diff --git a/backend/controller/remoteBrowser.go b/backend/controller/remoteBrowser.go
index ecdd8a6..0167ff3 100644
--- a/backend/controller/remoteBrowser.go
+++ b/backend/controller/remoteBrowser.go
@@ -370,6 +370,10 @@ func (m *RemoteBrowserController) RunByID(g *gin.Context) {
 		}
 	}()
 
+	// NoKeepAlive=true so keepAlive() in test scripts returns immediately instead
+	// of parking the browser — closing the test panel must always stop cleanly.
+	runner.NoKeepAlive = true
+
 	// Run the script in a goroutine; Events channel is closed when done.
 	go runner.Run(ctx) //nolint:errcheck
 
diff --git a/backend/remotebrowser/runner.go b/backend/remotebrowser/runner.go
index 819fe55..425af31 100644
--- a/backend/remotebrowser/runner.go
+++ b/backend/remotebrowser/runner.go
@@ -72,6 +72,10 @@ type Runner struct {
 	// ExecPath is the server-configured Chrome binary path (from config.json,
 	// not user-supplied). Empty = Rod auto-download.
 	ExecPath string
+	// NoKeepAlive disables the keepAlive() parking behaviour. When true,
+	// keepAlive() returns immediately so the script exits normally. Used by
+	// the test runner to prevent leaking browsers when the test panel closes.
+	NoKeepAlive bool
 	Events   chan RunEvent    // server → client
 	Incoming chan IncomingMsg // client → script (victim events / test injections)
 	// BrowserCh receives the *rod.Page as soon as newSession() spawns the browser.
@@ -386,6 +390,10 @@ func (r *Runner) Run(ctx context.Context) error {
 		// is available for streaming. It blocks until the runner context
 		// is cancelled (e.g. the admin closes the live session).
 		session.Set("keepAlive", func(call goja.FunctionCall) goja.Value {
+			if r.NoKeepAlive {
+				emitter.log("[session] keepAlive skipped (test mode)")
+				return goja.Undefined()
+			}
 			emitter.log("[session] keeping alive for remote takeover")
 			select {
 			case r.LiveCh <- page: