--- a/devtools/client/themes/toolbox.css
+++ b/devtools/client/themes/toolbox.css
@@ -183,16 +183,21 @@
 }
 
 .devtools-tab.highlighted > img {
   fill: var(--theme-toolbar-highlighted-color);
 }
 
 /* Toolbox controls */
 
+#toolbox-buttons-end > .devtools-separator {
+  margin-inline-start: 5px;
+  margin-inline-end: 5px;
+}
+
 /* Save space in Firebug theme */
 .theme-firebug #toolbox-controls button {
   margin-inline-start: 0 !important;
   min-width: 12px;
   margin: 0 1px;
 }
 
 #toolbox-close::before {