any way to make Firefox 3.5's tabs behave like 3.0's?

[hyperkine]

So let's say I have two Firefox windows open, one on the left with two tabs, one on the right with a single blank page. Also, Firefox is set to display the tab bar only when there's more than one tab open in a window.

With 3.0, if I drag a tab from the left window to the right, it'll open in the right window. With 3.5, if I do the same thing, the dragged tab opens in a new, third window.

Is there any way to make 3.5 behave like 3.0, without enabling the "always display tab bar" option in 3.5? Add-on, registry change, about:config tweak, whatever.

Thanks