Are you aware the tab history is available after right-clicking on the back button?
Yes, but I think the tabs functionality is under utilized the way it is now. The preview thumbnails are too small to be of any use visually, and to me to include back and forward tab history would be more useful, and having to right click on back button then forward button is Ok but could be easier.
In fact, I have already edited both the tab menu and document menu to include back and forward history. Of course document menu is easier as there is less aiming required, but in both cases the tab has to be in focus. Hover would be easier and more productive