--- a/browser/themes/winstripe/browser/browser.css
+++ b/browser/themes/winstripe/browser/browser.css
@@ -371,17 +371,17 @@ toolbar[iconsize="small"][mode="icons"] 
 
 .toolbarbutton-menubutton-button[disabled="true"] > .toolbarbutton-icon,
 .toolbarbutton-1[disabled="true"] > .toolbarbutton-icon {
   opacity: .5;
 }
 
 .toolbarbutton-menubutton-button:not([disabled="true"]):not(:active):hover,
 toolbarbutton[type="menu-button"]:not([open="true"]):not(:active):hover > .toolbarbutton-menubutton-dropmarker:not([disabled="true"]),
-.toolbarbutton-1:not([disabled="true"]):not([checked="true"]):not(:active):hover {
+.toolbarbutton-1:not([disabled="true"]):not([checked="true"]):not([open="true"]):not(:active):hover {
   background-color: hsla(190,60%,70%,.5);
   border-color: hsla(190,50%,65%,.8) hsla(190,50%,50%,.8) hsla(190,50%,40%,.8);
   -moz-box-shadow: 0 0 0 1px rgba(255,255,255,.3) inset,
                    0 0 0 2px rgba(255,255,255,.1) inset,
                    0 1px 0 rgba(0,0,0,.1),
                    0 0 5px hsl(190,90%,80%);
   -moz-transition: background-color .4s ease-in,
                    border-color .3s ease-in,