diff --git a/lighthouse-core/report/html/renderer/report-renderer.js b/lighthouse-core/report/html/renderer/report-renderer.js
index 72f1711fd526..cb013ef06347 100644
--- a/lighthouse-core/report/html/renderer/report-renderer.js
+++ b/lighthouse-core/report/html/renderer/report-renderer.js
@@ -208,7 +208,7 @@ class ReportRenderer {
 
     // Fireworks
     const scoresAll100 = report.reportCategories.every(cat => cat.score === 1);
-    if (scoresAll100) {
+    if (!this._dom.isDevTools() && scoresAll100) {
       headerContainer.classList.add('score100');
       this._dom.find('.lh-header', headerContainer).addEventListener('click', _ => {
         headerContainer.classList.toggle('fireworks-paused');