diff --git a/testing/talos/talos/tests/devtools/addon/content/tests/debugger/custom.js b/testing/talos/talos/tests/devtools/addon/content/tests/debugger/custom.js
index 91c1781f90d0..a1d001380ce2 100644
--- a/testing/talos/talos/tests/devtools/addon/content/tests/debugger/custom.js
+++ b/testing/talos/talos/tests/devtools/addon/content/tests/debugger/custom.js
@@ -42,6 +42,11 @@ module.exports = async function() {

   // these tests are only run on custom.jsdebugger
   await pauseDebuggerAndLog(tab, toolbox, EXPECTED_FUNCTION);
+
+  console.log(`>>>> BEGIN STEPPING`)
+  await new Promise(() => {})
+
+
   await stepDebuggerAndLog(tab, toolbox, EXPECTED_FUNCTION);

   await testProjectSearch(tab, toolbox);
diff --git a/testing/talos/talos/tests/devtools/addon/content/tests/debugger/debugger-helpers.js b/testing/talos/talos/tests/devtools/addon/content/tests/debugger/debugger-helpers.js
index 8847c0f90bf1..d68aa329081b 100644
--- a/testing/talos/talos/tests/devtools/addon/content/tests/debugger/debugger-helpers.js
+++ b/testing/talos/talos/tests/devtools/addon/content/tests/debugger/debugger-helpers.js
@@ -17,7 +17,19 @@ const InspectorUtils = require("InspectorUtils");

 const DEBUGGER_POLLING_INTERVAL = 50;

+
+const mark =
+  window.performance && window.performance.mark
+    ? window.performance.mark.bind(window.performance)
+    : a => {};
+
+const measure =
+  window.performance && window.performance.measure
+    ? window.performance.measure.bind(window.performance)
+    : (a, b, c) => {};
+
 function waitForState(dbg, predicate, msg) {
+  const key = msg.replace(/\s+/,'_')
   return new Promise(resolve => {
     if (msg) {
       dump(`Waiting for state change: ${msg}\n`);
@@ -28,12 +40,14 @@ function waitForState(dbg, predicate, msg) {
       }
       return resolve();
     }
-
+    mark(`${key}_start`);
     const unsubscribe = dbg.store.subscribe(() => {
       if (predicate(dbg.store.getState())) {
         if (msg) {
           dump(`Finished waiting for state change: ${msg}\n`);
         }
+        mark(`${key}_end`);
+        measure(`waitForState_${key}`, `${key}_start`, `${key}_end`);
         unsubscribe();
         resolve();
       }
@@ -44,6 +58,7 @@ function waitForState(dbg, predicate, msg) {

 function waitForDispatch(dbg, type) {
   return new Promise(resolve => {
+    mark(`${type}_start`);
     dbg.store.dispatch({
       type: "@@service/waitUntil",
       predicate: action => {
@@ -55,6 +70,8 @@ function waitForDispatch(dbg, type) {
         return false;
       },
       run: (dispatch, getState, action) => {
+        mark(`${type}_end`);
+        measure(`waitForDispatch_${type}`, `${type}_start`, `${type}_end`);
         resolve(action);
       },
     });