It’s the preferred solution.

If you need to switch between different interface languages,

  1. Install the language pack for the desired languages.
  2. Type about:config into the address bar and press Enter.
  3. To bypass the warning, press the big button labeled “I’ll be careful, I promise!”.
  4. In the search box, paste intl.locale.matchOS
  5. In the search results, if intl.locale.matchOS is set to true, double-click it to set its value to false.
  6. In the search box, paste general.useragent.locale
  7. In the search results, double-click general.useragent.locale and set its value to the desired language.
  8. Restart Firefox for the change to take effect.

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