diff --git a/browser/themes/winstripe/browser/browser-aero.css b/browser/themes/winstripe/browser/browser-aero.css
index 9df2d938865..1ce70024c8c 100644
--- a/browser/themes/winstripe/browser/browser-aero.css
+++ b/browser/themes/winstripe/browser/browser-aero.css
@@ -33,19 +33,12 @@
                 0 0 2px 1px rgba(255,255,255,.25) inset;
   }
 
-  #main-window[privatebrowsingmode=temporary] #appmenu-button:not(:-moz-window-inactive) {
+  #main-window[privatebrowsingmode=temporary] #appmenu-button {
     -moz-border-left-colors: rgba(255,255,255,.5) rgba(43,8,65,.9);
     -moz-border-bottom-colors: rgba(255,255,255,.5) rgba(43,8,65,.9);
     -moz-border-right-colors: rgba(255,255,255,.5) rgba(43,8,65,.9);
   }
 
-  #appmenu-button:-moz-window-inactive {
-    -moz-border-left-colors: rgba(255,255,255,.4) rgba(0,0,0,.5);
-    -moz-border-bottom-colors: rgba(255,255,255,.4) rgba(0,0,0,.5);
-    -moz-border-right-colors: rgba(255,255,255,.4) rgba(0,0,0,.5);
-    box-shadow: 0 0 0 1px rgba(255,255,255,.25) inset;
-  }
-
   /* Bug 413060, comment 16: Vista Aero is a special case where we use a
      tooltip appearance for the address bar popup panels */
   #identity-popup,
diff --git a/browser/themes/winstripe/browser/browser.css b/browser/themes/winstripe/browser/browser.css
index 2b922125ffe..3fba9d34b64 100644
--- a/browser/themes/winstripe/browser/browser.css
+++ b/browser/themes/winstripe/browser/browser.css
@@ -126,16 +126,11 @@
   margin: 0;
 }
 
-#main-window[privatebrowsingmode=temporary] #appmenu-button:not(:-moz-window-inactive) {
+#main-window[privatebrowsingmode=temporary] #appmenu-button {
   background-image: -moz-linear-gradient(rgb(153,38,211), rgb(105,19,163) 95%);
   border-color: rgba(43,8,65,.9);
 }
 
-#appmenu-button:-moz-window-inactive {
-  background-image: none;
-  border-color: rgba(0,0,0,.4);
-}
-
 #appmenu-button:hover:not(:active):not([open]) {
   background-image: -moz-radial-gradient(center bottom, farthest-side, rgba(252,240,89,.5) 10%, rgba(252,240,89,0) 70%),
                     -moz-radial-gradient(center bottom, farthest-side, rgb(236,133,0), rgba(255,229,172,0)),