I\'m using a dark theme in IntelliJ 14, the problem is that I have difficulties in distinguish the active tab, because its header\'s background is not different than the oth
To me, the solution turned out to be a plugin implementation:
https://github.com/tobszarny/ActiveTabHighlighterPlugin
Feel free to fork it for alteration, or use as is. Now with color customization and with IntelliJ platform IDE's support, such as PhpStorm or RubyMine.
Now also in the plugins repository, for auto update whenever new version is made.