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.

首先在 Android 或桌面端的 Firefox 中复现示例页面，然后检查 body overflow-x 和 .gatsby-highlight 代码示例的样式。完成的标准是文档页面在移动设备上仍保持可读，并且代码示例要么换行，要么提供自己的水平滚动。