It’s 2026 and I still run dwm on my laptop. I think at some point I’ll need to switch to another minimal tiling window manager running on Wayland.

Anyway, I want to share an easy way to enable dark mode on Firefox running on dwm without installing any additional plugins by using the about:config method.

  1. Type about:config in the address bar
  2. Search for ui.systemUsesDarkTheme, and set it to 1

Reference: