--- a/devtools/client/shared/components/tree/tree-cell.js
+++ b/devtools/client/shared/components/tree/tree-cell.js
@@ -62,17 +62,17 @@ define(function (require, exports, modul
         classNames = [classNames];
       }
 
       return classNames;
     },
 
     updateInputEnabled: function (evt) {
       this.setState(Object.assign({}, this.state, {
-        inputEnabled: evt.target.nodeName !== "input",
+        inputEnabled: evt.target.nodeName.toLowerCase() !== "input",
       }));
     },
 
     render: function () {
       let {
         member,
         id,
         value,