fira Code'!important;}");
});