Please hel me, i'm going crazy!
I've crerated a simple circle with gradient color and saved it as svg file...

At this point i want to set it as a mask of ani image.. This is the code

<img id="immy" src="">

and this the css rule
PHP Code:
webkit-mask-imageurl(cerchio.svg); /*chrome*/
maskurl(cerchio.svg#cer);  /*firefox*/

the mask works fine in chrome, but it dont make any result in firefox, where the image simply isn't showed (such if the mask hide it completely)