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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".
What's so insane about it? Web browsers are an evolution of the old gopher protocol. All this stuff has roots in text consoles.
The history makes plenty of sense, and explains why it's there in the fist place. The modern internet was not designed to use by console, though.