diff --git a/toolkit/themes/shared/in-content/common.inc.css b/toolkit/themes/shared/in-content/common.inc.css
index 58dd7c1f669f..5ef0de1508be 100644
--- a/toolkit/themes/shared/in-content/common.inc.css
+++ b/toolkit/themes/shared/in-content/common.inc.css
@@ -517,6 +517,7 @@ html|a:hover:active,
 
 xul|checkbox {
   margin-inline-start: 0;
+  -moz-appearance: none;
 }
 
 xul|*.checkbox-check,
@@ -564,6 +565,7 @@ html|*.toggle-container-with-text {
 
 xul|radio {
   margin-inline-start: 0;
+  -moz-appearance: none;
 }
 
 xul|*.radio-check {