diff --git a/searx/static/themes/simple/src/less/mixins.less b/searx/static/themes/simple/src/less/mixins.less
index cc4a5bc64..00a2bb706 100644
--- a/searx/static/themes/simple/src/less/mixins.less
+++ b/searx/static/themes/simple/src/less/mixins.less
@@ -12,19 +12,16 @@
 
 .rounded-corners (@radius: 10px) {
   -webkit-border-radius: @radius;
-  -moz-border-radius: @radius;
   border-radius: @radius;
 }
 
 .rounded-right-corners (@radius: 0 10px 10px 0) {
   -webkit-border-radius: @radius;
-  -moz-border-radius: @radius;
   border-radius: @radius;
 }
 
 .rounded-corners-tiny (@radius: 5px) {
   -webkit-border-radius: @radius;
-  -moz-border-radius: @radius;
   border-radius: @radius;
 }