diff --git a/src/entities/tab/index.ts b/src/entities/tab/index.ts
index ef30951..21e24c8 100644
--- a/src/entities/tab/index.ts
+++ b/src/entities/tab/index.ts
@@ -1,9 +1,9 @@
 import { atom, onMount, task } from 'nanostores'
 
-import { ITab, browser } from '@shared/browser'
+import { TTab, browser } from '@shared/browser'
 import { addToast, getErrorToast } from '@shared/ui/Toast'
 
-export const $activeTab = atom<ITab | null>(null)
+export const $activeTab = atom<TTab | null>(null)
 
 onMount($activeTab, () => {
   task(async () => {
diff --git a/src/shared/browser/__mocks__/chrome.ts b/src/shared/browser/__mocks__/chrome.ts
index 73fc220..f495286 100644
--- a/src/shared/browser/__mocks__/chrome.ts
+++ b/src/shared/browser/__mocks__/chrome.ts
@@ -1,9 +1,12 @@
 import { MockedObject, vi } from 'vitest'
 
+import { TOnChangeListenerProps } from '../types'
+
 type TChrome = typeof chrome
 type TStorageValue = Record<string, unknown>
 
 let store: TStorageValue = {}
+let listeners: Array<(changes: TOnChangeListenerProps) => void> = []
 
 function getStorageValueByKey(key: string) {
   const result: TStorageValue = {}
@@ -11,6 +14,10 @@ function getStorageValueByKey(key: string) {
   return result
 }
 
+export const chromeMockClearListeners = vi.fn(() => {
+  listeners = []
+})
+
 export const chromeMock = {
   storage: {
     local: {
@@ -20,14 +27,28 @@ export const chromeMock = {
       }),
 
       set: vi.fn((payload, cb) => {
-        Object.keys(payload).forEach((key) => (store[key] = payload[key]))
+        const changes: TOnChangeListenerProps = {}
+        Object.keys(payload).forEach((key) => {
+          if (payload[key]) {
+            store[key] = payload[key]
+            changes[key] = { oldValue: store[key], newValue: payload[key] }
+          }
+        })
+
+        for (const listener of listeners) {
+          listener(changes)
+        }
+
         return cb ? cb() : Promise.resolve()
       }),
 
       onChanged: {
-        addListener: vi.fn(),
+        addListener: vi.fn(
+          (listener: (changes: TOnChangeListenerProps) => void) => {
+            listeners.push(listener)
+          },
+        ),
         removeListener: vi.fn(),
-        hasListener: vi.fn(),
       },
 
       clear: vi.fn((cb) => {
diff --git a/src/shared/browser/__test__/chrome.test.ts b/src/shared/browser/__test__/chrome.test.ts
index 24ac3c5..c502ef5 100644
--- a/src/shared/browser/__test__/chrome.test.ts
+++ b/src/shared/browser/__test__/chrome.test.ts
@@ -114,7 +114,11 @@ describe('browser', () => {
             })
           })
 
-          chromeBrowser.storage.local.onChanged(KEY, callback, defaultValue)
+          chromeBrowser.storage.local.onChanged.addListener(
+            KEY,
+            callback,
+            defaultValue,
+          )
 
           expect(callback).toHaveBeenCalledWith(
             Result.Success({ newValue, oldValue }),
@@ -136,7 +140,11 @@ describe('browser', () => {
             })
           })
 
-          chromeBrowser.storage.local.onChanged(KEY, callback, defaultValue)
+          chromeBrowser.storage.local.onChanged.addListener(
+            KEY,
+            callback,
+            defaultValue,
+          )
 
           expect(callback).toHaveBeenCalledTimes(2)
 
@@ -170,7 +178,11 @@ describe('browser', () => {
             })
           })
 
-          chromeBrowser.storage.local.onChanged(KEY, callback, defaultValue)
+          chromeBrowser.storage.local.onChanged.addListener(
+            KEY,
+            callback,
+            defaultValue,
+          )
 
           const call = callback.mock.calls[0]
           expect(call[0].data).toBeNull()
diff --git a/src/shared/browser/chrome.ts b/src/shared/browser/chrome.ts
index 3ddacb7..7085186 100644
--- a/src/shared/browser/chrome.ts
+++ b/src/shared/browser/chrome.ts
@@ -1,7 +1,9 @@
+import { TLanguageCode } from '@entities/language'
+
 import { Result } from '@shared/libs/operationResult'
 
 import { PortReceiver } from './port'
-import { IBrowser } from './types'
+import { IBrowser, TOnChangeListenerProps } from './types'
 
 export const chromeBrowser: IBrowser = {
   storage: {
@@ -46,39 +48,46 @@ export const chromeBrowser: IBrowser = {
         })
       },
 
-      onChanged: (key, callback, defaultValue) => {
-        chrome.storage.local.onChanged.addListener((changes) => {
-          if (changes[key]) {
-            let oldValue = defaultValue
-            try {
-              oldValue = JSON.parse(changes[key].oldValue)
-            } catch (error) {
-              callback(
-                Result.Error({
-                  type: `ERROR_CAN_NOT_GET_OLD_DATA_FROM_STORAGE`,
-                  error: error instanceof Error ? error : null,
-                }),
-              )
-            }
+      onChanged: {
+        addListener: (key, callback, defaultValue) => {
+          const listener = (changes: TOnChangeListenerProps) => {
+            if (changes[key]) {
+              let oldValue = defaultValue
+              try {
+                oldValue = JSON.parse(changes[key].oldValue as string)
+              } catch (error) {
+                callback(
+                  Result.Error({
+                    type: `ERROR_CAN_NOT_GET_OLD_DATA_FROM_STORAGE`,
+                    error: error instanceof Error ? error : null,
+                  }),
+                )
+              }
 
-            try {
-              const newValue = JSON.parse(changes[key].newValue)
-              callback(
-                Result.Success({
-                  newValue: newValue,
-                  oldValue: oldValue,
-                }),
-              )
-            } catch (error) {
-              callback(
-                Result.Error({
-                  type: `ERROR_CAN_NOT_GET_NEW_DATA_FROM_STORAGE`,
-                  error: error instanceof Error ? error : null,
-                }),
-              )
+              try {
+                const newValue = JSON.parse(changes[key].newValue as string)
+                callback(
+                  Result.Success({
+                    newValue: newValue,
+                    oldValue: oldValue,
+                  }),
+                )
+              } catch (error) {
+                callback(
+                  Result.Error({
+                    type: `ERROR_CAN_NOT_GET_NEW_DATA_FROM_STORAGE`,
+                    error: error instanceof Error ? error : null,
+                  }),
+                )
+              }
             }
           }
-        })
+          chrome.storage.local.onChanged.addListener(listener)
+          return listener
+        },
+        removeListener: (listener) => {
+          chrome.storage.local.onChanged.removeListener(listener)
+        },
       },
     },
   },
@@ -87,6 +96,15 @@ export const chromeBrowser: IBrowser = {
     getMessage: (key, substitutions) => {
       return chrome.i18n.getMessage(key, substitutions)
     },
+
+    detectLanguage: async (text: string) => {
+      if (!text) return 'other'
+
+      const detectLanguageResult = await chrome.i18n.detectLanguage(text)
+
+      return (detectLanguageResult.languages[0].language ??
+        'other') as TLanguageCode
+    },
   },
 
   runtime: {
diff --git a/src/shared/browser/index.ts b/src/shared/browser/index.ts
index dd8dfd9..057b108 100644
--- a/src/shared/browser/index.ts
+++ b/src/shared/browser/index.ts
@@ -1,6 +1,7 @@
 import { chromeBrowser } from './chrome'
-import { IBrowser } from './types'
+import type { IBrowser } from './types'
 
 export const browser: IBrowser = chromeBrowser
-export type { ITab } from './types'
+
+export type { TTab, TOnChangeListenerProps } from './types'
 export * from './port'
diff --git a/src/shared/browser/types.ts b/src/shared/browser/types.ts
index be56c9a..e2dbee0 100644
--- a/src/shared/browser/types.ts
+++ b/src/shared/browser/types.ts
@@ -1,3 +1,5 @@
+import { TLanguageCode } from '@entities/language'
+
 import type { TResult } from '@shared/libs/operationResult'
 
 import { PortReceiver } from '.'
@@ -9,21 +11,32 @@ export interface IBrowser {
 
       set: <Data>(key: string, value: Data) => Promise<TResult<true>>
 
-      onChanged: <Data>(
-        key: string,
-        callback: (
-          changes: TResult<{
-            newValue: Data
-            oldValue: Data
-          }>,
-        ) => void,
-        defaultValue: Data,
-      ) => void
+      onChanged: {
+        addListener: <Data>(
+          key: string,
+          callback: (
+            changes: TResult<{
+              newValue: Data
+              oldValue: Data
+            }>,
+          ) => void,
+          defaultValue: Data,
+        ) => (changes: {
+          [key: string]: { newValue?: Data; oldValue?: Data }
+        }) => void
+        removeListener: <Data>(
+          callback: (changes: {
+            [key: string]: { newValue?: Data; oldValue?: Data }
+          }) => void,
+        ) => void
+      }
     }
   }
 
   i18n: {
     getMessage: (key: string, substitutions?: string | string[]) => string
+
+    detectLanguage: (text: string) => Promise<TLanguageCode>
   }
 
   runtime: {
@@ -33,9 +46,15 @@ export interface IBrowser {
   }
 
   tabs: {
-    getActiveTab: () => Promise<TResult<ITab>>
+    getActiveTab: () => Promise<TResult<TTab>>
   }
 }
 
-export type ITab = { id: number; url: string }
-export type IActiveTabInfo = { tabId: number }
+export type TTab = { id: number; url: string }
+export type TActiveTabInfo = { tabId: number }
+export type TOnChangeListenerProps<Value = unknown> = {
+  [key: string]: {
+    newValue?: Value
+    oldValue?: Value
+  }
+}