CSS Hacks Targeting Firefox

_FF.scss

// FF+ Scss styles go here
@-moz-document url-prefix() {

  body::before {
    @include border-radius(3px);
    content: 'According to the media query hack this is FF+';
    display: block;
    padding: 10px;
    position: absolute;
    top: 10px;
    left: 15px;
    font-size: em(26, 16);
    line-height: 1.4;
    color: $white;
    background-color: $flush-mahogany;
    z-index: 9999;
  }
}

// https://css-tricks.com/snippets/css/css-hacks-targeting-firefox/
// ========================================================================= */
// Firefox All
@-moz-document url-prefix() { 
  .selector {
     color:lime;
  }
}

// Firefox 3
html>/**/body .selector, x:-moz-any-link, x:default {
  color:lime;
}

// Firefox 2
html>/**/body .selector, x:-moz-any-link {
  color:lime;
}