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Mozilla revealed in mid-2018 that it had plans to improve the handling of different interface languages in the Firefox web browser.

Firefox supported two options back then to change the language of the browser's interface: download and install language packs, or re-install Firefox using the installer of the desired language.

Both options were inferior to how Google Chrome handled language changes. Chrome users can change the interface language directly in the browser without the need to install a language pack or re-install the entire browser.

The release of Firefox 65 improves how Firefox users may change the browser's interface language. Mozilla integrated language switching options directly to the Firefox settings.

Firefox and interface languages

Firefox users may still download a different language version of the web browser and install it over the current installation to change the language, but they don't have to if they run Firefox Beta or Stable.

Firefox Nightly is excluded because strings change frequently in the browser.

* Load about:preferences in the browser's address bar.

* Scroll down to the Language and Appearance section.

* The current interface language is displayed under language. Click on "Set Alternatives" to add additional languages to Firefox.

* Select "Select a language to add" and then "Search for more languages".

* Firefox retrieves the list of supported languages from Mozilla. Click on "select a language to add" and pick one of the available interface languages to add it as a language in Firefox.

Tip: tap on the first letter of the language's name to jump to the letter in the listing.

* Select Add to add the language. Firefox downloads the language pack from Mozilla and adds it to the browser. If a dictionary is available, it is also downloaded.

* Repeat the process for other languages that you may want to add.

* The order of languages determines the priority in which they will be used. You may use the move up or down buttons to change the order.

* Click on the ok button once you are done.

* Firefox displays a restart notification afterward if you changed the main display language. The restart notification is displayed in the old and new interface language. Select "apply and restart" to restart Firefox so that the new interface language is used.