MDN Language Redirector

Much better than my implementation: https://github.com/wenfangdu/mdn-language-redirect, would've used it if I knew it exists 😄.

It does not work :( It redirected me to "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Referencje/Obiekty/Array/Reduce" instead of "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce" which gave me 404 page

This is exactly what I wanted. Thanks for guys on github suggesting this extension for the mozilla browser. Light and awesome to use!