Website can detect many things about the Web browser configuration. It can indeed know that an ad blocker is used. It can know as well that Tor is used (its exit nodes are not secret). The more tweaking, the higher the risk that the fingerprint of the browser is (close to) unique and that websites can track you. That is why the Tor Browser is configured in a very generic way. It even sends wrong information to the websites because that information is more common. The developers recommend not to install add-ons or plugins because that makes the fingerprint more unique.

All that said, another possibility is to randomize the information, in particular the user agent information that gives what browser in what version is used. The add-on named "Random Agent Spoofer" does that. But the developer of the Tor browser argue that uniformity is safer than randomization: https://www.torproject.org/projects/torbrowser/design/#fingerprinting-linkability

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