diff --git a/packages/playwright-core/src/server/firefox/ffPage.ts b/packages/playwright-core/src/server/firefox/ffPage.ts
index 49435823c2..77fcd480bb 100644
--- a/packages/playwright-core/src/server/firefox/ffPage.ts
+++ b/packages/playwright-core/src/server/firefox/ffPage.ts
@@ -251,7 +251,8 @@ export class FFPage implements PageDelegate {
     const context = this._contextIdToContext.get(executionContextId);
     if (!context)
       return;
-    this._page._addConsoleMessage(type, args.map(arg => context.createHandle(arg)), location);
+    // Juggler reports 'warn' for some internal messages generated by the browser.
+    this._page._addConsoleMessage(type === 'warn' ? 'warning' : type, args.map(arg => context.createHandle(arg)), location);
   }
 
   _onDialogOpened(params: Protocol.Page.dialogOpenedPayload) {