Use the Firefox interface in other languages with language packs

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.
You can always get Firefox directly in your language by downloading it from

If you want to control the preferred languages for websites that offer their content in multiple languages, see the Languages section of this article.

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.
Note: If you are unable to install any language pack, see the article Unable to install add-ons (extensions or themes). If you are using a pre-release build of Firefox, you need to browse the Mozilla file servers to find compatible language packs, even though these are only recommended for testing purposes.

How to manage language packs

To see what language packs you have installed:

  1. Click the menu button Fx57menu New Fx Menu and choose Add-ons Fx57Addons-icon Add-ons. The Add-ons Manager tab will open.

  2. In the Add-ons Manager tab, select the Languages panel.

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. In the address bar, type about:config and press EnterReturn.

    • The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!I accept the risk! to continue to the about:config page.
  2. In the Search field, type intl.locale.matchOS.
  3. If the intl.locale.matchOS preference has a value of true, double-click it to toggle its value to false.
  4. Clear the Search field, and type general.useragent.locale.
  5. Double-click the general.useragent.locale preference, and enter the code of the language you want to use. This page lists most of the language codes used for Mozilla localizations.
  6. Click the menu button New Fx Menu and then click ExitQuit Close 29 .

    Click the Firefox menu Fx57Menu , then click Exit. Click the Firefox menu at the top of the screen, then click Quit Firefox.Click the Firefox menu Fx57Menu , then click Quit.

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

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