Looks like what I needed! but it does take away some built-in functionalities..
Like exchanging tabs, aka the ability to drag tabs "out" to a new or different window.
Right click -> close tabs below\above.
Drag text, links or other "objects" into or beside existing tabs to open new (or that existing) tab and search the item for ex.
In short, it doesn't act like FireFox's default tab system yet.
It also collides with other tabs that happen to reside on the same side like the history tab.
While I did gained more real-estate, my productivity were impacted..

1-Pinned tabs looks half cutted.
2-There is no tabs scrollbar
3-There is no search box