Firefox lets you display menus, notifications, messages, and other parts of the Firefox interface in different languages.

Language packs are add-ons that let you to have more languages available for the user interface of Firefox. This article describes how to:

• Find, install and manage language packs in Firefox.
• Change the selected language for the interface of Firefox.

If you want to control the preferred languages for websites that offer their content in multiple languages, see the article Choose display languages for multilingual web pages.

Switch Firefox to another language

You can switch Firefox to display menus, notifications, and messages in a different language.

1. In the Menu bar at the top of the screen, click Firefox and select Settings (select Preferences on older macOS versions).Click the menu button and select Settings.
2. In the Language section of the General panel, choose a language from the drop-down list.
3. Restart Firefox.

Add languages to the Firefox interface

You can add languages for Firefox to uses to display features.

1. In the Menu bar at the top of the screen, click Firefox and select Settings (select Preferences on older macOS versions).Click the menu button and select Settings.
2. In the Language section of the General panel, click Search for more languages in the drop-down list.
3. Click Select more languages to add and choose the language you want to add, then click Add.
4. Use Move Up and Move Down to change the order or Remove to remove a language from the list.
5. Add more languages if you wish.
6. Click OK to save your changes.
7. Restart Firefox.

Set an order of preference for languages

If a Firefox feature is not available in your primary language, Firefox displays it in your next preferred language.

1. In the Menu bar at the top of the screen, click Firefox and select Settings (select Preferences on older macOS versions).Click the menu button and select Settings.
2. In the Language section, click Set Alternatives to open the Firefox Language Settings window.
3. Select a language and use Move Up and Move Down to change the order or Remove to remove a language from the list.

How to get language packs for Firefox

1. Visit the Mozilla Dictionaries & Language Packs page.
2. In the list, find the language you want to add, and click the Language Pack link for the language you wish to install. The main page of that language pack will open.
3. Click the Add to Firefox button to install it. Firefox will download the language pack and ask you to confirm the installation.

How to manage language packs

To see what language packs you have installed:

1. Click the menu button , click Add-ons and themesExtensions and themes and select Languages.

If you don't have a Languages panel, don't worry. It's hidden if you don't have language packs installed. The same goes for a few other uncommon types of add-ons.

How to uninstall language packs

If you want to remove a language pack, see Disable or remove Add-ons.

How to change the language of the user interface

Unlike themes, enabling a language pack in the Add-ons Manager only makes the language it provides available. To change the preferred language for the interface:

1. Type about:config in the address bar and press EnterReturn.
   A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.
2. Type intl.locale.requested in the Search field.
3. Double-click the intl.locale.requested preference, if found, or add it as a new preference (see Configuration Editor for Firefox for details).
4. Enter the code of the language you want to use as the string value or leave it blank to use the language of your system. This page lists most of the language codes used for Mozilla localizations.
5. Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.

When you start Firefox again, you will see the interface in the new specified language.