Latest nightly builds of Firefox include a new customisable tab bar in the browser.
New builds allow buttons in tabs to be removed, saving valuable screen real estate for heavy tab users.
Previously this has been possible with third party add-ons, or by modifying the browsers own CSS files.
The tabs in this build also appear to be more rounded, as has been apparent in early interface mock ups for Firefox 4.
This is only the start of changes, with tab animations and aero glass still on their way for the upcoming browser.
Eager testers can view the new tab bar in action by downloading the latest nightly builds from the Mozilla FTP server.