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Web dev: What browser is visiting the page?
User agent string:
A screenshot of a browser. The URL bar reads firefox://settings, a button on the URL bar is labelled Netscape, a popup from the button reads: "You're viewing a secure Opera page", and the web page title reads "Chrome settings".
That's exactly what you're supposed to do with the modern web, via feature detection and client hints.
The user agent in Chrome (and I think Firefox too) is "frozen" now, meaning it no longer receives any major updates.