diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index f8623c4..e09bae3 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -8,6 +8,7 @@ module.exports = {
     "eslint:recommended",
     'plugin:@typescript-eslint/recommended',
     'plugin:react-hooks/recommended',
+    "prettier",
   ],
   ignorePatterns: ['dist', '.eslintrc.cjs'],
   globals: {
diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..6f00ef7
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,5 @@
+{
+  "trailingComma": "all",
+  "semi": true,
+  "printWidth": 120
+}
diff --git a/package.json b/package.json
index 8213ab0..3ea2c55 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "kor-address-extension",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "main": "dist/index.js",
   "type": "module",
   "repository": "git@github.com:Jaewoook/kor-address-extension.git",
@@ -23,17 +23,18 @@
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
     "@types/styled-components": "^5.1.34",
-    "@types/webextension-polyfill": "^0.10.7",
     "@typescript-eslint/eslint-plugin": "^7.13.0",
     "@typescript-eslint/parser": "^7.13.0",
     "@vitejs/plugin-react": "^4.3.1",
     "archiver": "^5.3.1",
     "chalk": "^4.1.0",
     "eslint": "^8",
+    "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-import": "^2.29.1",
     "eslint-plugin-react-hooks": "^4.6.2",
     "eslint-plugin-react-refresh": "^0.4.7",
     "fs-extra": "^10.1.0",
+    "prettier": "3.3.2",
     "typescript": "^5.4.5",
     "vite": "^5.3.1"
   },
@@ -46,7 +47,6 @@
     "react-dom": "^18.3.1",
     "react-icons": "^5.2.1",
     "recoil": "^0.7.7",
-    "styled-components": "^6.1.11",
-    "webextension-polyfill": "^0.12.0"
+    "styled-components": "^6.1.11"
   }
 }
diff --git a/src/shared/storage.ts b/src/shared/storage.ts
index 8d7fc64..b9e3302 100644
--- a/src/shared/storage.ts
+++ b/src/shared/storage.ts
@@ -1,13 +1,5 @@
-import type { Browser } from "webextension-polyfill";
 import type { AddressData, SearchKey } from "./models/address";
-import { isExtension } from "./utils";
-
-let browser: Browser | null = null;
-if (isExtension()) {
-  import("webextension-polyfill").then((module) => {
-    browser = module.default;
-  });
-}
+import { isExtension, getExtensionAPI } from "./utils";
 
 type SearchResultOptions = {
   showEng: boolean;
@@ -37,12 +29,14 @@ export const DEFAULT_SETTINGS: Settings = {
 };
 
 const get = (key?: string) => {
-  if (isExtension() && browser) {
-    return browser.storage.local.get(key);
+  const extAPI = getExtensionAPI();
+  if (isExtension() && extAPI) {
+    return extAPI.storage.local.get(key);
   }
 
   if (key) {
-    return { key: localStorage.getItem(key) };
+    const raw = localStorage.getItem(key);
+    return { [key]: raw ? JSON.parse(raw) : null };
   }
 
   return Array.from({ length: localStorage.length })
@@ -56,8 +50,9 @@ const get = (key?: string) => {
 };
 
 const set = (items: Record<string, any>) => {
-  if (isExtension() && browser) {
-    return browser.storage.local.set(items);
+  const extAPI = getExtensionAPI();
+  if (isExtension() && extAPI) {
+    return extAPI.storage.local.set(items);
   }
 
   return Object.entries(items).forEach(([key, value]) => {
@@ -77,6 +72,7 @@ export const getSearchResultOptions = async (): Promise<SearchResultOptions | nu
 
 export const getRecentAddressList = async (): Promise<AddressData[] | null> => {
   const recentAddressList = await get("addressData");
+  console.log("recent address list", recentAddressList);
   return recentAddressList?.addressData ?? null;
 };
 
@@ -88,7 +84,10 @@ export const setRecentAddressList = async (addressList: AddressData[]) => {
   set({ addressData: addressList });
 };
 
-export const validateSettingsData = (settingsData: unknown, expected: Record<string, any> = DEFAULT_SETTINGS): boolean => {
+export const validateSettingsData = (
+  settingsData: unknown,
+  expected: Record<string, any> = DEFAULT_SETTINGS,
+): boolean => {
   if (typeof settingsData !== "object" || settingsData === null) {
     return false;
   }
diff --git a/src/shared/utils.ts b/src/shared/utils.ts
index 7c33608..a00adae 100644
--- a/src/shared/utils.ts
+++ b/src/shared/utils.ts
@@ -39,3 +39,16 @@ export const getRuntime = (): Runtime => {
 };
 
 export const isExtension = () => getRuntime() === "extension";
+
+export const getExtensionAPI = () => {
+  if (!isExtension()) {
+    return null;
+  }
+  if (typeof chrome === "object") {
+    return chrome;
+  }
+  if (typeof browser === "object") {
+    return browser;
+  }
+  return null;
+};
diff --git a/yarn.lock b/yarn.lock
index 0e500d0..ea122fa 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -935,11 +935,6 @@
   resolved "https://registry.yarnpkg.com/@types/stylis/-/stylis-4.2.5.tgz#1daa6456f40959d06157698a653a9ab0a70281df"
   integrity sha512-1Xve+NMN7FWjY14vLoY5tL3BVEQ/n42YLwaqJIPYhotZ9uBHt87VceMwWQpzmdEt2TNXIorIFG+YeCUUW7RInw==
 
-"@types/webextension-polyfill@^0.10.7":
-  version "0.10.7"
-  resolved "https://registry.yarnpkg.com/@types/webextension-polyfill/-/webextension-polyfill-0.10.7.tgz#de059250599733a60ed26c8a0c81e21e11183b90"
-  integrity sha512-10ql7A0qzBmFB+F+qAke/nP1PIonS0TXZAOMVOxEUsm+lGSW6uwVcISFNa0I4Oyj0884TZVWGGMIWeXOVSNFHw==
-
 "@typescript-eslint/eslint-plugin@^7.13.0":
   version "7.13.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-7.13.0.tgz#3cdeb5d44d051b21a9567535dd90702b2a42c6ff"
@@ -1790,6 +1785,11 @@ escape-string-regexp@^4.0.0:
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz#14ba83a5d373e3d311e5afca29cf5bfad965bf34"
   integrity sha512-TtpcNJ3XAzx3Gq8sWRzJaVajRs0uVxA2YAkdb1jm2YkPz4G6egUFAyA3n5vtEIZefPk5Wa4UXbKuS5fKkJWdgA==
 
+eslint-config-prettier@^9.1.0:
+  version "9.1.0"
+  resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-9.1.0.tgz#31af3d94578645966c082fcb71a5846d3c94867f"
+  integrity sha512-NSWl5BFQWEPi1j4TjVNItzYV7dZXZ+wP6I6ZhrBGpChQhZRUaElihE9uRRkcbRnNb76UMKDF3r+WTmNcGPKsqw==
+
 eslint-import-resolver-node@^0.3.9:
   version "0.3.9"
   resolved "https://registry.yarnpkg.com/eslint-import-resolver-node/-/eslint-import-resolver-node-0.3.9.tgz#d4eaac52b8a2e7c3cd1903eb00f7e053356118ac"
@@ -2884,6 +2884,11 @@ prelude-ls@^1.2.1:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.2.1.tgz#debc6489d7a6e6b0e7611888cec880337d316396"
   integrity sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==
 
+prettier@3.3.2:
+  version "3.3.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.3.2.tgz#03ff86dc7c835f2d2559ee76876a3914cec4a90a"
+  integrity sha512-rAVeHYMcv8ATV5d508CFdn+8/pHPpXeIid1DdrPwXnaAdH7cqjVbpJaT5eq4yRAFU/lsbwYwSF/n5iNrdJHPQA==
+
 printj@~1.1.0:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/printj/-/printj-1.1.2.tgz#d90deb2975a8b9f600fb3a1c94e3f4c53c78a222"
@@ -3874,11 +3879,6 @@ vite@^5.3.1:
   optionalDependencies:
     fsevents "~2.3.3"
 
-webextension-polyfill@^0.12.0:
-  version "0.12.0"
-  resolved "https://registry.yarnpkg.com/webextension-polyfill/-/webextension-polyfill-0.12.0.tgz#f62c57d2cd42524e9fbdcee494c034cae34a3d69"
-  integrity sha512-97TBmpoWJEE+3nFBQ4VocyCdLKfw54rFaJ6EVQYLBCXqCIpLSZkwGgASpv4oPt9gdKCJ80RJlcmNzNn008Ag6Q==
-
 which-boxed-primitive@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz#13757bc89b209b049fe5d86430e21cf40a89a8e6"