Hi there, the changes in the theme were a mistake on my part while attempting to add support for the upcoming vertical tabs in firefox.

I've fixed the issue, but the color for the active tab had to be changed due to firefox not providing an API to change vertical toolbar's colors separately. so if the active tab color stayed the same as the toolbar's, the theme would be unusable for people using vertical tabs.

I've provided a "classic" version which is the previous version which does not support vertical tabs so that it can keep the same active tab color.