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How do websites like https://www.whatismybrowser.com/ know what my browser "looks like" even when changing my user agent |
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This is a ... very complicated question. There are a few more ways designed to identify a browser that this addon isn't spoofing. One of them is the Client Hints headers, which would identify Chrome even with a UA spoof - and if Firefox sends a Chrome UA but no Client Hints, then it can't possibly be a real Chrome. There's also a lot more advanced browser fingerprinting. You can, for example, check if the browser supports WebUSB. If it does not (like Firefox), but it sends a Chrome user agent, it clearly can't be Chrome. This is a very deep rabbit hole. :) |
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This is a ... very complicated question.
There are a few more ways designed to identify a browser that this addon isn't spoofing. One of them is the Client Hints headers, which would identify Chrome even with a UA spoof - and if Firefox sends a Chrome UA but no Client Hints, then it can't possibly be a real Chrome.
There's also a lot more advanced browser fingerprinting. You can, for example, check if the browser supports WebUSB. If it does not (like Firefox), but it sends a Chrome user agent, it clearly can't be Chrome. This is a very deep rabbit hole. :)