All the tabs seem to be the same color in Chrome; so I can’t quickly find the active tab, if I want to close it, for example. Is there any way to make that tab stand out? Is there an extension or a different window border? I’m using Mate Black, but I’ve tried loads of others without luck. Even high contrast themes have no contrast when it comes to tabs. 
Never mind. I installed the Morpheon Theme from the Webstore. Now I can distinguish it.