diff --git a/tests/config/default.config.ts b/tests/config/default.config.ts
index 7cafef050b..7e88194311 100644
--- a/tests/config/default.config.ts
+++ b/tests/config/default.config.ts
@@ -52,6 +52,8 @@ const serverEnv = new ServerEnv();
 const browsers = ['chromium', 'webkit', 'firefox'] as BrowserName[];
 for (const browserName of browsers) {
   const executablePath = getExecutablePath(browserName);
+  if (executablePath && (process.env.FOLIO_WORKER_INDEX === undefined || process.env.FOLIO_WORKER_INDEX === ''))
+    console.error(`Using executable at ${executablePath}`);
   const mode = (process.env.PWMODE || 'default') as ('default' | 'driver' | 'service');
   const options = {
     mode,
diff --git a/tests/folio/src/dispatcher.ts b/tests/folio/src/dispatcher.ts
index 18c4b7ca3b..5bd64eb04f 100644
--- a/tests/folio/src/dispatcher.ts
+++ b/tests/folio/src/dispatcher.ts
@@ -349,6 +349,7 @@ class Worker extends EventEmitter {
       env: {
         FORCE_COLOR: process.stdout.isTTY ? '1' : '0',
         DEBUG_COLORS: process.stdout.isTTY ? '1' : '0',
+        FOLIO_WORKER_INDEX: String(this.index),
         ...process.env
       },
       // Can't pipe since piping slows down termination for some reason.