--- a/browser/themes/windows/devedition.css
+++ b/browser/themes/windows/devedition.css
@@ -255,16 +255,22 @@
 
 #navigator-toolbox {
   /* The side borders on the toolbox also look out-of-place because we don't paint over
    * the native background color at all, and these are !important for the same reason as above. */
   border-left: none !important;
   border-right: none !important;
 }
 
+/* Disable dragging like in the default theme: */
+#main-window[tabsintitlebar] #navigator-toolbox > toolbar:not(#toolbar-menubar):not(#TabsToolbar):-moz-lwtheme,
+#main-window[tabsintitlebar] #PlacesToolbarItems:-moz-lwtheme {
+  -moz-window-dragging: no-drag;
+}
+
 /* The sidebar header has no background now that the background of the #browser-panel
  * has no image and is transparent. Fix: */
 .sidebar-header:-moz-lwtheme,
 #sidebar-header {
   background-color: var(--chrome-background-color);
   color: var(--chrome-color);
 }