JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#">I am a red box in FF alone</a>

CSS

a {
    display:block;
    height:100px;
    width:200px;
    text-align:center;
    line-height:100px;
    background-color:blue;
}

body:not(:-moz-handler-blocked) a { background-color: red; }