I've been forcing myself to use Chromium recently - it seems much faster and less bloated than Firefox, but it still lacks some features that I really would rather not do without - namely, a vertical tab bar and icons only on the bookmarks bar. Most other things can be got round more or less, and I do love the way you can add and remove extensions on the fly.

So far I'm running with:

• AdThwart
• Extensions Button
• FlashBlock
• Font Size Increase and Font Size Decrease (to do text only zoom)
• MK Undo Close Tab
• XMarks Bookmarks Sync

Vertical tabs are in development apparently...