Popups open in both the SSB and my system browser!

When using a site-specific browser and opening a new link leading out of the site, I usually get a popup window in the SSB and another in my system's default browser (Flock in my case).

I like the behavior of a SSB launching a new tab in my main browser, but the extra popup for the SSB is annoying.

It would also be cool if the right-click menu let the user choose where a link should be opened (in a new tab in the SSB, or in the system browser).