I don't know about all of you, but I HATED the new tab "features" -- that included a close button on every tab, and the "tab strip" that appeared if you had too many tabs open. After searching around, I found these changes. When implemented, you should be back to enjoying 1.x style tabs.
Go to "about:config" in your address bar and change "browser.tabs.closeButtons" to whatever tabbing style you like by using the relevant integer values from below.
0 - Display a close button on the active tab only
1 - Display close buttons on all tabs
2 - Don’t display any close buttons
3 - Display a single close button at the end of the tab strip (Firefox 1.x behavior)
Next, change:
browser.tabs.tabClipWidth to 30 (default was 140)
browser.tabs.tabMinWidth to 30 (default was 100)
And then I restarted my brower.
The "tab strip" (as it is known), now doesn't appear until I have more than 24 windows open!