Use Mousewheel for Tab Bar Scrolling

[brosasaki]

Please describe the UI issue:
It is easy to fill the small tab bar space with websites, and it seems to become useless until you realize that you can scroll the tab bar. However, you can only do it if you have a horizontal mousewheel (or maybe touchpad?), which not everyone has.

Describe the solution you'd like
Ideally, the tab bar would have an animated scroll to the website you're visiting, and you would be able to scroll the bar manually using just your vertical mousewheel. You'd also be able to resize the main bar by clicking and dragging on the dividers between the address, tab, and mode areas.

Describe alternatives you've considered
Just being able to scroll the bar with a vertical scroll wheel would be sufficient.

[aadcg]

You can hold the Shift key to scroll horizontally.