diff --git a/resources/src/mediawiki.ui/components/buttons.less b/resources/src/mediawiki.ui/components/buttons.less
index e189df03fe9..4e8c363b577 100644
--- a/resources/src/mediawiki.ui/components/buttons.less
+++ b/resources/src/mediawiki.ui/components/buttons.less
@@ -199,15 +199,6 @@
 	}
 }
 
-input.mw-ui-button,
-button.mw-ui-button {
-	// Buttons in Firefox have extra height
-	&::-moz-focus-inner {
-		margin-top: -1px;
-		margin-bottom: -1px;
-	}
-}
-
 a.mw-ui-button {
 	text-decoration: none;