Why are linkbuttons not grayed out when disabled in FireFox?

Question

Why when I set enabled=false on a button does it not render correctly in Firefox? Instead of graying out the link it is still blue.

[UPDATE]

ASP.net already rem

Answer 1

When you disable a button it adds "aspNetDisabled" class to the button. so you can easily set the "aspNetDisabled" class with whatever you want.

 .aspNetDisabled {
        color: black;
        background-color: #e3e3e3;
        text-decoration: none;
    }