diff --git a/extensions/browser/src/browser/chrome.default-browser.test.ts b/extensions/browser/src/browser/chrome.default-browser.test.ts
index 324bbb62731..a02f26986ef 100644
--- a/extensions/browser/src/browser/chrome.default-browser.test.ts
+++ b/extensions/browser/src/browser/chrome.default-browser.test.ts
@@ -1,4 +1,4 @@
-import { beforeEach, describe, expect, it, vi } from "vitest";
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
 
 vi.mock("node:child_process", () => ({
   execFileSync: vi.fn(),
@@ -24,17 +24,10 @@ import { execFileSync } from "node:child_process";
 import * as fs from "node:fs";
 import os from "node:os";
 
-async function loadResolveBrowserExecutableForPlatform() {
-  const mod = await import("./chrome.executables.js");
-  return mod.resolveBrowserExecutableForPlatform;
-}
-
 describe("browser default executable detection", () => {
   const launchServicesPlist = "com.apple.launchservices.secure.plist";
   const chromeExecutablePath = "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome";
-  let resolveBrowserExecutableForPlatform: Awaited<
-    ReturnType<typeof loadResolveBrowserExecutableForPlatform>
-  >;
+  let resolveBrowserExecutableForPlatform: typeof import("./chrome.executables.js").resolveBrowserExecutableForPlatform;
 
   function mockMacDefaultBrowser(bundleId: string, appPath = ""): void {
     vi.mocked(execFileSync).mockImplementation((cmd, args) => {
@@ -62,11 +55,13 @@ describe("browser default executable detection", () => {
     });
   }
 
-  beforeEach(async () => {
-    vi.resetModules();
+  beforeAll(async () => {
+    ({ resolveBrowserExecutableForPlatform } = await import("./chrome.executables.js"));
+  });
+
+  beforeEach(() => {
     vi.clearAllMocks();
     vi.mocked(os.homedir).mockReturnValue("/Users/test");
-    resolveBrowserExecutableForPlatform = await loadResolveBrowserExecutableForPlatform();
   });
 
   it("prefers default Chromium browser on macOS", async () => {
@@ -119,8 +114,6 @@ describe("browser default executable detection", () => {
       // return Chrome from the fallback list — not Edge — failing the assert.
       return value === edgeExecutablePath || value.includes(chromeExecutablePath);
     });
-    const resolveBrowserExecutableForPlatform = await loadResolveBrowserExecutableForPlatform();
-
     const exe = resolveBrowserExecutableForPlatform(
       {} as Parameters<typeof resolveBrowserExecutableForPlatform>[0],
       "darwin",
@@ -144,8 +137,6 @@ describe("browser default executable detection", () => {
       return "";
     });
     mockChromeExecutableExists();
-    const resolveBrowserExecutableForPlatform = await loadResolveBrowserExecutableForPlatform();
-
     const exe = resolveBrowserExecutableForPlatform(
       {} as Parameters<typeof resolveBrowserExecutableForPlatform>[0],
       "darwin",
diff --git a/extensions/browser/src/browser/routes/basic.existing-session.test.ts b/extensions/browser/src/browser/routes/basic.existing-session.test.ts
index d6f034366c0..32179aa5bd6 100644
--- a/extensions/browser/src/browser/routes/basic.existing-session.test.ts
+++ b/extensions/browser/src/browser/routes/basic.existing-session.test.ts
@@ -1,4 +1,4 @@
-import { beforeEach, describe, expect, it, vi } from "vitest";
+import { beforeAll, describe, expect, it, vi } from "vitest";
 import { createBrowserRouteApp, createBrowserRouteResponse } from "./test-helpers.js";
 
 vi.mock("../chrome-mcp.js", () => ({
@@ -52,8 +52,7 @@ async function callBasicRouteWithState(params: {
   return response;
 }
 
-beforeEach(async () => {
-  vi.resetModules();
+beforeAll(async () => {
   ({ BrowserProfileUnavailableError } = await import("../errors.js"));
   ({ registerBrowserBasicRoutes } = await import("./basic.js"));
 });