In a moment of randomness, I tried to drag a Firefox tab into Google Chrome, only to find that it worked! Just like dragging tabs into an order in firefox, or between firefox windows, you can drag them into this increasingly impressive browser. This is a one-way relationship however, as firefox will not return the favour and accept Chrome’s tabs, although it is likely that there is or will be an add on in future to do so.
It seems that Google are aware of browser-loyality for firefox users, (who were freed from the clutches of IE) and are making the transition as easy as possible