fenix-fox/chrome/button_effect_scale_onhover.css

/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/button_effect_scale_onhover.css made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */

/* Effect */

.toolbarbutton-icon,
.menuitem-iconic .menu-iconic-icon{
  transition: transform 83ms linear !important;
}

toolbar .toolbarbutton-1 > .toolbarbutton-icon,
.urlbar-icon{
  transition: padding 83ms linear !important;
}
toolbarbutton#scrollbutton-up > .toolbarbutton-icon,
toolbarbutton:not(.toolbarbutton-1) > .toolbarbutton-icon,
toolbar .toolbarbutton-1 > .toolbarbutton-badge-stack > .toolbarbutton-icon,
.menuitem-iconic .menu-iconic-icon{
  transform: scale(0.8) !important;
}
toolbarbutton#scrollbutton-down > .toolbarbutton-icon{ transform: scale(-0.8) !important; }

toolbar .toolbarbutton-1 > .toolbarbutton-icon{
  padding: calc(var(--toolbarbutton-inner-padding) + 2px) !important;
}

#page-action-buttons .urlbar-icon:not(:hover){ padding: calc(var(--urlbar-icon-padding) + 2px) !important; }

toolbarbutton#scrollbutton-up:not([disabled]):hover > .toolbarbutton-icon,
toolbarbutton:not(.toolbarbutton-1):not([disabled]):hover > .toolbarbutton-icon,
toolbar .toolbarbutton-1:not([disabled]):hover > .toolbarbutton-badge-stack > .toolbarbutton-icon,
.menuitem-iconic:not([disabled]):hover .menu-iconic-icon{
  transform: none !important;
}
toolbarbutton#scrollbutton-down:not([disabled]):hover > .toolbarbutton-icon{transform: scale(-1) !important;}

toolbar .toolbarbutton-1:not([disabled]):hover > .toolbarbutton-icon{
  padding: var(--toolbarbutton-inner-padding) !important;
}