CSS3 animation and background-image in Firefox -

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i have bit of css3 animation in website, , works fine on safari when run site in firefox, doesn't animate. here code:

.ad{ position:relative; left:740px; top:240px; width:260px; height:195px; background-image:url('ad1.png');  animation:myfirst 4s;   -webkit-animation:myfirst 4s; /* safari , chrome */ -webkit-animation-delay:2s; -webkit-animation-duration:0s; -webkit-animation-fill-mode: forwards; }  @keyframes myfirst    {   {background-image:url('ad1.png')}   {background-image:url('ad2.png')}   }   @-webkit-keyframes myfirst /* safari , chrome */  {   {background-image:url('ad1.png');}   {background-image:url('ad2.png');}  } }

now i've noticed issue arises when site hits 

 background-image:url('');

if change these 

 background:color;

then works, want use image. i've tried adding -moz- prefixes, doesn't work. missing? there way make firefox acknowledge 

background-image:url('')

the ability interpolate between background images pretty new proposal far, , not supported in browsers. firefox doesn't implement yet.


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