* {
    box-shadow: none !important;
    border: 0px solid !important;
}

#tabbrowser-tabs {
    --user-tab-rounding: 8px;
}

.tab-background {
    border-radius: var(--user-tab-rounding) var(--user-tab-rounding) 0px 0px !important;
    /* Connected */
    margin-block: 1px 0 !important;
    /* Connected */
}

#scrollbutton-up,
#scrollbutton-down {
    /* 6/10/2021 */
    border-top-width: 1px !important;
    border-bottom-width: 0 !important;
}

.tab-background:is([selected], [multiselected]):-moz-lwtheme {
    --lwt-tabs-border-color: rgba(0, 0, 0, 0.5) !important;
    border-bottom-color: transparent !important;
}

[brighttext='true'] .tab-background:is([selected], [multiselected]):-moz-lwtheme {
    --lwt-tabs-border-color: rgba(255, 255, 255, 0.5) !important;
    border-bottom-color: transparent !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;
}

#TabsToolbar,
#tabbrowser-tabs {
    --tab-min-height: 29px !important;
}

#main-window[sizemode='true'] #toolbar-menubar[autohide='true']+#TabsToolbar,
#main-window[sizemode='true'] #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;
}

#TabsToolbar,
#TabsToolbar>hbox,
#TabsToolbar-customization-target,
#tabbrowser-arrowscrollbox {
    max-height: calc(var(--tab-min-height) + 1px) !important;
}

#TabsToolbar-customization-target toolbarbutton>.toolbarbutton-icon,
#TabsToolbar-customization-target .toolbarbutton-text,
#TabsToolbar-customization-target .toolbarbutton-badge-stack,
#scrollbutton-up,
#scrollbutton-down {
    padding-top: 7px !important;
    padding-bottom: 6px !important;
}