I'm trying to reduce a bit the occurences of me writing in the wrong channel on irc. So I was looking at how to highlight the active window in irssi.

And indeed there is a solution: https://github.com/irssi/irssi/issues/244 ... adding something like sb_window_bg = "%k%6"; to the theme in the abstracts section will do the trick: The status bar of the "active" window will be cyan (%6) with black text (%k). Color codes can be found here: https://irssi.org/documentation/settings/#a_d (not a lot of choices).

To see the changes while irssi is running, you can use a quick /reload nameof.theme