userContent.css

/* vim: set noai ts=4 sw=4: */
:root {
    -moz-tab-size: 4;
    tab-size: 4;
}

code, kbd, pre {
    font-variant-ligatures: none;
}

input:not(.urlbar-input):not(.textbox-input):not(.form-control):not([type="checkbox"]):not([type="radio"]),
select,
textarea {
    -moz-appearance: none !important;
    appearance: none !important;
    background-color: #fff;
    color: #222;
}

:root:lang(th),
:root:lang(lo) {
    font-size: 1.1rem;
}

@-moz-document domain("github.com") {
    .highlight, .blob-code-inner, pre, code, kbd {
        font-family: monospace !important;
        font-variant-ligatures: none !important;
    }
}

@-moz-document domain("gitlab.com") {
    body.gl-dark {
        background-color: #111;
    }
}

@-moz-document domain("trello.com") {
    #trello-root.body-dark-board-background {
        background: #131217 !important;
    }
}

@-moz-document domain("cybre.space") {
    .media-gallery__item-thumbnail img {
        object-fit: scale-down !important;
    }
}

@-moz-document domain("slack.com") {
    .sk-client-theme--dark {
        --sk_foreground: hsl(184.6, 11.3%, 77.5%);
        --color-text-2: hsl(184.6, 11.3%, 56%);
        --sk_primary_background: hsl(252, 12.2%, 8%);
        --color-bg-hover: hsl(252, 12.2%, 12%);
        --color-bg-code: hsl(252, 12.2%, 16%);
        --color-link: hsl(205.1, 55.3%, 50%);
        --color-link-hover: hsl(230, 64.7%, 60%);
        --color-secondary: #955ae7;
    }
}