Good news for Firefox users who have lusted over Chrome and Safari's option that lets you "tear" away tabs from an open window. The latest build of 3.1 offers it as a standard feature--and it works marvelously.
As in Google's Chrome and Apple's Safari browsers you simply pull away a tab from the interface and it turns into its own window. Likewise you can drag it back into an already opened window, just like you'd do to re-order your existing tabs.
Below is a quick video demo of how the new tear-away feature works, both with dragging tabs and choosing to open them via contextual menu.