Fasteroid

/*
    Shadertoy '84 by Fasteroid
    Inspired by Robb Owen's "SynthWave '84" theme for VSCode
    Revision 2
*/
@-moz-document domain("shadertoy.com") {
:root {
    --site-gutter: #171520;
    --site-bg: #241b2f;
    --site-text: #ffffffe6;

Fasteroid

/*
    WebAssign Dark Theme by Fasteroid
    Revision 11
*/
@-moz-document url-prefix("https://www.webassign.net/web/Student") {
.mainContainerLayout {
    display: grid;
    min-height: 100%;
    grid-template-rows: auto 1fr auto;
    background: #222;

Fasteroid

/*
    Desmos Dark Theme by Fasteroid
    Revision 16
*/
@-moz-document url-prefix("https://www.desmos.com/calculator") {
.dcg-exppanel {
    background: rgb(35,35,35) !important;
}
.dcg-calculator-api-container #graph-container .dcg-container {
    font-size: 100%;