I find it amusing that Microsoft brags about innovating, and yet they are following the lead of Mozilla, Opera, etc. and adding tabbed browsing (supposedly in IE 7.0 next year or the year after).
I could not live without tabbed browsing.
The option of having a fully loaded browser, bare-bones version, or anything in between, is what makes Firefox so appealing. Tabbed browsing -- excellent for so many reasons, especially for use here on FR. I read somewhere that Firefox version 0.9 would be released very soon. Since the 0.8 version is running so smoothly for me, I'll probably just wait until 1.0 comes out later this year.