--- a/devtools/client/themes/toolbox.css
+++ b/devtools/client/themes/toolbox.css
@@ -186,17 +186,17 @@
   -moz-context-properties: fill;
   fill: var(--theme-toolbar-color);
 }
 
 .devtools-tab.selected > img {
   fill: var(--theme-toolbar-selected-color);
 }
 
-.devtools-tab:not(.selected).highlighted > img {
+.devtools-tab.highlighted > img {
   fill: var(--theme-toolbar-highlighted-color);
 }
 
 /* The options tab is special - it doesn't have the same parent
    as the other tabs (toolbox-option-container vs toolbox-tabs) */
 #toolbox-option-container .devtools-tab {
   border-color: transparent;
   border-width: 0;