angular1.3 里的动画在火狐下失效？

Question

我在火狐32可以但是33不行了，1.2可以但1.3不行

<div class="item" ng-repeat="item in items" ng-show="$index == selectedItem" >
  Item: {{item}}
</div>

.item {
  position:absolute;
  top:50px;
  left:200px;
  border:solid 1px black;
  padding:10px;
  background-color:#f5f5f5;
  width:100px;
}

.item.ng-hide-add {
  -webkit-animation: fadeInLeft 1.5s;
  animation: fadeInLeft 1.5s; 
}

.item.ng-hide-remove {
  -webkit-animation: fadeOutRight 1.5s;
  animation: fadeOutRight 1.5s; 
}