--- a/devtools/client/netmonitor/src/components/HeadersPanel.js
+++ b/devtools/client/netmonitor/src/components/HeadersPanel.js
@@ -148,16 +148,17 @@ class HeadersPanel extends Component {
     return (
       div({ className: "treeValueCellDivider" },
         Rep(Object.assign(props, {
           // FIXME: A workaround for the issue in StringRep
           // Force StringRep to crop the text everytime
           member: Object.assign({}, member, { open: false }),
           mode: MODE.TINY,
           cropLimit: 60,
+          noGrip: true,
         })),
         headerDocURL ? MDNLink({
           url: headerDocURL,
         }) : null
       )
     );
   }
 

--- a/devtools/client/netmonitor/src/components/PropertiesView.js
+++ b/devtools/client/netmonitor/src/components/PropertiesView.js
@@ -157,16 +157,17 @@ class PropertiesView extends Component {
     }
 
     return Rep(Object.assign(props, {
       // FIXME: A workaround for the issue in StringRep
       // Force StringRep to crop the text every time
       member: Object.assign({}, member, { open: false }),
       mode: MODE.TINY,
       cropLimit: this.props.cropLimit,
+      noGrip: true,
     }));
   }
 
   sectionIsSearchable(object, section) {
     return !(object[section][EDITOR_CONFIG_ID] || object[section][HTML_PREVIEW_ID]);
   }
 
   shouldRenderSearchBox(object) {

--- a/devtools/client/netmonitor/test/browser.ini
+++ b/devtools/client/netmonitor/test/browser.ini
@@ -129,16 +129,17 @@ skip-if = (os == 'linux' && debug && bit
 [browser_net_headers-alignment.js]
 [browser_net_headers_filter.js]
 [browser_net_headers_sorted.js]
 [browser_net_image-tooltip.js]
 [browser_net_json-b64.js]
 [browser_net_json-null.js]
 [browser_net_json-long.js]
 [browser_net_json-malformed.js]
+[browser_net_json-nogrip.js]
 [browser_net_json_custom_mime.js]
 [browser_net_json_text_mime.js]
 [browser_net_jsonp.js]
 [browser_net_large-response.js]
 [browser_net_leak_on_tab_close.js]
 [browser_net_open_in_debugger.js]
 [browser_net_open_in_style_editor.js]
 [browser_net_open_request_in_tab.js]

new file mode 100644
--- /dev/null
+++ b/devtools/client/netmonitor/test/browser_net_json-nogrip.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests if JSON responses with property 'type' are correctly rendered.
+ * (Reps rendering JSON responses should use `noGrip=true`).
+ */
+add_task(async function() {
+  let { tab, monitor } = await initNetMonitor(JSON_BASIC_URL + "?name=nogrip");
+  info("Starting test... ");
+
+  let { document, store, windowRequire } = monitor.panelWin;
+  let Actions = windowRequire("devtools/client/netmonitor/src/actions/index");
+
+  store.dispatch(Actions.batchEnable(false));
+
+  await performRequests(monitor, tab, 1);
+
+  let onResponsePanelReady = waitForDOM(document, "#response-panel .CodeMirror-code");
+  store.dispatch(Actions.toggleNetworkDetails());
+  EventUtils.sendMouseEvent({ type: "click" },
+    document.querySelector("#response-tab"));
+  await onResponsePanelReady;
+
+  let tabpanel = document.querySelector("#response-panel");
+  let labels = tabpanel
+    .querySelectorAll("tr:not(.tree-section) .treeLabelCell .treeLabel");
+  let values = tabpanel
+    .querySelectorAll("tr:not(.tree-section) .treeValueCell .objectBox");
+
+  // Verify that an object is rendered: `obj: {…}`
+  is(labels[0].textContent, "obj", "The first json property name is correct.");
+  is(values[0].textContent, "{\u2026}", "The first json property value is correct.");
+
+  await teardown(monitor);
+});

--- a/devtools/client/netmonitor/test/sjs_json-test-server.sjs
+++ b/devtools/client/netmonitor/test/sjs_json-test-server.sjs
@@ -13,10 +13,13 @@ function handleRequest(request, response
   // This server checks the name parameter from the request to decide which JSON object to
   // return.
   let params = request.queryString.split("&");
   let name = (params.filter((s) => s.includes("name="))[0] || "").split("=")[1];
   switch (name) {
     case "null":
       response.write("{ \"greeting\": null }");
       break;
+    case "nogrip":
+      response.write("{\"obj\": {\"type\": \"string\" }}");
+      break;
   }
 }