ng-hide animation broken in firefox

[ludbek]

I am using animate.css. I have following styles for animating a div with ng-hide.

.slide-down.ng-hide-remove {
    -webkit-animation: fadeInDown 0.5s;
    -moz-animation: fadeInDown 0.5s;
    -o-animation: fadeInDown 0.5s;
    animation: fadeInDown 0.5s;
}

.slide-down.ng-hide-add {
    -webkit-animation: fadeOutUp 0.5s;
    -moz-animation: fadeOutUp 0.5s;
    -o-animation: fadeOutUp 0.5s;
    animation: fadeOutUp 0.5s;
}

Unlike in chrome, .slide-down.ng-hide-add does not work in firefox while .slide-down.ng-hide-remove works fine.

_You can see it here._

Is there anything I am missing to make it work?

Update

I am using angularjs 1.3.9 and firefox 35.