When you scroll the mouse wheel over the tab bar in Firefox you see the tab titles pass by so you can select the tab you want, which is not always that easy if titles are similar like when having several pages from the same site open at a time.

With Tab Wheel Scroll, a Firefox extension developed by Matt H, the mouse wheel actually switches tabs so you can see the full tab contents as you scroll up and down which you can configure to scroll tabs to the left or to the right.

You can also set whether you want to continue with the first or last tab when you have reached the opposite edge so scrolling keeps going. This sounded as a good option at first but turning it off actually made it more usable for me.

Bonus points for not adding any unnecessary user interface other than its options accessible from the Add-ons Manager, and being already compatible with Firefox 3 betas and nightlies.

An option (like Ctrl + scroll) for simple tab title scrolling would be welcomed.

Tab Wheel Scroll is available from Mozilla Add-ons experimental area, so you will need to log in to install it.