JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="hidmeinfirefox">I should be hidden in firefox</div>
</div>

CSS

.container {
    
}
.container .hidmeinfirefox {
    height: 1px;
    width: 1px;
    -moz-overflow: hidden;
}