ports/175421: workaround: www/firefox is MAKE_JOBS_SAFE but never uses more than one cpu

[flo at FreeBSD.org]

Synopsis: workaround: www/firefox is MAKE_JOBS_SAFE but never uses more than one cpu

State-Changed-From-To: open->closed
State-Changed-By: flo
State-Changed-When: Sun Jul 7 15:17:39 UTC 2013
State-Changed-Why: 
According to the submitter it was fixed before Firefox 21

http://www.freebsd.org/cgi/query-pr.cgi?pr=175421