diff --git a/rhodecode/public/css/code-block.less b/rhodecode/public/css/code-block.less
--- a/rhodecode/public/css/code-block.less
+++ b/rhodecode/public/css/code-block.less
@@ -1091,6 +1091,8 @@ table.cb {
             text-align: right;
             border-right: 1px solid #eee;
             font-family: @font-family-monospace;
+            -webkit-user-select: none;
+            -moz-user-select: none;
             user-select: none;
 
             a::before {