diff --git a/res/css/_common.scss b/res/css/_common.scss
index 1284a5c499..d90893b8ed 100644
--- a/res/css/_common.scss
+++ b/res/css/_common.scss
@@ -141,6 +141,12 @@ input[type=search]::-webkit-search-results-decoration {
 input::placeholder,
 textarea::placeholder {
     opacity: initial;
+    font-weight: 400;
+}
+input::-moz-placeholder,
+textarea::-moz-placeholder {
+    opacity: .6;
+    font-weight: 400;
 }
 
 input[type=text], input[type=password], textarea {