--- a/toolkit/themes/linux/global/menu.css
+++ b/toolkit/themes/linux/global/menu.css
@@ -84,17 +84,16 @@ menulist > menupopup > menu {
   max-width: none;
   font: message-box;
 }
 
 /* ..... internal content .... */
 
 .menu-text,
 .menu-iconic-left,
-.menu-iconic-right,
 .menu-iconic-text {
   margin-top: 0px !important;
   margin-bottom: 0px !important;
   margin-inline-start: 0px !important;
   margin-inline-end: 2px !important;
   color: inherit;
 }
 
@@ -116,18 +115,17 @@ menucaption > .menu-iconic-text {
   margin-inline-start: 7px !important;
   color: inherit;
 }
 
 .menu-accel-container {
   -moz-box-pack: end;
 }
 
-.menu-iconic-left,
-.menu-iconic-right {
+.menu-iconic-left {
   width: 16px;
   /* We can only hardcode this, to make the default GTK icon<->label spacing */
   padding-inline-end: 3px !important;
 }
 
 .menu-iconic-icon {
   width: 16px;
   height: 16px;