Hey,
First, I love xCSS
Maybe you can implement a feture, that detect the browser and version and add the Extension to the new CSS3 Fetures, for Example
div{
border-radius: 5px;
}
Comiled for Safari:
div{
-webkit-border-radius: 5px;
}
Compiled for Mozilla:
div{
-moz-border-radius: 5px;
}
Sorry for my bad English,
I'm from Germany