diff --git a/scripts/e2e.config.ts b/scripts/e2e.config.ts
index 989d63326a..3a9425d6eb 100644
--- a/scripts/e2e.config.ts
+++ b/scripts/e2e.config.ts
@@ -186,7 +186,7 @@ export default {
   ],
   // One server holds every test's state, and a dev stack is heavy.
   workers: 1,
-  timeout: 300_000,
+  timeout: 600_000,
   assertionTimeout: 15_000,
   video: "on",
   trace: "on",
diff --git a/scripts/scenarios/start-app.ts b/scripts/scenarios/start-app.ts
index 5dee3f26c1..04939a3f72 100644
--- a/scripts/scenarios/start-app.ts
+++ b/scripts/scenarios/start-app.ts
@@ -126,6 +126,11 @@ const startApp = Effect.fn("startApp")(function* (input: {
   const checkout = yield* HostProcess.WorkingDirectory;
   const hostEnvironment = yield* HostProcess.Environment;
   yield* prepareHome(input.home);
+  if (hostEnvironment.T3_SCENARIO_BROWSER_CACHE) {
+    const browserRoot = path.join(input.home, "tools/chrome-headless-shell/linux64/157.0.8103.78");
+    yield* fs.makeDirectory(path.dirname(browserRoot), { recursive: true });
+    yield* fs.copy(hostEnvironment.T3_SCENARIO_BROWSER_CACHE, browserRoot);
+  }
   const env = {
     ...hostEnvironment,
     PATH: `${path.join(input.home, "bin")}:${hostEnvironment.PATH ?? ""}`,