Great addon , please add :
- mousewheel scrolling in the tabs
- color for groups of tabs (a click on a link opens a new tab in the same color of the current tab)
- Tabs counter on the top or bottom of the side bar
- smaller sidebar Title (it takes the size of almost 2 tabs)
- a tutorial on the web page of the addon to explain how to remove the native horizontal tab bar

Thanks for the work on it !