I use FreeBSD 8.1 and I use Gnome and I use Firefox 3. Firefox always uses 50% of CPU and sometimes it uses more than 100% CPU and I can't use another application. But I install PC-BSD in virtualbox and install Firefox 3.6 and Firefox do not use more CPU and work better than Firefox I installed on FreeBSD. Can this happen because of different version of Firefox or another thing? Maybe team of PC-BSD uses different configuration?