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.
While not a ground-breaking feature, tab tearing is a large step forward in changing the way we interact with our browsers. It's a cross between the idea of having multiple tabs and multiple windows, but does not relegate the user to being pigeonholed in either one permanently.
Below is a quick demo of how the new tear-away feature works, both with dragging tabs and choosing to open them via contextual menu.