![What language are mozilla firefox extensions written in](https://knopkazmeya.com/19.jpg)
![what language are mozilla firefox extensions written in what language are mozilla firefox extensions written in](https://www.patriotsystems.com/P68Library/images/firefox_language_settings.png)
The preference determines the priority of languages in Firefox.
![what language are mozilla firefox extensions written in what language are mozilla firefox extensions written in](https://www.digitalcitizen.life/wp-content/uploads/2020/10/firefox_language_4.png)
Select "apply and restart" to restart Firefox so that the new interface language is used. The restart notification is displayed in the old and new interface language.
![What language are mozilla firefox extensions written in](https://knopkazmeya.com/19.jpg)
The preference determines the priority of languages in Firefox.
Select "apply and restart" to restart Firefox so that the new interface language is used. The restart notification is displayed in the old and new interface language.