Use Firefox in another language

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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 www.mozilla.org/firefox/all.

If you want to control the preferred languages for websites that offer their content in multiple languages, see Settings for web content, pop-ups, fonts, and languages.

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 Fx89menuButton, 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. 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 Firefox menu Fx89menuButton and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu Fx89menuButton and select Quit.

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