CSS with Webfonts doesn't allow pseudo elements

If you whan to use FontAwesome 5 in pseudo elements, for example in a CSS like:

ul > li::before {
  font-family: "Font Awesome 5 Regular";
  content: "\f0da";
}

You need to enable pseudo elements because is disabled by default:

window.FontAwesomeConfig.searchPseudoElements = true;

Ideally we can add a new checkbox in settings to enable pseudo-elements (admin/config/content/fontawesome).