firefox-gnome-theme/theme/parts/buttons.css

/* Buttons */
@import "buttons-fixes.css";
@namespace xul "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";

/* Hide buttons separator */
#nav-bar .toolbaritem-combined-buttons separator {
	display: none !important;
}
#appMenu-popup .toolbaritem-combined-buttons toolbarseparator {
	border: 0 !important;
}

/* Buttons  */
#nav-bar toolbarbutton:not(#urlbar-zoom-button):not(.subviewbutton),
.subviewbutton.panel-subview-footer,
.panel-footer button,
#downloadsHistory,
#downloadsPanel-mainView .download-state .downloadButton,
#overflowMenu-customize-button,
#appMenu-popup .panel-banner-item,
#appMenu-popup .toolbaritem-combined-buttons toolbarbutton:not(#appMenu-fxa-label),
.subviewbutton-back,
#context-navigation menuitem,
.identity-popup-preferences-button:not(#hack),
.findbar-container toolbarbutton,
#sidebar-switcher-target,
#viewButton,
.close-icon:not(.tab-close-button),
#TabsToolbar .toolbarbutton-1 {
	-moz-appearance: none !important;
	background: var(--gnome-button-background) !important;
	box-shadow: var(--gnome-button-box-shadow) !important;
	border: 1px solid var(--gnome-button-border-color) !important;
	border-bottom-color: var(--gnome-button-border-accent-color) !important;
	border-radius: 5px !important;
	padding: 0 2px !important;
	height: 34px !important;
	max-height: 34px !important;
	min-height: 34px !important;
	min-width: 34px !important;
	color: var(--gnome-toolbar-color) !important;
}

/* Buttons with margins */
#nav-bar toolbarbutton:not(#urlbar-zoom-button):not(.subviewbutton) {
	margin: 0 3px !important;
}
#TabsToolbar .toolbarbutton-1 {
	margin: 1px 3px 2px !important;
}

/* Text buttons */
.subviewbutton.panel-subview-footer,
.panel-footer button,
#downloadsHistory,
#overflowMenu-customize-button,
#appMenu-popup .panel-banner-item,
#appMenu-zoomReset-button:not(#appMenu-fxa-label):not(#hack),
#tracking-protection-preferences-button:not(#hack),
.findbar-container toolbarbutton.findbar-button,
#sidebar-switcher-target,
#viewButton {
	padding: 2px 16px !important;
	text-align: center !important;
}
.subviewbutton.panel-subview-footer label {
	text-align: center !important;
}

/* Hover buttons */
#nav-bar toolbarbutton:not(#urlbar-zoom-button):not(.subviewbutton):not([open]):not([disabled]):hover,
.subviewbutton.panel-subview-footer:hover,
.panel-footer button:hover,
#downloadsHistory:hover,
#downloadsPanel-mainView .download-state .downloadButton:hover,
#overflowMenu-customize-button:hover,
#appMenu-popup .panel-banner-item:hover,
.subviewbutton-back:hover,
#appMenu-popup .toolbaritem-combined-buttons toolbarbutton:not(#appMenu-fxa-label):hover,
#context-navigation menuitem:hover:not([disabled]),
.identity-popup-preferences-button:not(#hack):hover,
.findbar-container toolbarbutton:hover,
.findbar-closebutton .toolbarbutton-icon:hover,
#sidebar-switcher-target:hover,
#viewButton:hover,
.close-icon:not(.tab-close-button):hover,
#TabsToolbar .toolbarbutton-1:hover {
	outline: 0 !important;
	background: var(--gnome-button-hover-background) !important;
}

/* Active buttons */
#nav-bar toolbarbutton:not(#urlbar-zoom-button):not([disabled]):not(#hack):active,
#nav-bar toolbarbutton:not(#urlbar-zoom-button):not([disabled])[open],
.subviewbutton.panel-subview-footer:active,
.panel-footer button:active,
#downloadsHistory:active,
#downloadsPanel-mainView .download-state .downloadButton:active,
#overflowMenu-customize-button:active,
#appMenu-popup .panel-banner-item:active,
.subviewbutton-back:not(#hack):active,
#appMenu-popup .toolbaritem-combined-buttons toolbarbutton:not([disabled]):not(#appMenu-fxa-label):active,
#context-navigation menuitem:active:not([disabled]),
.identity-popup-preferences-button:not(#hack):active,
.findbar-container toolbarbutton[checked],
.findbar-container toolbarbutton:active,
#sidebar-switcher-target:active, #sidebar-switcher-target.active,
#viewButton[open],
.close-icon:not(.tab-close-button):active,
#TabsToolbar .toolbarbutton-1:active, #TabsToolbar .toolbarbutton-1[open] {
	background: var(--gnome-button-active-background) !important;
	box-shadow: var(--gnome-button-active-box-shadow) !important;
	border-color: var(--gnome-button-active-border-color) !important;
	border-bottom-color: var(--gnome-button-active-border-color) !important;
	border-top-color: var(--gnome-button-active-border-accent-color) !important;
}

/* Disabled buttons */
#nav-bar toolbarbutton:not(#urlbar-zoom-button)[disabled],
#appMenu-popup .toolbaritem-combined-buttons toolbarbutton[disabled],
#context-navigation menuitem[disabled] {
	background: var(--gnome-button-disabled-background) !important;
	border-color: var(--gnome-button-disabled-border-color) !important;
	box-shadow: var(--gnome-button-disabled-box-shadow) !important;
	opacity: 1 !important;
}
#nav-bar toolbarbutton:not(#urlbar-zoom-button)[disabled] image,
#appMenu-popup .toolbaritem-combined-buttons toolbarbutton[disabled] image,
#context-navigation menuitem[disabled] image {
	opacity: .4 !important;
}

#nav-bar toolbarbutton:not(#urlbar-zoom-button)[disabled]:hover,
#appMenu-popup .toolbaritem-combined-buttons toolbarbutton[disabled]:hover {
	background: var(--gnome-button-disabled-background) !important;
}

/* Inactive window buttons */
#nav-bar toolbarbutton:not(#urlbar-zoom-button):not(.subviewbutton):-moz-window-inactive,
.findbar-container toolbarbutton:-moz-window-inactive,
#sidebar-switcher-target:-moz-window-inactive,
#viewButton:-moz-window-inactive {	
	background: var(--gnome-inactive-button-background) !important;
	box-shadow: var(--gnome-inactive-button-box-shadow) !important;
	border-color: var(--gnome-inactive-button-border-color) !important;
}

/* Flat buttons */
.subviewbutton-back:not(#hack),
.close-icon:not(.tab-close-button),
#TabsToolbar .toolbarbutton-1 {
	background: transparent !important;
	box-shadow: none !important;
	border-color: transparent !important;
	border-radius: 5px !important;
}
.subviewbutton-back:not(#hack):not(:active):hover,
.close-icon:not(.tab-close-button):not(:active):hover,
#TabsToolbar .toolbarbutton-1:not(:active):not([open]):hover {
	box-shadow: var(--gnome-button-box-shadow) !important;
	border-color: var(--gnome-button-border-color) !important;
	border-bottom-color: var(--gnome-button-border-accent-color) !important;
}

/* Circle buttons */
#downloadsPanel-mainView .download-state .downloadButton {
	border-radius: 100% !important;
}

/* Combined buttons */
#nav-bar .toolbaritem-combined-buttons toolbarbutton:not(:last-of-type):not(#hack),
#nav-bar #back-button:not(#hack),
.subviewbutton.panel-subview-footer:not(:only-of-type):not(:last-of-type),
.panel-footer button:not(:only-of-type):not(:last-of-type),
#appMenu-popup .toolbaritem-combined-buttons toolbarbutton:not(:last-of-type):not(#appMenu-zoomEnlarge-button),
#context-navigation menuitem:not(:last-of-type),
.findbar-container toolbarbutton.findbar-find-previous {
	border-top-right-radius: 0 !important;
	border-bottom-right-radius: 0 !important;
	border-right-width: 0 !important;
	margin-right: 0 !important;
}

#nav-bar .toolbaritem-combined-buttons toolbarbutton:not(:first-of-type):not(#hack),
#nav-bar #forward-button:not(#hack),
.subviewbutton.panel-subview-footer:not(:only-of-type):not(:first-of-type),
.panel-footer button:not(:only-of-type):not(:first-of-type),
#appMenu-popup .toolbaritem-combined-buttons toolbarbutton:not(:first-of-type):not(#appMenu-fullscreen-button),
#context-navigation menuitem:not(:first-of-type),
.findbar-container toolbarbutton.findbar-find-previous,
.findbar-container toolbarbutton.findbar-find-next {
	border-top-left-radius: 0 !important;
	border-bottom-left-radius: 0 !important;
	margin-left: 0 !important;
}

#nav-bar .toolbaritem-combined-buttons {
	margin-left: 0 !important;
	margin-right: 0 !important;
}

/* Buttons with suggested action */
#appMenu-popup .panel-banner-item[notificationid="update-restart"],
button.popup-notification-primary-button,
#editBookmarkPanelDoneButton {
	color: white !important;
	background: var(--gnome-button-suggested-action-background) !important;
	border-color: var(--gnome-button-suggested-action-border-color) !important;
	border-bottom-color: var(--gnome-button-suggested-action-border-accent-color) !important;	
	box-shadow: var(--gnome-button-suggested-action-box-shadow) !important;
	text-shadow: 0 -1px rgba(0, 0, 0, 0.559216) !important;
}

#appMenu-popup .panel-banner-item[notificationid="update-restart"]:hover,
button.popup-notification-primary-button.popup-notification-button:hover,
#editBookmarkPanelDoneButton:hover {
	background: var(--gnome-button-suggested-action-hover-background) !important;
}

#appMenu-popup .panel-banner-item[notificationid="update-restart"]:active,
button.popup-notification-primary-button.popup-notification-button:active,
#editBookmarkPanelDoneButton:active {
	background: var(--gnome-button-suggested-action-active-background) !important;
	border-color: var(--gnome-button-suggested-action-active-border-color) !important;
	box-shadow: var(--gnome-button-suggested-action-active-box-shadow) !important;
	text-shadow: none !important;
}

/* Buttons with destructive action */
#editBookmarkPanelRemoveButton {
	color: white !important;
	background: var(--gnome-button-destructive-action-background) !important;
	border-color: var(--gnome-button-destructive-action-border-color) !important;
	border-bottom-color: var(--gnome-button-destructive-action-border-accent-color) !important;
	box-shadow: var(--gnome-button-destructive-action-box-shadow) !important;
	text-shadow: 0 -1px rgba(0, 0, 0, 0.558275) !important;
}

#editBookmarkPanelRemoveButton:hover {
	background: var(--gnome-button-destructive-action-hover-background) !important;	
}

#editBookmarkPanelRemoveButton:active {
	background: var(--gnome-button-destructive-action-active-background) !important;
	border-color: var(--gnome-button-destructive-action-active-border-color) !important;
	box-shadow: var(--gnome-button-destructive-action-active-box-shadow) !important;
}
	
/* User sync menu, bigger avatar */
#fxa-toolbar-menu-button .toolbarbutton-badge-stack {
	padding: 0 !important;
	margin: 0 !important;
}
#fxa-avatar-image {	
	height: 26px !important;
	margin: 0 !important;
	padding: 0 !important;
	width: 26px !important;
}