userChrome.css

@charset "UTF-8";
@namespace url('http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul');

/* Top */
#main-window:not([sizemode="maximized"]) #toolbar-menubar {
    margin-bottom: -12px !important;
}

/* Slimbar */
#nav-bar .toolbarbutton-1:not([type=menu-button]),
#nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-button,
#nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
    padding: 0 !important;
}

/* Toolicon Width */
#nav-bar .toolbarbutton-1:not([type=menu-button]):not(:-moz-any(#back-button,#forward-button)),
#nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-button,
#nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
    padding-left: 0 !important;
    padding-right: 0 !important;
}

#nav-bar .toolbarbutton-1[type=menu]:not(#back-button):not(#forward-button):not(#feed-button
):not(#social-provider-button):not(#PanelUI-menu-button) {
    padding-left: 3px !important;
    padding-right: 3px !important;
}

#nav-bar .toolbarbutton-1:not(:-moz-any(#back-button,#forward-button)) > .toolbarbutton-icon,
#nav-bar .toolbarbutton-1 > .toolbarbutton-text,
#nav-bar .toolbarbutton-1 > .toolbarbutton-badge-container,
#nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon,
#nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon,
window:not([chromehidden~="toolbar"]) #urlbar-container > .toolbarbutton-1:-moz-any(
[disabled],:not([open]):not([disabled]):not(:active)) > .toolbarbutton-icon {
    padding-left: 2px !important;
    padding-right: 2px !important;
}

#home-button, #print-button, #downloads-button, #bookmarks-menu-button, #new-tab-button, #new-window-button, #fullscreen-button, #sync-button, #feed-button, #tabview-button, #webrtc-status-button, #social-share-button, #open-file-button, #find-button, #developer-button, #preferences-button, #privatebrowsing-button, #save-page-button, #switch-to-metro-button, #add-ons-button, #history-panelmenu, #nav-bar-overflow-button, #PanelUI-menu-button, #characterencoding-button, #email-link-button, #sidebar-button, #zoom-out-button, #zoom-reset-button, #zoom-in-button, #cut-button, #copy-button, #paste-button)) > .toolbarbutton-icon, #home-button, #print-button, #downloads-button, #bookmarks-menu-button, #new-tab-button, #new-window-button, #fullscreen-button, #sync-button, #feed-button, #tabview-button, #webrtc-status-button, #social-share-button, #open-file-button, #find-button, #developer-button, #preferences-button, #privatebrowsing-button, #save-page-button, #switch-to-metro-button, #add-ons-button, #history-panelmenu, #nav-bar-overflow-button, #PanelUI-menu-button, #characterencoding-button, #email-link-button, #sidebar-button, #zoom-out-button, #zoom-reset-button, #zoom-in-button, #cut-button, #copy-button, #paste-button)) > .toolbarbutton-badge-container, #home-button, #print-button, #downloads-button, #bookmarks-menu-button, #new-tab-button, #new-window-button, #fullscreen-button, #sync-button, #feed-button, #tabview-button, #webrtc-status-button, #social-share-button, #open-file-button, #find-button, #developer-button, #preferences-button, #privatebrowsing-button, #save-page-button, #switch-to-metro-button, #add-ons-button, #history-panelmenu, #nav-bar-overflow-button, #PanelUI-menu-button, #characterencoding-button, #email-link-button, #sidebar-button, #zoom-out-button, #zoom-reset-button, #zoom-in-button, #cut-button, #copy-button, #paste-button)) > .toolbarbutton-menubutton-button > .toolbarbutton-icon {
    padding-left: 3px !important;
    padding-right: 3px !important;
}