Pages with code samples don't shrink properly in Firefox thus making the pages unreadable on mobile

I use Firefox on Android as my main browser and every time I follow a link from Twitter to the React docs, I inevitably can't read them without then copying the link in to Chrome because body has overflow-x: hidden and the .gatsby-highlight code samples don't wrap like they do in other browsers.

An example, broken page is https://reactjs.org/docs/add-react-to-a-website.html

This issue can also be reproduced in desktop Firefox:

Personally, I don't think that code samples should wrap and they should have their own horizontal scroll, but I'll leave it up to you which you think is the best course of action. Regardless, I'd be happy to try and fix it, whichever solution you decide on.

Empieza reproduciendo la página de ejemplo en Firefox para Android o de escritorio; después, inspecciona los estilos de body overflow-x y los ejemplos de código de .gatsby-highlight. Se considera terminado cuando la página de documentación siga siendo legible en dispositivos móviles y los ejemplos de código se ajusten a varias líneas o proporcionen su propio desplazamiento horizontal.