Firefox 3.1 is getting a new feature called “tab tearing”.
What is “tab tearing”:
You drag and drop a tab outside of the browser window. And then “magically” the tab is removed from the current window, and is opened in a new window.
This feature has been implemented on Google Chrome, however it was planned for Firefox several times in the past. I guess that the browser competition is good for everyone.
The following clip is showing how it works: