diff --git a/addon/prefs.js b/addon/prefs.js
index 9b118ed..be8f47d 100644
--- a/addon/prefs.js
+++ b/addon/prefs.js
@@ -1,2 +1,3 @@
-pref("extensions.zotero.__addonRef__.enable", true);
-pref("extensions.zotero.__addonRef__.input", "This is input");
+/* eslint-disable no-undef */
+pref("__prefsPrefix__.enable", true);
+pref("__prefsPrefix__.input", "This is input");
diff --git a/package.json b/package.json
index 1226fd6..b918871 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
     "addonID": "addontemplate@euclpts.com",
     "addonRef": "addontemplate",
     "addonInstance": "AddonTemplate",
+    "prefsPrefix": "extensions.zotero.addontemplate",
     "releasepage": "https://github.com/windingwind/zotero-addon-template/releases/latest/download/zotero-addon-template.xpi",
     "updaterdf": "https://raw.githubusercontent.com/windingwind/zotero-addon-template/bootstrap/update.json"
   },
@@ -39,26 +40,26 @@
   },
   "homepage": "https://github.com/windingwind/zotero-addon-template#readme",
   "dependencies": {
-    "zotero-plugin-toolkit": "^2.0.1"
+    "zotero-plugin-toolkit": "^2.1.3"
   },
   "devDependencies": {
-    "@types/node": "^18.11.17",
-    "@typescript-eslint/eslint-plugin": "^5.59.1",
-    "@typescript-eslint/parser": "^5.59.1",
-    "compressing": "^1.6.3",
+    "@types/node": "^18.16.5",
+    "@typescript-eslint/eslint-plugin": "^5.59.2",
+    "@typescript-eslint/parser": "^5.59.2",
+    "compressing": "^1.9.0",
     "concurrently": "^8.0.1",
     "cross-env": "^7.0.3",
-    "esbuild": "^0.17.4",
-    "eslint": "^8.39.0",
+    "esbuild": "^0.17.18",
+    "eslint": "^8.40.0",
     "eslint-config-prettier": "^8.8.0",
-    "minimist": "^1.2.7",
+    "minimist": "^1.2.8",
     "prettier": "2.8.8",
-    "release-it": "^15.6.0",
+    "release-it": "^15.10.3",
     "replace-in-file": "^6.3.5",
     "typescript": "^5.0.4",
-    "zotero-types": "^1.0.12"
+    "zotero-types": "^1.0.14"
   },
   "prettier": {
     "tabWidth": 2
   }
-}
\ No newline at end of file
+}
diff --git a/src/hooks.ts b/src/hooks.ts
index 8e47462..30d642f 100644
--- a/src/hooks.ts
+++ b/src/hooks.ts
@@ -6,7 +6,7 @@ import {
   UIExampleFactory,
 } from "./modules/examples";
 import { config } from "../package.json";
-import { getString, initLocale } from "./modules/locale";
+import { getString, initLocale } from "./utils/locale";
 import { registerPrefsScripts } from "./modules/preferenceScript";
 
 async function onStartup() {
diff --git a/src/modules/examples.ts b/src/modules/examples.ts
index 77dc765..c0e457b 100644
--- a/src/modules/examples.ts
+++ b/src/modules/examples.ts
@@ -1,5 +1,5 @@
 import { config } from "../../package.json";
-import { getString } from "./locale";
+import { getString } from "../utils/locale";
 
 function example(
   target: any,
diff --git a/src/modules/preferenceScript.ts b/src/modules/preferenceScript.ts
index 292ee77..709d45e 100644
--- a/src/modules/preferenceScript.ts
+++ b/src/modules/preferenceScript.ts
@@ -1,5 +1,5 @@
 import { config } from "../../package.json";
-import { getString } from "./locale";
+import { getString } from "../utils/locale";
 
 export function registerPrefsScripts(_window: Window) {
   // This function is called when the prefs window is opened
diff --git a/src/modules/locale.ts b/src/utils/locale.ts
similarity index 85%
rename from src/modules/locale.ts
rename to src/utils/locale.ts
index 09034d8..2b83153 100644
--- a/src/modules/locale.ts
+++ b/src/utils/locale.ts
@@ -1,5 +1,8 @@
 import { config } from "../../package.json";
 
+/**
+ * Initialize locale data
+ */
 export function initLocale() {
   addon.data.locale = {
     stringBundle: Components.classes["@mozilla.org/intl/stringbundle;1"]
@@ -8,6 +11,11 @@ export function initLocale() {
   };
 }
 
+/**
+ * Get locale string
+ * @param localString
+ * @param noReload
+ */
 export function getString(localString: string, noReload = false): string {
   try {
     return addon.data.locale?.stringBundle.GetStringFromName(localString);
diff --git a/src/utils/prefs.ts b/src/utils/prefs.ts
new file mode 100644
index 0000000..0d5b035
--- /dev/null
+++ b/src/utils/prefs.ts
@@ -0,0 +1,29 @@
+import { config } from "../../package.json";
+
+/**
+ * Get preference value.
+ * Wrapper of `Zotero.Prefs.get`.
+ * @param key
+ */
+export function getPref(key: string) {
+  return Zotero.Prefs.get(`${config.prefsPrefix}.${key}`, true);
+}
+
+/**
+ * Set preference value.
+ * Wrapper of `Zotero.Prefs.set`.
+ * @param key
+ * @param value
+ */
+export function setPref(key: string, value: string | number | boolean) {
+  return Zotero.Prefs.set(`${config.prefsPrefix}.${key}`, value, true);
+}
+
+/**
+ * Clear preference value.
+ * Wrapper of `Zotero.Prefs.clear`.
+ * @param key
+ */
+export function clearPref(key: string) {
+  return Zotero.Prefs.clear(`${config.prefsPrefix}.${key}`, true);
+}
diff --git a/src/utils/wait.ts b/src/utils/wait.ts
new file mode 100644
index 0000000..604237f
--- /dev/null
+++ b/src/utils/wait.ts
@@ -0,0 +1,49 @@
+/**
+ * Wait until the condition is `true` or timeout.
+ * The callback is triggered if condition returns `true`.
+ * @param condition
+ * @param callback
+ * @param interval
+ * @param timeout
+ */
+export function waitUntil(
+  condition: () => boolean,
+  callback: () => void,
+  interval = 100,
+  timeout = 10000
+) {
+  const start = Date.now();
+  const intervalId = ztoolkit.getGlobal("setInterval")(() => {
+    if (condition()) {
+      ztoolkit.getGlobal("clearInterval")(intervalId);
+      callback();
+    } else if (Date.now() - start > timeout) {
+      ztoolkit.getGlobal("clearInterval")(intervalId);
+    }
+  }, interval);
+}
+
+/**
+ * Wait async until the condition is `true` or timeout.
+ * @param condition
+ * @param interval
+ * @param timeout
+ */
+export function waitUtilAsync(
+  condition: () => boolean,
+  interval = 100,
+  timeout = 10000
+) {
+  return new Promise<void>((resolve, reject) => {
+    const start = Date.now();
+    const intervalId = ztoolkit.getGlobal("setInterval")(() => {
+      if (condition()) {
+        ztoolkit.getGlobal("clearInterval")(intervalId);
+        resolve();
+      } else if (Date.now() - start > timeout) {
+        ztoolkit.getGlobal("clearInterval")(intervalId);
+        reject();
+      }
+    }, interval);
+  });
+}
diff --git a/src/utils/window.ts b/src/utils/window.ts
new file mode 100644
index 0000000..4b072fa
--- /dev/null
+++ b/src/utils/window.ts
@@ -0,0 +1,66 @@
+import { getString } from "./locale";
+
+export { isWindowAlive, localeWindow };
+
+/**
+ * Check if the window is alive.
+ * Useful to prevent opening duplicate windows.
+ * @param win
+ */
+function isWindowAlive(win?: Window) {
+  return win && !Components.utils.isDeadWrapper(win) && !win.closed;
+}
+
+/**
+ * Locale the elements in window with the locale-target attribute.
+ * Useful when the window is created dynamically.
+ * @example
+ * In HTML:
+ * ```html
+ * <div locale-target="innerHTML,title" title="elem.title">elem.text</div>
+ * ```
+ * In `addon/chrome/locale/en-US/addon.properties`:
+ * ```properties
+ * elem.text=Hello World
+ * elem.title=Locale example
+ * ```
+ * In `addon/chrome/locale/zh-CN/addon.properties`:
+ * ```properties
+ * elem.text=你好世界
+ * elem.title=多语言样例
+ * ```
+ * After locale:
+ *
+ * if locale is "en-US"
+ * ```html
+ * <div locale-target="innerHTML,title" title="Locale example">Hello World</div>
+ * ```
+ * else if locale is "zh-CN"
+ * ```html
+ * <div locale-target="innerHTML,title" title="多语言样例">你好世界</div>
+ * ```
+ * @param win
+ */
+function localeWindow(win: Window) {
+  Array.from(win.document.querySelectorAll("*[locale-target]")).forEach(
+    (elem) => {
+      const errorInfo = "Locale Error";
+      const locales = elem.getAttribute("locale-target")?.split(",");
+      locales?.forEach((key) => {
+        const isProp = key in elem;
+        try {
+          const localeString = getString(
+            (isProp ? (elem as any)[key] : elem.getAttribute(key)).trim() || ""
+          );
+          isProp
+            ? ((elem as any)[key] = localeString)
+            : elem.setAttribute(key, localeString);
+        } catch (error) {
+          isProp
+            ? ((elem as any)[key] = errorInfo)
+            : elem.setAttribute(key, errorInfo);
+        }
+      });
+    }
+  );
+}