diff --git a/src/app/service/agent/core/tools/tab_tools.ts b/src/app/service/agent/core/tools/tab_tools.ts
index b926a8a96..0e82ecb9f 100644
--- a/src/app/service/agent/core/tools/tab_tools.ts
+++ b/src/app/service/agent/core/tools/tab_tools.ts
@@ -310,7 +310,7 @@ export function createTabTools(deps: {
       const tab = await chrome.tabs.update(tabId, { active: true });
       if (!tab) throw new Error(`Tab ${tabId} not found`);
       // 也激活对应窗口
-      if (tab.windowId) {
+      if (tab.windowId && Number.isFinite(tab.windowId) && tab.windowId >= 0) {
         await chrome.windows.update(tab.windowId, { focused: true });
       }
       return JSON.stringify({
diff --git a/src/app/service/agent/service_worker/dom.ts b/src/app/service/agent/service_worker/dom.ts
index b280d9e61..df0f6d951 100644
--- a/src/app/service/agent/service_worker/dom.ts
+++ b/src/app/service/agent/service_worker/dom.ts
@@ -150,6 +150,9 @@ export class AgentDomService {
   private async captureVisibleTab(tabId: number, options?: ScreenshotOptions): Promise<string> {
     const quality = options?.quality ?? 80;
     const tab = await chrome.tabs.get(tabId);
+    if (!tab || !Number.isFinite(tab.windowId) || tab.windowId < 0) {
+      throw new Error(`No windowId for tab ${tabId}`);
+    }
     return chrome.tabs.captureVisibleTab(tab.windowId, {
       format: "jpeg",
       quality,
diff --git a/src/app/service/service_worker/gm_api/gm_api.test.ts b/src/app/service/service_worker/gm_api/gm_api.test.ts
index 7617e3fa6..04aafd41a 100644
--- a/src/app/service/service_worker/gm_api/gm_api.test.ts
+++ b/src/app/service/service_worker/gm_api/gm_api.test.ts
@@ -1,4 +1,4 @@
-import { describe, it, expect } from "vitest";
+import { describe, it, expect, vi } from "vitest";
 import { type IGetSender } from "@Packages/message/server";
 import { type ExtMessageSender } from "@Packages/message/types";
 import GMApi, { ConnectMatch, getConnectMatched, getExtensionSiteAccessOriginPattern } from "./gm_api";
@@ -119,6 +119,27 @@ describe.concurrent("GM API 注册完整性", () => {
   });
 });
 
+describe("window.focus", () => {
+  it("应同时激活标签页并将其所在窗口置于前台", async () => {
+    const tabsUpdate = vi.fn().mockResolvedValue(undefined);
+    const windowsUpdate = vi.fn().mockResolvedValue(undefined);
+    const originalChrome = globalThis.chrome;
+    vi.stubGlobal("chrome", {
+      ...originalChrome,
+      tabs: { ...originalChrome.tabs, update: tabsUpdate },
+      windows: { ...originalChrome.windows, update: windowsUpdate },
+    });
+    const sender = makeSender();
+    sender.getSender = () => ({ tab: { id: 42, windowId: 7 } as chrome.tabs.Tab });
+
+    await GMApi.prototype["window.focus"]({} as GMApiRequest<void>, sender);
+
+    expect(tabsUpdate).toHaveBeenCalledWith(42, { active: true });
+    expect(windowsUpdate).toHaveBeenCalledWith(7, { focused: true });
+    vi.stubGlobal("chrome", originalChrome);
+  });
+});
+
 describe.concurrent("getExtensionSiteAccessOriginPattern", () => {
   it.concurrent("应生成不带端口的扩展站点访问权限 pattern", () => {
     expect(getExtensionSiteAccessOriginPattern(new URL("http://127.0.0.1:3000/get"))).toBe("http://127.0.0.1/*");
diff --git a/src/app/service/service_worker/gm_api/gm_api.ts b/src/app/service/service_worker/gm_api/gm_api.ts
index 31eaae2c9..0d174a100 100644
--- a/src/app/service/service_worker/gm_api/gm_api.ts
+++ b/src/app/service/service_worker/gm_api/gm_api.ts
@@ -1497,11 +1497,17 @@ export default class GMApi {
 
   @PermissionVerify.API()
   async ["window.focus"](request: GMApiRequest<void>, sender: IGetSender) {
-    const tabId = sender.getSender()?.tab?.id;
+    const tab = sender.getSender()?.tab;
+    const tabId = tab?.id;
     if (Number.isFinite(tabId)) {
       await chrome.tabs.update(tabId as number, {
         active: true,
       });
+      if (tab && Number.isFinite(tab.windowId) && tab.windowId >= 0) {
+        await chrome.windows.update(tab.windowId as number, {
+          focused: true,
+        });
+      }
     }
   }