diff --git a/background.js b/background.js
index 0f5aea1..8c8eb1c 100644
--- a/background.js
+++ b/background.js
@@ -269,6 +269,7 @@ const PERSISTED_SETTING_DEFAULTS = {
   accountRunHistoryHelperBaseUrl: DEFAULT_ACCOUNT_RUN_HISTORY_HELPER_BASE_URL,
   gmailBaseEmail: '',
   mail2925BaseEmail: '',
+  currentMail2925AccountId: '',
   emailPrefix: '',
   inbucketHost: '',
   inbucketMailbox: '',
@@ -903,6 +904,7 @@ function normalizePersistentSettingValue(key, value) {
       return normalizeAccountRunHistoryHelperBaseUrl(value);
     case 'gmailBaseEmail':
     case 'mail2925BaseEmail':
+    case 'currentMail2925AccountId':
     case 'emailPrefix':
       return String(value || '').trim();
     case 'inbucketHost':
diff --git a/background/mail-2925-session.js b/background/mail-2925-session.js
index c78a350..07ab952 100644
--- a/background/mail-2925-session.js
+++ b/background/mail-2925-session.js
@@ -186,6 +186,7 @@
         await syncMail2925Accounts(accounts.map((item) => (item.id === account.id ? nextAccount : item)));
       }
 
+      await setPersistentSettings({ currentMail2925AccountId: nextAccount.id });
       await setState({ currentMail2925AccountId: nextAccount.id });
       broadcastDataUpdate({ currentMail2925AccountId: nextAccount.id });
       if (logMessage) {
@@ -210,6 +211,7 @@
       await syncMail2925Accounts(accounts.map((item) => (item.id === account.id ? nextAccount : item)));
 
       if (state.currentMail2925AccountId === account.id && nextAccount.enabled === false) {
+        await setPersistentSettings({ currentMail2925AccountId: '' });
         await setState({ currentMail2925AccountId: null });
         broadcastDataUpdate({ currentMail2925AccountId: null });
       }
@@ -224,6 +226,7 @@
       await syncMail2925Accounts(nextAccounts);
 
       if (state.currentMail2925AccountId === accountId) {
+        await setPersistentSettings({ currentMail2925AccountId: '' });
         await setState({ currentMail2925AccountId: null });
         broadcastDataUpdate({ currentMail2925AccountId: null });
       }
@@ -239,6 +242,7 @@
       await syncMail2925Accounts(nextAccounts);
 
       if (state.currentMail2925AccountId && !findMail2925Account(nextAccounts, state.currentMail2925AccountId)) {
+        await setPersistentSettings({ currentMail2925AccountId: '' });
         await setState({ currentMail2925AccountId: null });
         broadcastDataUpdate({ currentMail2925AccountId: null });
       }
@@ -613,6 +617,7 @@
       });
 
       if (!nextAccount) {
+        await setPersistentSettings({ currentMail2925AccountId: '' });
         await setState({ currentMail2925AccountId: null });
         broadcastDataUpdate({ currentMail2925AccountId: null });
         if (typeof requestStop === 'function') {
diff --git a/sidepanel/sidepanel.js b/sidepanel/sidepanel.js
index 37a6d3e..430444d 100644
--- a/sidepanel/sidepanel.js
+++ b/sidepanel/sidepanel.js
@@ -1485,6 +1485,7 @@ function collectSettingsPayload() {
     mailProvider: selectMailProvider.value,
     mail2925Mode: getSelectedMail2925Mode(),
     mail2925UseAccountPool,
+    currentMail2925AccountId: String(latestState?.currentMail2925AccountId || '').trim(),
     emailGenerator: selectEmailGenerator.value,
     autoDeleteUsedIcloudAlias: checkboxAutoDeleteIcloud?.checked,
     icloudHostPreference: selectIcloudHostPreference?.value || 'auto',
diff --git a/tests/background-mail2925-session-module.test.js b/tests/background-mail2925-session-module.test.js
index 19188a7..331bf45 100644
--- a/tests/background-mail2925-session-module.test.js
+++ b/tests/background-mail2925-session-module.test.js
@@ -294,3 +294,46 @@ test('handleMail2925LimitReachedError stops immediately when account pool is off
   assert.equal(events.stopCalls.length, 1);
   assert.equal(currentState.currentMail2925AccountId, 'current');
 });
+
+test('setCurrentMail2925Account persists currentMail2925AccountId for browser restart restore', async () => {
+  const source = fs.readFileSync('background/mail-2925-session.js', 'utf8');
+  const globalScope = {};
+  const api = new Function('self', `${source}; return self.MultiPageBackgroundMail2925Session;`)(globalScope);
+
+  let currentState = {
+    mail2925Accounts: mail2925Utils.normalizeMail2925Accounts([
+      { id: 'acc-1', email: 'acc1@2925.com', password: 'p1', enabled: true, lastUsedAt: 10 },
+    ]),
+    currentMail2925AccountId: null,
+  };
+  const persistedUpdates = [];
+
+  const manager = api.createMail2925SessionManager({
+    addLog: async () => {},
+    broadcastDataUpdate: () => {},
+    chrome: {},
+    findMail2925Account: mail2925Utils.findMail2925Account,
+    getMail2925AccountStatus: mail2925Utils.getMail2925AccountStatus,
+    getState: async () => currentState,
+    isMail2925AccountAvailable: mail2925Utils.isMail2925AccountAvailable,
+    MAIL2925_LIMIT_COOLDOWN_MS: mail2925Utils.MAIL2925_LIMIT_COOLDOWN_MS,
+    normalizeMail2925Account: mail2925Utils.normalizeMail2925Account,
+    normalizeMail2925Accounts: mail2925Utils.normalizeMail2925Accounts,
+    pickMail2925AccountForRun: mail2925Utils.pickMail2925AccountForRun,
+    setPersistentSettings: async (payload) => {
+      persistedUpdates.push(payload);
+    },
+    setState: async (updates) => {
+      currentState = { ...currentState, ...updates };
+    },
+    throwIfStopped: () => {},
+    upsertMail2925AccountInList: mail2925Utils.upsertMail2925AccountInList,
+  });
+
+  await manager.setCurrentMail2925Account('acc-1');
+
+  assert.equal(currentState.currentMail2925AccountId, 'acc-1');
+  assert.deepStrictEqual(persistedUpdates, [
+    { currentMail2925AccountId: 'acc-1' },
+  ]);
+});
diff --git a/tests/sidepanel-mail2925-base-email.test.js b/tests/sidepanel-mail2925-base-email.test.js
index 340534d..5e24210 100644
--- a/tests/sidepanel-mail2925-base-email.test.js
+++ b/tests/sidepanel-mail2925-base-email.test.js
@@ -142,3 +142,73 @@ return {
   assert.equal(api.getLatestState().mail2925BaseEmail, 'new@2925.com');
   assert.equal(api.getSaveCalls(), 1);
 });
+
+test('collectSettingsPayload persists currentMail2925AccountId for 2925 account pool restore', () => {
+  const bundle = [
+    extractFunction('collectSettingsPayload'),
+  ].join('\n');
+
+  const api = new Function(`
+let latestState = {
+  contributionMode: false,
+  mail2925UseAccountPool: true,
+  currentMail2925AccountId: 'acc-2',
+};
+let cloudflareDomainEditMode = false;
+let cloudflareTempEmailDomainEditMode = false;
+const selectCfDomain = { value: 'example.com' };
+const selectTempEmailDomain = { value: 'mail.example.com' };
+const selectPanelMode = { value: 'cpa' };
+const inputVpsUrl = { value: '' };
+const inputVpsPassword = { value: '' };
+const inputSub2ApiUrl = { value: '' };
+const inputSub2ApiEmail = { value: '' };
+const inputSub2ApiPassword = { value: '' };
+const inputSub2ApiGroup = { value: '' };
+const inputSub2ApiDefaultProxy = { value: '' };
+const inputPassword = { value: '' };
+const selectMailProvider = { value: '2925' };
+const selectEmailGenerator = { value: 'duck' };
+const checkboxAutoDeleteIcloud = { checked: false };
+const selectIcloudHostPreference = { value: 'auto' };
+const inputAccountRunHistoryTextEnabled = { checked: false };
+const inputAccountRunHistoryHelperBaseUrl = { value: '' };
+const inputMail2925UseAccountPool = { checked: true };
+const inputInbucketHost = { value: '' };
+const inputInbucketMailbox = { value: '' };
+const inputLuckmailApiKey = { value: '' };
+const inputLuckmailBaseUrl = { value: '' };
+const selectLuckmailEmailType = { value: 'ms_graph' };
+const inputLuckmailDomain = { value: '' };
+const inputTempEmailBaseUrl = { value: '' };
+const inputTempEmailAdminAuth = { value: '' };
+const inputTempEmailCustomAuth = { value: '' };
+const inputTempEmailReceiveMailbox = { value: '' };
+function getCloudflareDomainsFromState() {
+  return { domains: [], activeDomain: '' };
+}
+function normalizeCloudflareDomainValue(value) { return String(value || '').trim(); }
+function getCloudflareTempEmailDomainsFromState() {
+  return { domains: [], activeDomain: '' };
+}
+function normalizeCloudflareTempEmailDomainValue(value) { return String(value || '').trim(); }
+function getSelectedLocalCpaStep9Mode() { return 'submit'; }
+function getSelectedMail2925Mode() { return 'provide'; }
+function getSelectedHotmailServiceMode() { return 'local'; }
+function buildManagedAliasBaseEmailPayload() {
+  return { gmailBaseEmail: '', mail2925BaseEmail: 'demo@2925.com', emailPrefix: '' };
+}
+function normalizeLuckmailBaseUrl(value) { return String(value || '').trim(); }
+function normalizeLuckmailEmailType(value) { return String(value || '').trim() || 'ms_graph'; }
+function normalizeCloudflareTempEmailBaseUrlValue(value) { return String(value || '').trim(); }
+function normalizeCloudflareTempEmailReceiveMailboxValue(value) { return String(value || '').trim(); }
+function normalizeAccountRunHistoryHelperBaseUrlValue(value) { return String(value || '').trim(); }
+${bundle}
+return { collectSettingsPayload };
+`)();
+
+  const payload = api.collectSettingsPayload();
+
+  assert.equal(payload.currentMail2925AccountId, 'acc-2');
+  assert.equal(payload.mail2925UseAccountPool, true);
+});
diff --git a/项目完整链路说明.md b/项目完整链路说明.md
index 3fa355c..6183c2d 100644
--- a/项目完整链路说明.md
+++ b/项目完整链路说明.md
@@ -141,7 +141,7 @@
 - 标签注册表
 - 最近打开的来源地址
 - LuckMail 当前运行时选择
-- 2925 当前运行时账号选择 `currentMail2925AccountId`
+- 2925 当前选中的账号 ID `currentMail2925AccountId`（运行时会同步到持久配置，用于重开浏览器后恢复同一个号池账号）
 
 补充：
 
@@ -156,6 +156,7 @@
 - Hotmail 账号池
 - 2925 账号池
 - 2925 是否启用号池模式 `mail2925UseAccountPool`
+- 2925 当前选中的号池账号 ID `currentMail2925AccountId`
 - Cloudflare / Temp Email 设置
 - iCloud 相关偏好
 - LuckMail API 配置