diff --git a/src/common/constants.js b/src/common/constants.js
index 3279074..4024b37 100644
--- a/src/common/constants.js
+++ b/src/common/constants.js
@@ -1,3 +1,5 @@
+export const ILLEGAL_URLS = ['about:', 'chrome:', 'file:', 'wss:']
+
 export const PICKED_TAB_PROPS = ['url', 'title', 'favIconUrl', 'pinned']
 export const PICKED_LIST_RPOPS = ['_id', 'tabs', 'title', 'time', 'pinned', 'expand', 'color']
 export const SYNCED_LIST_PROPS = ['_id', 'tabs', 'title', 'time', 'pinned', 'color']
diff --git a/src/common/list.js b/src/common/list.js
index 35cee40..947ac3f 100644
--- a/src/common/list.js
+++ b/src/common/list.js
@@ -1,13 +1,11 @@
 import _ from 'lodash'
-import {
-  PICKED_TAB_PROPS,
-  PICKED_LIST_RPOPS,
-} from './constants'
 import {genObjectId} from './utils'
+import {normalizeTab} from './tab'
+import {PICKED_LIST_RPOPS} from './constants'
 
 export const createNewTabList = ({tabs, title, time}) => ({
   _id: genObjectId(),
-  tabs: tabs || [],
+  tabs: Array.isArray(tabs) ? tabs.map(normalizeTab) : [],
   title: title || '',
   time: time || Date.now(),
   titleEditing: false,
@@ -17,10 +15,10 @@ export const createNewTabList = ({tabs, title, time}) => ({
 })
 
 // Preserving the needed properties before store lists.
-export const normalize = list => {
+export const normalizeList = list => {
   const normalizedList = _.pick(list, PICKED_LIST_RPOPS)
-  normalizedList.tabs = normalizedList.tabs.map(tab => _.pick(tab, PICKED_TAB_PROPS))
+  normalizedList.tabs = normalizedList.tabs.map(normalizeTab)
   return normalizedList
 }
 
-export default {createNewTabList, normalize}
+export default {createNewTabList, normalizeList}
diff --git a/src/common/listManager.js b/src/common/listManager.js
index 9147c60..8331f03 100644
--- a/src/common/listManager.js
+++ b/src/common/listManager.js
@@ -5,6 +5,7 @@ import {
   END_FRONT,
   END_BACKGROUND,
 } from './constants'
+import {isBackground} from './utils'
 
 const cache = { lists: null, ops: null }
 const getStorage = async () => {
@@ -87,32 +88,33 @@ manager.modifiers = {
     return true
   },
 }
+const applyChangesToStorage = async (method, args) => {
+  const {lists, ops} = await getStorage()
+  if (manager.modifiers[method](lists, args)) ops.push({method: name, args, time: Date.now()})
+  saveStorage()
+}
 const addEventListener = (receiveFrom, callback) => browser.runtime.onMessage.addListener(({listModifed, from}) => {
-  if (receiveFrom !== from) return
-  if (!listModifed) return
+  if (receiveFrom !== from || !listModifed) return
   const {method, args} = listModifed
   return callback(method, args)
 })
 const genMethods = isBackground => {
-  for (const [name, func] of Object.entries(manager.modifiers)) {
-    manager[name] = isBackground ? async (...args) => { // for background
-      console.debug('[list manager] modify list:', name, ...args)
-      const {lists, ops} = await getStorage()
-      if (func(lists, args)) ops.push({method: name, args, time: Date.now()})
-      saveStorage()
-      await browser.runtime.sendMessage({listModifed: {method: name, args}, from: END_BACKGROUND})
+  Object.keys(manager.modifiers).forEach(method => {
+    manager[method] = isBackground ? async (...args) => { // for background
+      console.debug('[list manager] modify list:', method, ...args)
+      await applyChangesToStorage(method, args)
+      await browser.runtime.sendMessage({listModifed: {method, args}, from: END_BACKGROUND})
     } : async (...args) => { // for front end
       console.debug('[list manager] call to modify list:', name, ...args)
-      await browser.runtime.sendMessage({listModifed: {method: name, args}, from: END_FRONT})
+      await browser.runtime.sendMessage({listModifed: {method, args}, from: END_FRONT})
     }
-  }
+  })
 }
 manager.init = async () => {
   if (manager.inited) return
-  const background = await browser.runtime.getBackgroundPage()
-  const isBackground = window === background
-  if (isBackground) await addEventListener(END_FRONT, (method, args) => manager[method](...args))
-  genMethods(isBackground)
+  const _isBackground = await isBackground()
+  if (_isBackground) await addEventListener(END_FRONT, applyChangesToStorage)
+  genMethods(_isBackground)
   manager.inited = true
 }
 const receiver = []
diff --git a/src/common/migrate.js b/src/common/migrate.js
index 62381e3..995a22e 100644
--- a/src/common/migrate.js
+++ b/src/common/migrate.js
@@ -1,5 +1,5 @@
 import _ from 'lodash'
-import {normalize} from './list'
+import {normalizeList} from './list'
 import options from './options'
 import {genObjectId} from './utils'
 import listManager from './listManager'
@@ -12,7 +12,7 @@ const migrate = async () => {
   if (version >= '1.4.0') return
   // every list need an ID
   const {lists} = await browser.storage.local.get('lists')
-  const {0: listsWithoutId, 1: listsWithId} = _.groupBy(lists.map(normalize), list => +!!list._id)
+  const {0: listsWithoutId, 1: listsWithId} = _.groupBy(lists.map(normalizeList), list => +!!list._id)
   await browser.storage.local.set({lists: listsWithId})
 
   for (const list of listsWithoutId.reverse()) {
diff --git a/src/common/service/boss.js b/src/common/service/boss.js
index 76fdc34..334712c 100644
--- a/src/common/service/boss.js
+++ b/src/common/service/boss.js
@@ -1,8 +1,8 @@
-import _ from 'lodash'
 import {
   TOKEN_KEY,
   AUTH_HEADER,
 } from '../constants'
+import {isBackground} from '../utils'
 import browser from 'webextension-polyfill'
 
    const apiUrl = 'http://127.0.0.1:3000'
@@ -172,8 +172,18 @@ const login = async token => {
   await refresh()
 }
 
+const initTimer = async () => {
+  if (window._timerInited || !await isBackground()) return
+  window._timerInited = true
+  window.setInterval(() => {
+    if (!navigator.onLine) return
+    refresh()
+  }, 60000)
+}
+
 export default {
   hasToken,
   refresh,
   login,
+  initTimer,
 }
diff --git a/src/common/storage.js b/src/common/storage.js
index 5e2c1d4..ef8498e 100644
--- a/src/common/storage.js
+++ b/src/common/storage.js
@@ -1,19 +1,17 @@
 import _ from 'lodash'
-import list from '@/common/list'
+import {normalizeList} from '@/common/list'
 import browser from 'webextension-polyfill'
 
 const get = key => browser.storage.local.get(key)
 
-const set = obj => {
-  return browser.storage.local.set(obj)
-}
+const set = obj => browser.storage.local.set(obj)
 
 const getLists = () => get('lists')
   .then(({lists}) => lists || [])
 
 const setLists = async lists => {
   if (!Array.isArray(lists)) throw new TypeError(lists)
-  const handledLists = lists.filter(i => Array.isArray(i.tabs)).map(list.normalize)
+  const handledLists = lists.filter(i => Array.isArray(i.tabs)).map(normalizeList)
   const {opts} = await get('opts')
   if (opts && opts.removeDuplicate) {
     handledLists.forEach(list => {
diff --git a/src/common/tab.js b/src/common/tab.js
new file mode 100644
index 0000000..8fc9163
--- /dev/null
+++ b/src/common/tab.js
@@ -0,0 +1,9 @@
+import _ from 'lodash'
+import {PICKED_TAB_PROPS} from './constants'
+
+// it also be applied for the browser Tab object
+export const normalizeTab = tab => {
+  const normalizedTab = _.pick(tab, PICKED_TAB_PROPS)
+  normalizedTab.muted = normalizedTab.muted || tab.mutedInfo && tab.mutedInfo.muted
+  return normalizedTab
+}
diff --git a/src/common/tabs.js b/src/common/tabs.js
index 09174f8..e78786c 100644
--- a/src/common/tabs.js
+++ b/src/common/tabs.js
@@ -3,13 +3,8 @@ import {createNewTabList} from './list'
 import _ from 'lodash'
 import browser from 'webextension-polyfill'
 import listManager from './listManager'
-import {PICKED_TAB_PROPS} from './constants'
+import {ILLEGAL_URLS} from './constants'
 listManager.init()
-const pickTabs = tabs => tabs.map(tab => {
-  const pickedTab = _.pick(tab, PICKED_TAB_PROPS)
-  pickedTab.muted = tab.mutedInfo && tab.mutedInfo.muted
-  return pickedTab
-})
 
 const getAllInWindow = windowId => browser.tabs.query({windowId})
 
@@ -60,9 +55,7 @@ const groupTabsInCurrentWindow = async () => {
   return result
 }
 
-const isLegalURL = url => [
-  'about:', 'chrome:', 'file:', 'wss:'
-].every(prefix => !url.startsWith(prefix))
+const isLegalURL = url => ILLEGAL_URLS.every(prefix => !url.startsWith(prefix))
 
 const storeTabs = async (tabs, listIndex) => {
   const appUrl = browser.runtime.getURL('')
@@ -74,7 +67,7 @@ const storeTabs = async (tabs, listIndex) => {
   browser.tabs.remove(tabs.map(i => i.id))
   const lists = await storage.getLists()
   if (listIndex == null) {
-    const newList = createNewTabList({tabs: pickTabs(tabs)})
+    const newList = createNewTabList({tabs})
     if (opts.pinNewList) newList.pinned = true
     lists.unshift(newList)
     await listManager.addList(newList)
diff --git a/src/common/utils.js b/src/common/utils.js
index 0cc0ca9..6585eff 100644
--- a/src/common/utils.js
+++ b/src/common/utils.js
@@ -39,3 +39,7 @@ export const genObjectId = () => {
   const timestamp = (new Date().getTime() / 1000 | 0).toString(16)
   return timestamp + 'xxxxxxxxxxxxxxxx'.replace(/[x]/g, () => (Math.random() * 16 | 0).toString(16)).toLowerCase()
 }
+export const isBackground = async () => {
+  if (window._isBackground != null) window._isBackground = window === await browser.runtime.getBackgroundPage()
+  return window._isBackground
+}
diff --git a/src/component/main/Toolbar.vue b/src/component/main/Toolbar.vue
index 356d25c..ef9c980 100644
--- a/src/component/main/Toolbar.vue
+++ b/src/component/main/Toolbar.vue
@@ -72,8 +72,8 @@ export default {
     ...mapMutations(['setConflict']),
     init() {
       this.onScroll()
-      document.addEventListener('online', () => this.online = true)
-      document.addEventListener('offline', () => this.online = false)
+      window.addEventListener('online', () => this.online = true)
+      window.addEventListener('offline', () => this.online = false)
       chrome.runtime.onMessage.addListener(msg => {
         console.log(msg)
         if (msg.refresh) {
diff --git a/src/page/main/DetailList.vue b/src/page/main/DetailList.vue
index 0503981..5cfda95 100644
--- a/src/page/main/DetailList.vue
+++ b/src/page/main/DetailList.vue
@@ -251,7 +251,8 @@ import draggable from 'vuedraggable'
 
 import __ from '@/common/i18n'
 import tabs from '@/common/tabs'
-import list from '@/common/list'
+import {normalizeTab} from '@/common/tab'
+import {createNewTabList} from '@/common/list'
 import storage from '@/common/storage'
 import listManager from '@/common/listManager'
 import {formatTime} from '@/common/utils'
@@ -332,13 +333,13 @@ export default {
       this.expandList(newStatus[index], index)
     },
     tabMoved(changedLists) {
+      // judge last list firstly in order to avoid list index changed
       _.uniq(changedLists).sort((a, b) => b - a).forEach(listIndex => {
         const list = this.lists[listIndex]
+        console.log('tab moved', list)
         if (list.tabs.length === 0) this.removeList(listIndex)
         else listManager.updateListById(list._id, _.pick(list, 'tabs'))
       })
-      // this.storeLists()
-
     },
     async getLists() {
       const lists = await storage.getLists()
@@ -364,11 +365,6 @@ export default {
     updateExpandStatus() {
       this.$refs.panel.updateFromValue(this.expandStatus)
     },
-    storeLists: _.debounce(async function storeLists() {
-      console.time('store')
-      await storage.setLists(this.lists) // eslint-disable-line
-      console.timeEnd('store')
-    }, 2000),
     removeList(listIndex) {
       const list = this.lists[listIndex]
       if ((list.tabs.length !== 0) && this.opts.alertRemoveList && !confirm(`${__('ui_remove_list')}:
@@ -376,14 +372,12 @@ export default {
         ${__('ui_created')} ${formatTime(list.time)}`)) return
       this.lists.splice(listIndex, 1)
       listManager.removeListById(list._id)
-      // this.storeLists()
     },
     removeTab(listIndex, tabIndex) {
       const list = this.lists[listIndex]
       list.tabs.splice(tabIndex, 1)
       if (this.lists[listIndex].tabs.length === 0) this.removeList(listIndex)
       listManager.updateListById(this.lists[listIndex]._id, _.pick(list, 'tabs'))
-      // this.storeLists()
     },
     openTab(listIndex, tabIndex) {
       tabs.openTab(this.lists[listIndex].tabs[tabIndex])
@@ -400,7 +394,6 @@ export default {
     saveTitle(listIndex) {
       const list = this.lists[listIndex]
       this.$set(list, 'titleEditing', false)
-      // this.storeLists()
       listManager.updateListById(list._id, _.pick(list, 'title'))
     },
     getDomain(url) {
@@ -413,12 +406,10 @@ export default {
     pinList(listIndex, pin = true) {
       const list = this.lists[listIndex]
       list.pinned = pin
-      // this.storeLists()
       listManager.updateListById(list._id, _.pick(list, 'pinned'))
     },
     swapListItem(a, b) {
       [this.lists[a], this.lists[b]] = [this.lists[b], this.lists[a]]
-      // this.storeLists()
       this.$forceUpdate()
       const list = this.lists[a]
       listManager.changeListOrderRelatively(list._id, b - a)
@@ -435,14 +426,12 @@ export default {
       const list = this.lists[listIndex]
       if (list.expand === expand) return
       list.expand = expand
-      // this.storeLists()
       listManager.updateListById(list._id, _.pick(list, 'expand'))
     },
     changeColor(listIndex, color) {
       const list = this.lists[listIndex]
       this.$set(list, 'color', color)
       list.color = color
-      // this.storeLists()
       listManager.updateListById(list._id, _.pick(list, 'color'))
     },
     rightClicked(listIndex, tabIndex, $event) {
@@ -479,23 +468,24 @@ export default {
         tabs.push(tab)
       })
       if (targetListIndex === -1) {
-        this.lists.unshift(list.createNewTabList({tabs}))
+        const newList = createNewTabList({tabs})
+        this.lists.unshift(newList)
+        listManager.addList(newList)
+        this.tabMoved(changedLists.map(i => i + 1)) // it will create a new list
       } else {
-        tabs.forEach(tab => this.lists[targetListIndex].tabs.push(tab))
+        tabs.forEach(tab => this.lists[targetListIndex].tabs.push(normalizeTab(tab)))
+        this.tabMoved(changedLists)
       }
-      this.tabMoved(changedLists)
     },
     duplicateSelectedItems() {
       const items = this.getSelectedItems()
-      console.log('item', items)
       if (!items) return
       const changedLists = []
       items.forEach(({listIndex, tabIndex}) => {
         changedLists.push(listIndex)
         const tab = Object.assign({}, this.lists[listIndex].tabs[tabIndex])
-        this.lists[listIndex].tabs.push(tab)
+        this.lists[listIndex].tabs.push(normalizeTab(tab))
       })
-      console.log('list', this.lists[changedLists[0]])
       this.tabMoved(changedLists)
     },
     async copyLinksOfSelectedItems() {
@@ -519,10 +509,12 @@ export default {
     removeSelectedItems() {
       const items = this.getSelectedItems()
       if (!items) return
+      const changedLists = []
       items.forEach(({listIndex, tabIndex}) => {
+        changedLists.push(listIndex)
         this.lists[listIndex].tabs.splice(tabIndex, 1)
       })
-      this.tabMoved()
+      this.tabMoved(changedLists)
     },
     showAll(listIndex) {
       this.lists[listIndex].showAll = true