Ok, if you run a MAC and are tired of pop unders like the ones from streammate.com or livejasmin.com etc... here is how to terminated them from all browsers on your computer forever. Seriously, it will speed up your browsing more that you could imagine, especially if your hunting tubes etc for your content being ripped off...
Goto Applications/Utilities/ and open Terminal.app
Type
sudo nano /etc/hosts
it will ask you for your password since this is a system file....
Add the following to the file
127.0.0.1 streammate.com
127.0.0.1
http://creatives.livejasmin.com
Add any other sites you want to block from your computer in the same fashion.
Do a Control-o and Return to save.
Test... streammate and livejamin popunders should now be gone. in all browsers on your computer for good.
On a side note, just keep the Host file open on your desktop, add to it any other annoying damn pop under or anything else you find to be a pain in the ass as you go... just remember to do the Control-O and Return after each to save the changes and block whatever for good.