While I find the ability to color the tabs very convenient, the problem I have
is that it can be hard to determine which tab you are on.
In the screen shot below, you cannot easily tell which tab is related to the
editor window (is it the first tab or the forth tab?).
The only thing you can see is that the 4th tab only has a small line under it
and the first one is a little thicker. Barely noticeable.
It would help if the line that goes around the active editor tab and the editor
window were darker or more pronounced or
another way would be make the non-active tabs slightly gray or make the color
somewhat transparent out to make the active tab stand out like below.
Just my 2 cents.