MDN does detect the browser language. Howerver, the URLs are contextual to language.
Meaning _https://marketplace.firefox.com/developers/docs/patterns_
should be redirected depending the language:
- **fr**: https://developer.mozilla.org/fr/docs/Web/Apps/Design/Patrons_navigation_adaptative
- **en**: https://developer.mozilla.org/en-US/Apps/Design/Responsive_Navigation_Patterns

Do we have any way to find the matching URL?