diff --git a/tests/browser/typeahead.spec.mjs b/tests/browser/typeahead.spec.mjs
index 278f309d63..7efbac1bc7 100644
--- a/tests/browser/typeahead.spec.mjs
+++ b/tests/browser/typeahead.spec.mjs
@@ -1,6 +1,25 @@
-import { test, expect } from "./source-fixture.mjs";
+import { test, expect } from "./playwright-test.mjs";
+import { previewFixtures } from "./vite-server.mjs";
 import { watchPageErrors } from "./page-errors.mjs";
 
+let fixtures;
+// A dev server serves these fixtures as about 1,600 modules, and a worker's
+// first navigation outlasted the navigation timeout on a busy runner.
+test.beforeAll(async () => {
+  fixtures = await previewFixtures([
+    "tests/fixtures/emoji.html",
+    "tests/fixtures/mentions.html",
+    "tests/fixtures/messages.html",
+    "tests/fixtures/typeahead.html",
+  ]);
+});
+test.afterAll(() => fixtures?.close());
+// Journeys open the pages by path. The bundle's port is known only after
+// beforeAll, which runs before each test's fixtures. Playwright also resolves
+// baseURL for beforeAll itself, before the bundle exists.
+// biome-ignore lint/correctness/noEmptyPattern: Playwright requires a destructured fixture argument.
+test.use({ baseURL: async ({}, use) => use(fixtures?.origin) });
+
 const open = async (page) => {
   await page.goto("/tests/fixtures/mentions.html?test-controls");
   return page.getByRole("textbox", { name: "Message #General" });
diff --git a/tests/browser/vite-server.mjs b/tests/browser/vite-server.mjs
index 9caa841733..8c52306b8c 100644
--- a/tests/browser/vite-server.mjs
+++ b/tests/browser/vite-server.mjs
@@ -136,6 +136,49 @@ export const preview = (config) =>
     }),
   );
 
+// A dev server transforms a page's modules on first request, so a worker's
+// first navigation to a large fixture can outlast the navigation timeout on a
+// busy runner. This builds the repository-relative pages once and serves the
+// bundle. Development React, as a dev server serves, keeps StrictMode's checks.
+// close() stops the server and removes the build.
+export async function previewFixtures(pages) {
+  const directory = await mkdtemp(join(tmpdir(), "buzz-fixture-preview-"));
+  try {
+    const config = {
+      root,
+      configFile: false,
+      envDir: false,
+      logLevel: "error",
+      plugins: [react()],
+      define: {
+        "import.meta.env.DEV": "true",
+        "process.env.NODE_ENV": '"development"',
+      },
+      build: {
+        rollupOptions: { input: pages.map((page) => join(root, page)) },
+        outDir: join(directory, "dist"),
+        emptyOutDir: true,
+        target: "esnext",
+      },
+    };
+    await build(config);
+    const server = await preview({
+      ...config,
+      preview: { host: "127.0.0.1", port: 0, strictPort: true },
+    });
+    return {
+      origin: `http://127.0.0.1:${server.httpServer.address().port}`,
+      async close() {
+        await new Promise((resolve) => server.httpServer.close(resolve));
+        await rm(directory, { recursive: true, force: true });
+      },
+    };
+  } catch (error) {
+    await rm(directory, { recursive: true, force: true });
+    throw error;
+  }
+}
+
 // Run once per test run, before any test: it scans and bundles the fixture
 // dependencies so no server does that work inside a navigation budget.
 export async function prepareFixtureDependencies() {
diff --git a/tests/browser/voice-notes.spec.mjs b/tests/browser/voice-notes.spec.mjs
index b796f231b1..f47dd49cb7 100644
--- a/tests/browser/voice-notes.spec.mjs
+++ b/tests/browser/voice-notes.spec.mjs
@@ -1,49 +1,13 @@
 import { watchPageErrors } from "./page-errors.mjs";
 import { test, expect } from "./playwright-test.mjs";
-import { build, preview } from "./vite-server.mjs";
-import react from "@vitejs/plugin-react";
-import { mkdtemp, rm } from "node:fs/promises";
-import { tmpdir } from "node:os";
-import { join } from "node:path";
-import { fileURLToPath } from "node:url";
-let server, directory, url;
-// A dev server serves this fixture as about 800 modules. On a busy runner,
-// WebKit's first navigation took longer than the navigation timeout to load
-// them, so build the page once and serve the bundle.
+import { previewFixtures } from "./vite-server.mjs";
+let fixtures;
+// A dev server serves this fixture as about 800 modules, and WebKit's first
+// navigation outlasted the navigation timeout on a busy runner.
 test.beforeAll(async () => {
-  const root = fileURLToPath(new URL("../../", import.meta.url));
-  directory = await mkdtemp(join(tmpdir(), "buzz-voice-notes-"));
-  const config = {
-    root,
-    configFile: false,
-    envDir: false,
-    logLevel: "error",
-    plugins: [react()],
-    // Development React, as the dev server served, keeps StrictMode's checks.
-    define: {
-      "import.meta.env.DEV": "true",
-      "process.env.NODE_ENV": '"development"',
-    },
-    build: {
-      rollupOptions: {
-        input: join(root, "tests/fixtures/voice-notes.html"),
-      },
-      outDir: join(directory, "dist"),
-      emptyOutDir: true,
-      target: "esnext",
-    },
-  };
-  await build(config);
-  server = await preview({
-    ...config,
-    preview: { host: "127.0.0.1", port: 0, strictPort: true },
-  });
-  url = `http://127.0.0.1:${server.httpServer.address().port}/tests/fixtures/voice-notes.html`;
-});
-test.afterAll(async () => {
-  if (server) await new Promise((resolve) => server.httpServer.close(resolve));
-  if (directory) await rm(directory, { recursive: true, force: true });
+  fixtures = await previewFixtures(["tests/fixtures/voice-notes.html"]);
 });
+test.afterAll(() => fixtures?.close());
 test.beforeEach(async ({ page }) => {
   await page.route("**/api/relay/media?*", async (route) => {
     const url = new URL(route.request().url()).searchParams.get("url");
@@ -59,7 +23,7 @@ test.beforeEach(async ({ page }) => {
       body: Buffer.from(bytes),
     });
   });
-  await page.goto(url);
+  await page.goto(`${fixtures.origin}/tests/fixtures/voice-notes.html`);
   await page.evaluate(() => {
     const mic = {
       mode: "allow",