UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36

Steps to reproduce the problem:
1. Open Chrome in incognito mode.
2. Browse the web until you find yourself having six tabs open.
3. Decide you want to go back to another tab. Try to find the active tab to tell if you need to press Alt+Tab or Shift+Alt+Tab and switch to the desired tab.

What is the expected behavior?
It is immediately obvious which tab you are on and, as a result, you press the correct keyboard shortcut to go to the desired place.

What went wrong?
You find yourself going through all of the tabs until you find what you were looking for, wasting time and getting distracted in the meantime.

Did this work before? Yes Back when the dark theme did not exist - pre-Material

Chrome version: 63.0.3239.84  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

Please increase the contrast between the color of the foreground tab and the background tabs. I recommend you to use a WCAG contrast checker to guide your picks.