What kind of keyboard macros do you set up?

Title, but I’m curious and looking for inspiration.

Do you do something simple like start Firefox?

Nothing for me. If I need shortcuts I code them into my editor or bash shell aliases or functions.

Keyboard macros just seem sort of silly.

Oh yeah, and in Windows and in Gnome Shell, the Favorites / Quick Launch are shortcuts with Win+1, Win+2, etc. So I launch Firefox with Win+1 and Thunderbird with Win+2