diff --git a/apps/web/src/components/preview/PreviewMoreMenu.tsx b/apps/web/src/components/preview/PreviewMoreMenu.tsx
index 7080fb5238f4..3972895941ae 100644
--- a/apps/web/src/components/preview/PreviewMoreMenu.tsx
+++ b/apps/web/src/components/preview/PreviewMoreMenu.tsx
@@ -52,6 +52,8 @@ interface Props {
   nativePictureInPicture: boolean;
   /** Toggles the optional native always-on-top preview window. */
   onNativePictureInPicture: () => void;
+  /** Opens the current page in the OS default browser. */
+  onOpenInBrowser: () => void;
   /** Environment the tab belongs to; scopes storage clearing to its partitions. */
   environmentId: EnvironmentId;
   /** Profile the tab was opened under, if the server recorded one. */
@@ -79,6 +81,7 @@ export function PreviewMoreMenu({
   onToggleDeviceToolbar,
   nativePictureInPicture,
   onNativePictureInPicture,
+  onOpenInBrowser,
   environmentId,
   profileId,
   profileName,
@@ -120,6 +123,9 @@ export function PreviewMoreMenu({
             ? "Close separate preview window"
             : "Open separate preview window"}
         </MenuItem>
+        <MenuItem onClick={onOpenInBrowser} disabled={tabDisabled}>
+          Open in system browser
+        </MenuItem>
         <MenuItem onClick={onToggleDeviceToolbar} disabled={tabDisabled}>
           {deviceToolbarVisible ? "Hide device toolbar" : "Show device toolbar"}
         </MenuItem>
diff --git a/apps/web/src/components/preview/PreviewView.test.tsx b/apps/web/src/components/preview/PreviewView.test.tsx
index 2a146834012e..053d9a95457f 100644
--- a/apps/web/src/components/preview/PreviewView.test.tsx
+++ b/apps/web/src/components/preview/PreviewView.test.tsx
@@ -11,6 +11,16 @@ import { act, Profiler } from "react";
 import { renderToStaticMarkup } from "react-dom/server";
 import { beforeEach, describe, expect, it, vi } from "vite-plus/test";
 
+// PreviewView resolves the local API once at module scope behind a `typeof
+// window` guard. The guard has to see a window before the import further down
+// runs, or every shell call in this suite is a silent no-op.
+vi.hoisted(() => {
+  globalThis.window ??= {
+    addEventListener() {},
+    removeEventListener() {},
+  } as unknown as Window & typeof globalThis;
+});
+
 const mocks = vi.hoisted(() => ({
   navigate: vi.fn(async (_tabId: string, _url: string): Promise<void> => undefined),
   rememberPreviewUrl: vi.fn(),
@@ -19,6 +29,8 @@ const mocks = vi.hoisted(() => ({
   emptyStateUrl: null as ((url: string) => void) | null,
   togglePictureInPicture: null as (() => void) | null,
   toggleNativePictureInPicture: null as (() => void) | null,
+  openInBrowser: null as (() => void) | null,
+  openExternal: vi.fn(async (_url: string): Promise<void> => undefined),
   pictureInPicturePressed: false,
   miniPlayerTabId: null as string | null,
   openMiniPlayer: vi.fn(),
@@ -95,7 +107,7 @@ vi.mock("~/lib/previewAnnotation", () => ({
 }));
 
 vi.mock("~/localApi", () => ({
-  ensureLocalApi: vi.fn(),
+  ensureLocalApi: vi.fn(() => ({ shell: { openExternal: mocks.openExternal } })),
 }));
 
 vi.mock("~/previewStateStore", () => ({
@@ -221,7 +233,7 @@ vi.mock("./PreviewChromeRow", () => ({
     onPictureInPicture?: () => void;
     pictureInPicture?: boolean;
     trailingActions?: {
-      props: { onNativePictureInPicture?: () => void };
+      props: { onNativePictureInPicture?: () => void; onOpenInBrowser?: () => void };
     };
   }) => {
     mocks.submittedUrl = props.onSubmit;
@@ -229,6 +241,7 @@ vi.mock("./PreviewChromeRow", () => ({
     mocks.togglePictureInPicture = props.onPictureInPicture ?? null;
     mocks.toggleNativePictureInPicture =
       props.trailingActions?.props.onNativePictureInPicture ?? null;
+    mocks.openInBrowser = props.trailingActions?.props.onOpenInBrowser ?? null;
     mocks.pictureInPicturePressed = props.pictureInPicture ?? false;
     return null;
   },
@@ -333,6 +346,8 @@ describe("PreviewView navigation", () => {
     mocks.emptyStateUrl = null;
     mocks.togglePictureInPicture = null;
     mocks.toggleNativePictureInPicture = null;
+    mocks.openInBrowser = null;
+    mocks.openExternal.mockClear();
     mocks.pictureInPicturePressed = false;
     mocks.miniPlayerTabId = null;
     mocks.openMiniPlayer.mockClear();
@@ -519,6 +534,27 @@ describe("PreviewView navigation", () => {
     );
   });
 
+  it("hands the page the tab is showing to the system browser", async () => {
+    const props = {
+      threadRef: TEST_THREAD_REF,
+      tabId: "tab-1",
+      visible: true,
+    } as const;
+
+    renderToStaticMarkup(<PreviewView {...props} />);
+    mocks.openInBrowser?.();
+    await vi.waitFor(() => expect(mocks.openExternal).toHaveBeenCalledWith("http://example.com/"));
+
+    // An empty tab has no address to hand over; the menu item stays clickable,
+    // so the handler is the only thing keeping it from opening about:blank.
+    mocks.showEmptyState = true;
+    mocks.openExternal.mockClear();
+    renderToStaticMarkup(<PreviewView {...props} />);
+    expect(mocks.openInBrowser).not.toBeNull();
+    mocks.openInBrowser?.();
+    expect(mocks.openExternal).not.toHaveBeenCalled();
+  });
+
   it("forwards Cmd/Ctrl+Enter annotations to the composer send path", async () => {
     const annotation = {
       id: "annotation-1",
diff --git a/apps/web/src/components/preview/PreviewView.tsx b/apps/web/src/components/preview/PreviewView.tsx
index e6ad2758bc48..e91838189b06 100644
--- a/apps/web/src/components/preview/PreviewView.tsx
+++ b/apps/web/src/components/preview/PreviewView.tsx
@@ -767,6 +767,7 @@ export function PreviewView({
               onToggleDeviceToolbar={handleToggleDeviceToolbar}
               nativePictureInPicture={desktopOverlay?.pictureInPicture ?? false}
               onNativePictureInPicture={handleNativePictureInPicture}
+              onOpenInBrowser={handleOpenInBrowser}
             />
           ) : null
         }