1146104 - 100%+ CPU usage when playing html5 audio/video on FreeBSD 10.1

Status: RESOLVED DUPLICATE of bug 1146105

(SeaMonkey :: General, defect)

Description

[mzs_47]

User Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:36.0) Gecko/20100101 Firefox/36.0 SeaMonkey/2.33
Build ID: 20150311144957

Steps to reproduce:

I played video from youtube with html5 player and audio from soundcloud.
I don't have flash installed. The machine is a two year old Core i7.

[..]
% uname -a
FreeBSD freebsd64_10 10.1-RELEASE FreeBSD 10.1-RELEASE #0 r274401: Tue Nov 11 21:02:49 UTC 2014     [e-mail]:/usr/obj/usr/src/sys/GENERIC  amd64
[..]

[..]
pkg info seamonkey
seamonkey-2.33
Name           : seamonkey
Version        : 2.33
Installed on   : Sun Mar 15 19:59:07 IST 2015
Origin         : www/seamonkey
Architecture   : freebsd:10:x86:64
Prefix         : /usr/local
Categories     : www news mail irc ipv6 editors
Licenses       : 
Maintainer     : [e-mail]
WWW            : http://www.mozilla.org/projects/seamonkey/
Comment        : The open source, standards compliant web browser
[..]


Actual results:

CPU usage is 100%++
Copying top command output.

THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAND
   57  20    0   762M   409M uwait   4  10:00 100.29% seamonkey



Expected results:

Midori(based on chromium) consumes around 15%(360p) and 24%(720p) for youtube.
100% is just too much.