Brace yourself for the vanishing menu bar because Mozilla has published an official feature list for Firefox 3.6 in the form of a guide for programmers who need to know about the changes.

The Firefox 3.6 developer guide mentions an ability to automatically hide the menu bar, a change that dovetails with sparer Firefox user interface designs that Mozilla has begun exploring for Firefox versions 3.7 and 4.0. That's important for plug-in developers and others who use the menu bar to control their add-ons.

More: http://news.cnet.com/8301-1001_3-10299350-92.html