Xfire has today released an update to their gaiming instant messanger. Inside the update is the abbility to browse the web in tabbed windows while you are still in game.
The browser uses an imbedded version of Internet Explorer, and is not using a new brower engine.
In game support is not available on all games, but the list of games is increasing.
Users of Xfire will have the new version pushed out to them while new users can downoad Xfire from the Xfire website.