Hide minimize/maximize/close buttons (MR 39)

src/userChrome/browser.css

@@ -1,8 +1,8 @@
 /* Copyright 2022 plata
  * SPDX-License-Identifier: MPL-2.0 */
 
-/* Move navigation bar to bottom */
 @media (max-width: 700px) {
+    /* Move navigation bar to bottom */
     #browser {
         -moz-box-ordinal-group: 0 !important; /* before FF 113 */
         order: -1 !important; /* since FF 113 */
@@ -16,4 +16,9 @@
     #TabsToolbar[inFullscreen] {
         display: none;
     }
+
+    /* Hide minimize/maximize/close buttons */
+    .titlebar-buttonbox-container {
+        display: none;
+    }
 }