userChrome.css

/* https://www.reddit.com/r/FirefoxCSS/comments/encagv/move_url_bar_to_bottom_in_ff72/ */

/* Bring the browser window to the top */
/* #urlbar { */
/*   order: 3; */
/* } */

/* https://github.com/mozilla/gecko-dev/blob/f60cf6bfa8bd096efd9bb3a445364f5a0f32897a/browser/base/content/browser.xhtml#L157 */

/* https://github.com/mozilla/gecko-dev/blob/f60cf6bfa8bd096efd9bb3a445364f5a0f32897a/browser/base/content/browser-box.inc.xhtml */
#browser {
    /* order: 0 !important; */
}

/* https://github.com/mozilla/gecko-dev/blob/f60cf6bfa8bd096efd9bb3a445364f5a0f32897a/browser/base/content/navigator-toolbox.inc.xhtml */
/* https://www.reddit.com/r/FirefoxCSS/comments/17hupsn/userchromecss_naigatortoolbar_background_broken/ */
#navigator-toolbox {
    /* `order: 1` was `-moz-box-ordinal-group` (see also https://www.reddit.com/r/FirefoxCSS/comments/13ckx1r/firefox_113_tabs_under_address_bar_how_to_do_this/) */
    order: 1 !important;
}


/* Open the popup on top of tabar */
#urlbar-container .urlbarView {
  bottom: 600px;
  background-color: black;
}