How to change the colour of the active tab (Firefox)?

edited January 2018 in Firefox
How do I change the colour of the active tab? Is there any way to do this with Stylish?
The problem is all the tabs are white. If I go far from my screen I cannot find the active tab.
Please, help me change the tab's colour. Only of the active tab's.
Firefox 57.0.4 (latest).
P.S. The theme is white because it is NOT Default; it is Light, and because it is Light - all tabs are white. I like them white, and I would like only one of them to be dark/highlighted (to be highlighted/marked as active).
2560 x 1440 - 485K


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