It's instanely stupid to do this because you have some weird usage pattern? Why should Firefox be made for you specifically, and not for as many people as possible?
If using the space that is available to me and not clunking up the browser with toolbars that I don't need or use is weird to you, then I don't know what isn't. Can you share?
Everytime they click a link in an email program it opens another tab.
And if tab browsing is off, they'll have a cluttered workspace because every link will open in a new window.
Think of the big picture
Aza Raskin, the head of user experience at Mozilla Labs, has already blogged on the possibility of moving tabs down the side of the browser, with tabs grouped by the type of activity involved (i.e. applications, work spaces).
Insanely stupid IMO! I personally because I want browser space, totally remove every toolbar - including the tab bar (scroll through them with Ctrl-Tab in Opera) - and now some idiots want to waste more space.
I don't want a 'Safari look' on my browser, I just want it to be functional and work the way I want. What turns me on is the fact that I can open more than 10 tabs freely on a PC with 512 megs of RAM and not be hogged.
Sadly, more and more people turn on to other browsers because of their pimped looks (IE) only later to find out that they're peace of crap in the features included.
Saliva causes cancer, but only if swallowed in small amounts over a long period of time. -- George Carlin