Change color of active terminal window I often have a bunch of terminal windows with some various tasks. My problem, however, is that I have a hard time seeing which one is on top. This leads to me often typing [arrow up] + [enter] in the wrong window, one time leading to the execution of "git reset --hard HEAD", trashing a full days work.

So, is there a way to make the inactive terminal window look more... inactive, like changing its background color or something like that?
You can add transparency and a blur effect to windows, and you can also set these values seperately for active windows vs inactive windows, making the inactive windows much more transparent for example.

You'll find these settings in Terminal.app Preferences - Settings - Window. Click the colour picker to define them.