userContent.css

/* 
 * userContent.css
 *
 * Gnome3 "dark" themes do not translate well in Firefox. 
 *
 * Copyright (C) 2018 Steven Bakker
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTAILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

:root {
    --default-fg-color: #efefef;
    --default-bg-color: #333333;
}

/*
 * HTTP and FILE documents
 */
@-moz-document url-prefix("http"),
url-prefix("file"),
url-prefix("moz-extension") {
    body {
        color: var(--default-bg-color);
        background: var(--default-fg-color);
        background-color: var(--default-fg-color);
    }

    /*
     * Make sure form elements are readable.
     * They probably won't be pretty, but hey.
     */
    input, select, textarea {
        color: var(--default-fg-color) ! important;
        /* Yes, override both "background" AND "background-color" */
        background-color: var(--default-bg-color) ! important;
        background: var(--default-bg-color) ! important;
    }
}

/*
 * "Internal" FF pages
 */
@-moz-document url-prefix("about:") {
    /* Make sure we can read the search box */
    #newtab-search-text, #searchSubmit {
        color: var(--default-bg-color) ! important;
        background-color: var(--default-fg-color) ! important;
    }
}

/* 
 * EOF
 */