diff --git a/application/basilisk/themes/windows/browser.css b/application/basilisk/themes/windows/browser.css
index ee537a4b66..8ce4e4a620 100644
--- a/application/basilisk/themes/windows/browser.css
+++ b/application/basilisk/themes/windows/browser.css
@@ -123,6 +123,13 @@ toolbar:-moz-lwtheme {
   border-top: none;
 }
 
+@media (-moz-os-version: windows-win10) and (-moz-windows-theme: aero) {
+  #navigator-toolbox {
+    /* Override the global style for Windows 10 that adds a bottom border */
+    border-bottom: none;
+  };
+}
+
 #navigator-toolbox::after {
   content: "";
   display: -moz-box;
diff --git a/application/basilisk/themes/windows/places/organizer.css b/application/basilisk/themes/windows/places/organizer.css
index 4de603b9f3..263286d556 100644
--- a/application/basilisk/themes/windows/places/organizer.css
+++ b/application/basilisk/themes/windows/places/organizer.css
@@ -193,6 +193,13 @@
   }
 }
 
+@media (-moz-os-version: windows-win10) and (-moz-windows-theme: aero) {
+  #placesToolbox {
+    /* Override the global style for Windows 10 that adds a bottom border */
+    border-bottom: none;
+  }
+}
+
 @media (-moz-windows-default-theme) and (-moz-os-version: windows-vista),
        (-moz-windows-default-theme) and (-moz-os-version: windows-win7) {
   #placesView,