Firefox 2.0: Disable Tab Scrolling
Contributed by MickeyMouse 
Tagged: Mozilla Firefox When you open up a zillion tabs in the new version of firefox, arrows form on each side of the tab strip to allow you to scroll to show more tabs. You can disable this by editing the firefox configuration.
If you like to keep shrinking your tabs like the old version of firefox, just disable the new scroll feature:
1. Open Firefox 2.0
2. In the address bar enter: about:config
3. Double-click on browser.tabs.tabMinWidth and change the value to 0
You may also like -
Firefox 3.6: Enable Visual Previews When Using Ctrl+Tab (Windows Only)
Firefox: Have New Tabs Open to Home (or any other) Page
Firefox 2.0: Disable 3rd Party Cookies
Firefox: Show tabs preview in Windows 7 taskbar
Firefox 8: Load tabs on demand
Firefox 4: Disable Tab Animation
IE7: Open Pop-Ups in Tabs
OS X: Install and Run Firefox 3 and Firefox 4 on the Same Computer