userChrome

/* Adjust tab corner shape, optionally remove space below tabs */

#tabbrowser-tabs {
    --user-tab-rounding: 0px;
}

.tab-background {
    border-radius: var(--user-tab-rounding) var(--user-tab-rounding) 0px 0px !important;
    margin-block: 0px 0 !important;
}
#scrollbutton-up, #scrollbutton-down {
    border-top-width: 1px !important;
    border-bottom-width: 0 !important;
}
/* Container color bar visibility */
.tabbrowser-tab[usercontextid] > .tab-stack > .tab-background > .tab-context-line {
    margin: 0px max(calc(var(--user-tab-rounding) - 3px), 0px) !important;
}

/* Override Normal Density height to Compact Density height only for tabs */

#TabsToolbar, #tabbrowser-tabs {
    --tab-min-height: 29px !important;
}
    /* Tweak for covering a line at the bottom of the active tab on some themes 8/11/2021 */
#main-window[sizemode="normal"] #toolbar-menubar[autohide="true"] + #TabsToolbar,
#main-window[sizemode="normal"] #toolbar-menubar[autohide="true"] + #TabsToolbar #tabbrowser-tabs {
    --tab-min-height: 30px !important;
}
#scrollbutton-up,
#scrollbutton-down {
    border-top-width: 0 !important;
    border-bottom-width: 0 !important;
}

    /* [Connected Tabs] Set a max height based on min-height plus margin-block: 1px 0 */
#TabsToolbar, #TabsToolbar > hbox, #TabsToolbar-customization-target, #tabbrowser-arrowscrollbox  {
    max-height: calc(var(--tab-min-height) + 1px) !important;
}
    /* [Connected Tabs] Adjust padding around icons on buttons to avoid crushed images */
#TabsToolbar-customization-target toolbarbutton > .toolbarbutton-icon,
#TabsToolbar-customization-target .toolbarbutton-text,
#TabsToolbar-customization-target .toolbarbutton-badge-stack,
#scrollbutton-up,#scrollbutton-down {
    padding-top: 8px !important;
    padding-bottom: 7px !important;
}

/* Inactive tabs: Separator line style */

.tabbrowser-tab:not([selected=true]):not([multiselected=true]):not([beforeselected-visible="true"]) .tab-background {
    border-right: 1px solid var(--lwt-background-tab-separator-color, rgba(0, 0, 0, .20)) !important;
}
/* For dark backgrounds */
[brighttext="true"] .tabbrowser-tab:not([selected=true]):not([multiselected=true]):not([beforeselected-visible="true"]) .tab-background {
    border-right: 1px solid var(--lwt-background-tab-separator-color, var(--lwt-selected-tab-background-color, rgba(255, 255, 255, .20))) !important;
}
.tabbrowser-tab:not([selected=true]):not([multiselected=true]) .tab-background {
    border-radius: 0 !important;
}
/* Remove padding between tabs */
.tabbrowser-tab {
    padding-left: 0 !important;
    padding-right: 0 !important;
}

/* Override font-size for tabs */

.tabbrowser-tab {
    font-size: 12px !important;
}

/* Override font-weight for tabs */

.tabbrowser-tab {
    font-weight: 400 !important;
}

/*** Tighten up drop-down/context/popup menu spacing ***/

menupopup:not(.in-menulist) > menuitem,
menupopup:not(.in-menulist) > menu {
  padding-block: 3.5px !important; /* reduce to 3px, 2px, 1px or 0px as needed */
  min-height: unset !important; /* v92.0 - for padding below 4px */
  margin: 0 !important;
  padding-left: 12px !important;
  border-radius: 0 !important;
}
:root {
  --arrowpanel-menuitem-padding: 5px 8px !important;
}



  /* END */