Firefox 3.1 may well be remembered as the “tab release”, as tabbed browsing will be the most noticeable updated area users will face when it comes out in final form.

The latest Firefox 3.1 nightly (code named Shiretoko) features a new tab button in the tab bar, making the addition of a tab fully discoverable for the first time as it is now part of the primary UI.

A previous change, added a few days ago, made the tab bar always visible by default which allows the new tab button to be present at all times. In the past, the tab bar was hidden when there was only one page opened. A preference in Options/Tabs allowed to make it visible at all times.

The old New Tab button which was present in the Customize Toolbar dialog and could be added to the toolbars is gone at this time.

Yet another change in behavior now makes the current window go away when its last tab is closed. There is already a number of users complaining about this behavior and I also at first thought it would be annoying, but I still haven’t been in the situation of closing all tabs, yet wanting to keep Firefox open.

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