1) In the Vertical Tabs Mode, the area where tabs are shown is too thick and seems to be distracting, therefore provide an option to auto hide the tab area (in vertical tab mode only) (which would then function exactly like the auto hide feature of windows taskbar) and it would only appear when courser goes to the left side of the screen.
2) There is a lot of delay (about 300 milli-seconds) which doesn't sound much but feels very slow which happens when I hover my cursor over the tab area in order to expanded it (Icon + names of site)
I have attached the Screen Shot below and you can see that even the cursor was on the tab area, I was still able to take a screenshot in the time frame that it starts moving.
