Minimal Firefox CSS emplate

userChrome.css

/*
Credits to u/phyrne

Code Source: https://github.com/cmacrae/config/blob/b33ccb041861b56c97e1744b0fd8c606e343164c/conf.d/userChrome.css
Reddit Source: https://www.reddit.com/r/FirefoxCSS/comments/gh5a10/a_minimal_set_of_customisations_inspired_by/
*/

/*
 *  Hide window controls
 */
.titlebar-buttonbox-container{
    display: none !important;
}

.titlebar-placeholder,
#TabsToolbar .titlebar-spacer{ display: none; }
#navigator-toolbox::after{ display: none !important; }


/*
 *  Hide all the clutter in the navbar
 */
#main-window :-moz-any(
		       #stop-reload-button,
		       #home-button,
		       #library-button,
		       #sidebar-button,
		       #star-button,
		       #pocket-button,
		       #permissions-granted-icon,
		       #fxa-toolbar-menu-button,
		       #_d7742d87-e61d-4b78-b8a1-b469842139fa_-browser-action,
		       #ublock0_raymondhill_net-browser-action) {
             display: none !important;
           }


/*
 *  Hide tabs if only one tab
 */
#titlebar .tabbrowser-tab[first-visible-tab="true"][last-visible-tab="true"]{
    display: none !important;
}

/*
 *  Minimal theme
 */
#navigator-toolbox {
    font-family: 'Menlo' !important;
    border-bottom: 1px;
    border-bottom-color: #93a1a1 !important;
}

#navigator-toolbox toolbarspring {
    display: none;
}

#navigator-toolbox .tab-line {
    -moz-box-ordinal-group: 2;
}

.tab-line[selected=true] {
    background-color: #ae91e8 !important;
}

/* #navigator-toolbox #urlbar-container {
    padding: 0 !important;
    margin: 0 !important;
} */

#navigator-toolbox #urlbar {
    border: none !important;
    border-radius: 0 !important;
    box-shadow: none !important;
}

#navigator-toolbox #PanelUI-button {
    padding: 0 !important;
    margin: 0 !important;
    border: none !important;
}

#navigator-toolbox #nav-bar {
    background: #2c2734 !important;
    box-shadow: none !important;
}

#navigator-toolbox #pageActionButton {
    display: none;
}

#navigator-toolbox #pageActionSeparator {
    display: none;
}

#fullscr-toggler {
    height: 0 !important;
}

#navigator-toolbox .urlbar-history-dropmarker {
    display: none;
}

#navigator-toolbox #tracking-protection-icon-container {
    padding-right: 0 !important;
    border: none !important;
    display: none !important;
}

#navigator-toolbox .tab-close-button, #navigator-toolbox #tabs-newtab-button {
    display: none;
}

#navigator-toolbox .toolbar-items {
    background: #2c2734  !important;
}

#navigator-toolbox #urlbar {
    background: #2c2734 !important;;
    color: #fdf6e3 !important;
    padding: 0 !important;
    padding-left: 1ch !important;
    font-size: 13px;
    height: 20px;
}

#navigator-toolbox #urlbar-background {
    background: #2c2734 !important;;
    border: none !important;
    margin: 0 !important;
}

#navigator-toolbox #nav-bar-customization-target {
    background: #2c2734 !important;;
}

#navigator-toolbox .toolbarbutton-1 {
    width: 22px;
}

#navigator-toolbox #downloads-button {
    color: #2c2734 ;
    background: #2c2734 !important;
}

#navigator-toolbox #PanelUI-button {
    opacity: 1 !important;
    background: #2c2734 !important;
}

#navigator-toolbox #PanelUI-menu-button {
    background: #2c2734 !important;
    color: #fdf6e3 !important;
}

#navigator-toolbox .tabbrowser-tab {
    font-size: 12px
}

#navigator-toolbox .tab-background {
    background: #2c2734  !important;
    box-shadow: none!important;
    border: none !important;
}

#navigator-toolbox .tabbrowser-tab .tab-label {
    color: #fdf6e3 !important;
}

#navigator-toolbox .tab-background[selected="true"] {
    background: #2c2734  !important;
}

#navigator-toolbox .tabbrowser-tab[selected="true"] .tab-label {
    color: #fdf6e3 !important;
}

#navigator-toolbox .tabbrowser-tab::after {
    display: none !important;
}

#navigator-toolbox #urlbar-zoom-button {
    border: none !important;
}

#appMenu-fxa-container, #appMenu-fxa-container + toolbarseparator {
    display: none !important;
}

#sync-setup {
    display: none !important;
}

/*
 *  Hamburger menu to the left
 */

#PanelUI-button {
    -moz-box-ordinal-group: 0;
    border-left: none !important;
    border-right: none !important;
    position: absolute;
}

#toolbar-context-menu .viewCustomizeToolbar {
    display: none !important;
}

:root[uidensity=compact] #PanelUI-button {
    margin-top: -28px;
}

#PanelUI-button {
    margin-top: -30px;
}

:root[uidensity=touch] #PanelUI-button {
    margin-top: -36px;
}

/*
 *  Tabs to the right of the urlbar
 */

/* Modify these to change relative widths or default height */
#navigator-toolbox{
    --uc-navigationbar-width: 40vw;
    --uc-toolbar-height: 40px;
}
/* Override for other densities */
:root[uidensity="compact"] #navigator-toolbox{ --uc-toolbar-height: 32px; }
:root[uidensity="touch"] #navigator-toolbox{ --uc-toolbar-height: 40px; }

:root[uidensity=compact] #urlbar-container.megabar{
    --urlbar-container-height: var(--uc-toolbar-height) !important;
    padding-block: 0 !important;
}
:root[uidensity=compact] #urlbar.megabar{
    --urlbar-toolbar-height: var(--uc-toolbar-height) !important;
}

/* prevent urlbar overflow on narrow windows */
/* Dependent on how many items are in navigation toolbar ADJUST AS NEEDED */
@media screen and (max-width: 1300px){
    #urlbar-container{ min-width:unset !important }
}

#TabsToolbar{ margin-left: var(--uc-navigationbar-width); }
#tabbrowser-tabs{ --tab-min-height: var(--uc-toolbar-height) !important; }

/* This isn't useful when tabs start in the middle of the window */
.titlebar-placeholder[type="pre-tabs"],
.titlebar-spacer[type="pre-tabs"]{ display: none }

#navigator-toolbox > #nav-bar{
    margin-right:calc(100vw - var(--uc-navigationbar-width));
    margin-top: calc(0px - var(--uc-toolbar-height));
}

/* Zero window drag space  */
:root[tabsintitlebar="true"] #nav-bar{
  padding-left: 0px !important;
  padding-right: 0px !important;
}

/* 1px margin on touch density causes tabs to be too high */
.tab-close-button{ margin-top: 0 !important }

/* Hide dropdown placeholder */
#urlbar-container:not(:hover) .urlbar-history-dropmarker {
  margin-inline-start: -28px;
}

/* Fix customization view */
#customization-panelWrapper > .panel-arrowbox > .panel-arrow {
  margin-inline-end: initial !important;
}