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

In C#, I found that an extension is the most helpful to create a cross-browser solution.

public static class Extensions
{
    public static void Disable(this HtmlAnchor obj)
    {
        obj.Attributes.Remove("href");
        obj.Attributes.Add("disabled", "true");
        obj.Style.Add("color", "gray");
    }
}