What it is not:

• best implementation you ever saw

What is it:

• minimum implementation plugin
• gets the job of distinct highlight of active tab done (I'm personally using Darcula theme, and this has been a nightmare for me for quite a while, to see the active tab, amongst the others)
• yes, the highlight colour is somewhat pink by default, now you can change it in Settings > Tools > Active Tab Highlighter Plugin

1. From JetBrains plugin store

   • From File > Settings click Plugins from the side tree adn the click Browse repositories. Now just lookup it up by name Active Intellij Tab Highlighter

2. Manually from hard drive

   • Download the latest release jar from https://github.com/tobszarny/ActiveTabHighlighterPlugin/releases
   • In IntelliJ, go to File > Settings, click Plugins from the side tree.
   • Click Install plugin from disk and point the downloaded jar.

Plugins is provided as is, with no warranty or support whatsoever.

You can do whatever Apache Licence V2.0 allows with the repository code.