I do most of my HN browsing in the app [Materialistic], so I usually first look at articles using the built-in webview, then open externally in Firefox if that doesn't render correctly (which is unfortunately common. Not sure why, but I'm inclined to blame either the app or webview; for example, Wikipedia is served as a static site but renders as a blank page). In this case, they both rendered the same way (but was able to read the page with FF's reader mode).
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Oh I see it looks bad in Firefox on mobile. Fair enough.