Firefox ebuild lacks webm use flag [SOLVED]

[rudregues]

I was looking for firefox use flags and this site http://www.gentoo.org/dyn/use-index.xml lists a bunch of them. Including webm. But when I run the command emerge --ask firefox there's no webm use flag (set or unset...)
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Emerging en gentoo

[Naib]

open a bugreport
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#define HelloWorld int
#define Int main()
#define Return printf
#define Print return
#include <stdio>
HelloWorld Int {
Return("Hello, world!\n");
Print 0;

[rudregues]