diff --git a/application/basilisk/themes/linux/browser.css b/application/basilisk/themes/linux/browser.css
index fbc5b651bc..fb7913ea26 100644
--- a/application/basilisk/themes/linux/browser.css
+++ b/application/basilisk/themes/linux/browser.css
@@ -80,7 +80,7 @@
 }
 
 #navigator-toolbox > toolbar:not(#toolbar-menubar):not(#TabsToolbar):not(#nav-bar):not(#addon-bar) {
-  overflow: -moz-hidden-unscrollable;
+  overflow: clip;
   max-height: 4em;
   transition: min-height 170ms ease-out, max-height 170ms ease-out;
   padding: 1px 4px;
diff --git a/application/basilisk/themes/osx/browser.css b/application/basilisk/themes/osx/browser.css
index 70f1f61628..2bc5f9d7ed 100644
--- a/application/basilisk/themes/osx/browser.css
+++ b/application/basilisk/themes/osx/browser.css
@@ -164,7 +164,7 @@
 }
 
 #navigator-toolbox > toolbar:not(#toolbar-menubar):not(#TabsToolbar):not(#nav-bar):not(#addon-bar) {
-  overflow: -moz-hidden-unscrollable;
+  overflow: clip;
   max-height: 4em;
   transition: min-height 170ms ease-out, max-height 170ms ease-out;
 }
diff --git a/application/basilisk/themes/windows/browser-aero.css b/application/basilisk/themes/windows/browser-aero.css
index 28599af7a0..74c845580a 100644
--- a/application/basilisk/themes/windows/browser-aero.css
+++ b/application/basilisk/themes/windows/browser-aero.css
@@ -590,7 +590,7 @@
 
   /* Need to constrain the glass fog to avoid overlapping layers, see bug 886281. */
   #navigator-toolbox:not(:-moz-lwtheme) {
-    overflow: -moz-hidden-unscrollable;
+    overflow: clip;
   }
 
   #main-window[sizemode=normal] .tabbrowser-arrowscrollbox > .arrowscrollbox-scrollbox > .scrollbox-innerbox:not(:-moz-lwtheme) {
diff --git a/application/basilisk/themes/windows/browser.css b/application/basilisk/themes/windows/browser.css
index a3749a0f28..375e1e5608 100644
--- a/application/basilisk/themes/windows/browser.css
+++ b/application/basilisk/themes/windows/browser.css
@@ -184,7 +184,7 @@ toolbar:-moz-lwtheme {
 }
 
 #navigator-toolbox > toolbar:not(#toolbar-menubar):not(#TabsToolbar):not(#nav-bar):not(#addon-bar) {
-  overflow: -moz-hidden-unscrollable;
+  overflow: clip;
   max-height: 4em;
   transition: min-height 170ms ease-out, max-height 170ms ease-out;
   padding: 0 5px;
@@ -282,7 +282,7 @@ toolbar:-moz-lwtheme {
 
   /* Need to constrain the box shadow fade to avoid overlapping layers, see bug 886281. */
   #main-window[tabsintitlebar]:not([sizemode=fullscreen]) #navigator-toolbox:not(:-moz-lwtheme) {
-    overflow: -moz-hidden-unscrollable;
+    overflow: clip;
   }
 
   /**