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.

If you’re feeling brave you can download the latest development build of 3.1 here. This also comes with some nice JavaScript speed improvements and a new look for Windows Vista users.