--- a/browser/themes/windows/compacttheme.css
+++ b/browser/themes/windows/compacttheme.css
@@ -13,16 +13,27 @@
    theme. It can't be changed to transparent when there is no compositor
    (Win 7 in classic / basic theme), or else dragging and focus become
    broken. So instead just show the normal titlebar in that case, and override
    the window color as transparent when the compositor is available. */
 @media (-moz-windows-compositor: 0) {
   #main-window[tabsintitlebar] #titlebar:-moz-lwtheme {
     visibility: visible;
   }
+
+  /* Prevent accent color overriding the window background for
+   * light and dark theme on Aero Basic. This is copied from browser-aero.css. */
+  @media (-moz-windows-default-theme) {
+    #main-window {
+      background-color: rgb(185,209,234) !important;
+    }
+    #main-window:-moz-window-inactive {
+      background-color: rgb(215,228,242) !important;
+    }
+  }
 }
 
 #toolbar-menubar {
   text-shadow: none !important;
 }
 
 @media (-moz-os-version: windows-win7) {
   @media (-moz-windows-default-theme) {