With the tab coloring feature, it can be difficult to tell which tab is the currently active tab just by looking at them. Some of the colors of the disabled tabs come through as slightly different than when they are active, but look like they might be active because they are close to other colors.

I would suggest either making all inactive tabs gray, or to introduce some other type of visual queue to help easily distinguish active from inactive tabs.

I can't upload a screenshot here but I do have one as an example.