diff --git a/src/other/firefox/common/hide-window-buttons.css b/src/other/firefox/common/hide-window-buttons.css
index d4e8b046..f7c3e17c 100644
--- a/src/other/firefox/common/hide-window-buttons.css
+++ b/src/other/firefox/common/hide-window-buttons.css
@@ -1,10 +1,10 @@
 @namespace xul url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
-:root[tabsintitlebar][sizemode="maximized"] #nav-bar .titlebar-buttonbox-container,
-:root[tabsintitlebar][sizemode="maximized"] #titlebar .titlebar-buttonbox-container {
+[sizemode="maximized"] #nav-bar .titlebar-buttonbox-container,
+[sizemode="maximized"] #titlebar .titlebar-buttonbox-container {
     display: none !important;
 }
 
-:root[tabsintitlebar][sizemode="maximized"] #nav-bar {
+[sizemode="maximized"] #nav-bar {
     padding-left: 3px !important;
 }