gecko-dev/browser/metro/theme/cssthrobber.css

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

%filter substitution
%include defines.inc

#container[enabled] .progressBall {
  position: absolute;
  opacity: 0;
  transform: rotate(225deg);
  animation: orbit 7.15s infinite;
}

#container[enabled] .progressBall:nth-child(1) {
  animation-delay: 1.56s;
}

#container[enabled] .progressBall:nth-child(2) {
  animation-delay: 0.31s;
}

#container[enabled] .progressBall:nth-child(3) {
  animation-delay: 0.62s;
}

#container[enabled] .progressBall:nth-child(4) {
  animation-delay: 0.94s;
}

#container[enabled] .progressBall:nth-child(5) {
  animation-delay: 1.25s;
}

#container[enabled] .progressBall:nth-child(1)::after,
#container[enabled] .progressBall:nth-child(2)::after,
#container[enabled] .progressBall:nth-child(3)::after,
#container[enabled] .progressBall:nth-child(4)::after,
#container[enabled] .progressBall:nth-child(5)::after {
  content: "";
  display: block;
  width: 5px;
  height: 5px;
  border-radius: 5px;
  position: absolute;
  background: #0095dd;
  left: 0;
  top: 0;
}


@keyframes orbit {
  0% {
    opacity: 1;
    z-index: 99;
    transform: rotate(180deg);
    animation-timing-function: ease-out;
  }

  7% {
    opacity: 1;
    transform: rotate(300deg);
    animation-timing-function: linear;
  }

  30% {
    opacity: 1;
    transform: rotate(410deg);
    animation-timing-function: ease-in-out;
  }

  39% {
    opacity: 1;
    transform: rotate(645deg);
    animation-timing-function: linear;
  }

  70% {
    opacity: 1;
    transform: rotate(770deg);
    animation-timing-function: ease-out;
  }

  75% {
    opacity: 1;
    transform: rotate(900deg);
    animation-timing-function: ease-out;
  }

  76%, 100% {
    opacity: 0;
    transform: rotate(900deg);
  }
}