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Qutebrowser
Qutebrowser is a keyboard-focused browser with a minimal GUI. It's based on Python and PyQt5 and free software, licensed under the GPL. Program tested: v1.6.1 for Debian Buster. Mitmproxy was used to check for connections.
Spyware Level: Not Spyware
Qutebrowser makes no unsolicited requests at all. It is also libre software. This web browser is a great choice to use, and there is nothing to complain about from a privacy standpoint. (although I don't really know how to use the User Interface that well...) So far this browser looks like it can stand tall in the ranks of the other privacy-respecting web browsers out there.