Sometimes when working on multiple projects or browsing multiple related topics it can be confusing as to which tab is which and what one of the many tabs were used for. I propose that color selection per tab widget be added as a means of solving the issue, just enter rgb/hex value or select a pre-designed color and it'll change the color of the tab. I've quickly thrown together a quick reference for what one might look like (minus the fact that it's just a low opacity square with a few color swaps)