diff --git a/apps/web/src/components/preview/PreviewChromeRow.composition.browser.test.tsx b/apps/web/src/components/preview/PreviewChromeRow.composition.browser.test.tsx
new file mode 100644
index 0000000000000..c307a46f0a660
--- /dev/null
+++ b/apps/web/src/components/preview/PreviewChromeRow.composition.browser.test.tsx
@@ -0,0 +1,43 @@
+import { createRef } from "react";
+import { expect, it, vi } from "vite-plus/test";
+import { page, userEvent } from "vite-plus/test/browser";
+
+import { act, render } from "../../../test/render";
+import { PreviewChromeRow } from "./PreviewChromeRow";
+
+it("ignores composing keys in the address bar", async () => {
+  const onSubmit = vi.fn();
+  await using _screen = await render(
+    <PreviewChromeRow
+      url="https://example.com/"
+      loading={false}
+      canGoBack={false}
+      canGoForward={false}
+      refreshDisabled={false}
+      urlInputRef={createRef()}
+      onBack={() => {}}
+      onForward={() => {}}
+      onRefresh={() => {}}
+      onSubmit={onSubmit}
+    />,
+  );
+  const input = page.getByRole("textbox", { name: "Search or enter URL" });
+  await input.fill("東京");
+
+  for (const composition of [
+    { key: "Enter", isComposing: true, keyCode: 13 },
+    { key: "Enter", isComposing: false, keyCode: 229 },
+    { key: "Escape", isComposing: true, keyCode: 27 },
+    { key: "Escape", isComposing: false, keyCode: 229 },
+  ]) {
+    const event = new KeyboardEvent("keydown", { ...composition, bubbles: true, cancelable: true });
+    await act(() => input.element().dispatchEvent(event));
+    if (composition.key === "Enter") expect(event.defaultPrevented).toBe(true);
+    await expect.element(input).toHaveValue("東京");
+    await expect.element(input).toHaveFocus();
+  }
+  expect(onSubmit).not.toHaveBeenCalled();
+
+  await userEvent.keyboard("{Enter}");
+  expect(onSubmit).toHaveBeenCalledExactlyOnceWith("東京");
+});
diff --git a/apps/web/src/components/preview/PreviewChromeRow.tsx b/apps/web/src/components/preview/PreviewChromeRow.tsx
index d8202a4064e1e..4faf9e5c0f94e 100644
--- a/apps/web/src/components/preview/PreviewChromeRow.tsx
+++ b/apps/web/src/components/preview/PreviewChromeRow.tsx
@@ -167,6 +167,10 @@ export function PreviewChromeRow({
                     setInputFocused(false);
                   }}
                   onKeyDown={(event) => {
+                    if (event.nativeEvent.isComposing || event.keyCode === 229) {
+                      if (event.key === "Enter") event.preventDefault();
+                      return;
+                    }
                     if (event.key === "Enter") submit(event);
                     if (event.key === "Escape") {
                       event.preventDefault();