--- a/devtools/client/jsonview/components/json-panel.js
+++ b/devtools/client/jsonview/components/json-panel.js
@@ -54,17 +54,17 @@ define(function (require, exports, modul
     },
 
     onFilter: function (object) {
       if (!this.props.searchFilter) {
         return true;
       }
 
       let json = JSON.stringify(object).toLowerCase();
-      return json.indexOf(this.props.searchFilter) >= 0;
+      return json.indexOf(this.props.searchFilter.toLowerCase()) >= 0;
     },
 
     getExpandedNodes: function (object, path = "", level = 0) {
       if (typeof object != "object") {
         return null;
       }
 
       if (level > AUTO_EXPAND_MAX_LEVEL) {