@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
    #tabbrowser-tabs, #TabsToolbar, #ctr_appbutton, .tabbrowser-tab { 
        margin-top:  0px !important;
        max-height: 20px !important;
    }    
    .tabbrowser-tab  { 
        margin-top: -1px !important;
    }
    #navigator-toolbox > toolbar {
        max-height: 26px !important;
   }

#back-button > .toolbarbutton-icon
{
    border-radius: 0px !important;
    padding: 1px 3px 1px 3px !important;
}
#forward-button > .toolbarbutton-icon
{
    border-radius: 0px !important;
    padding: 1px 3px 1px 4px !important;
    margin: 0px 1px 0px 0px !important;
}
#back-button
{
    -moz-image-region: rect(0px, 54px, 18px, 36px) !important;
}

#back-button#back-button#back-button>image.toolbarbutton-icon,
#forward-button#forward-button#forward-button>image.toolbarbutton-icon
{
background: none !important;
box-shadow: none !important;
border-color: transparent !important;
}

/* Настройки кнопок "Вперёд", "Назад" */

#nav-bar{min-height: 24px !important;}

#back-button > .toolbarbutton-icon{
    border-radius: 2px !important;
    padding: 2px 3px 2px 3px !important;
    border: none!important;
    box-shadow: none!important;}

#forward-button > .toolbarbutton-icon{
    border-radius: 2px !important;
    padding: 2px 3px 2px 3px !important;
    margin: 0px 2px 0px 0px !important;
    border: none!important;
    box-shadow: none!important;}

#back-button{-moz-image-region: rect(0px, 54px, 18px, 36px) !important;}

#urlbar{
    border: 1px solid rgba(23, 51, 78, 0.3) !important;
    border-radius: 2px !important;}

#urlbar-wrapper{
    clip-path: none !important;
    -moz-margin-start: 0px !important;}

#nav-bar-customization-target > toolbarbutton > dropmarker,
#forward-button
{
    margin-left: 0px !important;
}

#nav-bar-customization-target > toolbarbutton,
#nav-bar-customization-target > toolbarbutton *,
#nav-bar-overflow-button,
#nav-bar-overflow-button > .toolbarbutton-icon,
#PanelUI-menu-button,
#PanelUI-menu-button > .toolbarbutton-icon,
#identity-box,
#identity-box > image
{
    padding: 0 1px !important;
}

#urlbar{margin-left: 3px !important;}

#forward-button:not(:-moz-any(:hover,:active)) > .toolbarbutton-icon, #back-button:not(:-moz-any(:hover,:active)) > .toolbarbutton-icon,
#forward-button[disabled='true'] > .toolbarbutton-icon, #back-button[disabled='true'] > .toolbarbutton-icon
{        
    background: none!important;
}

/* Настройки кнопок "Вперёд", "Назад" */

/* Reduce paddings for items of nav-bar */
#nav-bar-customization-target > toolbarbutton,
#nav-bar-customization-target > toolbarbutton *,
#nav-bar-overflow-button,
#nav-bar-overflow-button > .toolbarbutton-icon,
#PanelUI-menu-button,
#PanelUI-menu-button > .toolbarbutton-icon,
#identity-box,
#identity-box > image
{
    padding: 0 1px !important;
}

#nav-bar toolbarbutton,
#nav-bar .toolbarbutton-1,
#nav-bar toolbarbutton > .toolbarbutton-menubutton-dropmarker{
padding: unset !important;
width: unset !important;
height: unset !important;
}
#nav-bar  toolbarbutton > dropmarker:before{
display: none!important;
}
#nav-bar toolbarbutton > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon{
width: unset !important;
height: unset !important;
border-left:none !important;
padding-left: 0 !important;
padding-right: 0 !important;
}
#nav-bar toolbarbutton:not([id='bookmarks-menu-button']) > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon{
padding-top: 7px!important;
}
#nav-bar .toolbarbutton-menubutton-button > .toolbarbutton-icon,
#nav-bar .toolbarbutton-1 > .toolbarbutton-icon,
#nav-bar toolbarbutton > .toolbarbutton-icon,
/* удалите следующую строку, если будут проблемы у кнопкок с бейджами */
#nav-bar .toolbarbutton-1 > .toolbarbutton-badge-container{
padding-left: 1px !important;
padding-right: 1px !important;
width: unset !important;
height: unset !important;
}