Firefox with no sound

[Elton Luis Grandolpho]

Hi,

I am using Firefox and Chromium in my computer.

Sound works fine using Chromium(last version), but does not work with Firefox(last version) using youtube , for example.

uname -a
FreeBSD FX6100ASUS 10.3-RELEASE FreeBSD 10.3-RELEASE #0 r297264: Fri Mar 25 02:10:02 UTC 2016     root at releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64

$ ident /usr/ports/www/firefox/Makefile
/usr/ports/www/firefox/Makefile:
     $FreeBSD: tags/RELEASE_10_3_0/www/firefox/Makefile 410638 2016-03-08 18:19:56Z jbeich $

Could you check, please?

If you have any questions, please let me know

Best regards

Elton Luis Grandolpho