Why Tabs are on Top in Firefox 4 [YouTube]

I love UI (user interface) design topics.  I bought in to the whole tabs-on-top thing before, but watching this really solidifies my opinion.

Even if you disagree, it is still a very interesting look into some of the thinking that goes into many of the software design decisions that largely go unnoticed (as it should be).

YouTube - Why Tabs are on Top in Firefox 4