[insidious]

I've actually always wanted to do this, but never knew how. Care to enlighten me?
I'd probably go through my scenic pictures folder and plaster them to the background of sites I go to often, kind of like you did.

I'm going to assume OP is using Stylish https://addons.mozilla.org/en-US/firefox/addon/stylish/ and making custom UserStyles

Also, Really liking Maddison's style. Might spend the next few hours making a custom style now tbh.