What are some of your Linux desktop preferences and workflow improvements?

I use Mutate for app launching, DDG searches, and a dozen or so scripts I wrote myself.

I like different URLs to open in specific browsers, so I wrote a script called xhttp that determines which browser to open with URL regexes, and used freedesktop to register it as a browser, and set it as my default.

Anything fun you've done?

Since I used to switch a lot between my USB headphones and speakers, I wrote a wrapper for pactl, to instruct pulseaudio which devices to use with a simple launcher command. Hitting alt-space brings up the mutate window(just like cmd-space brings up alfred on my work mac) and I type "pa." It lists the audio streams that are open, and for each a selectable list of devices to switch the stream to. It's really handy for me.