µBlock and µMatrix are parallel offshoots of gorhill's earlier HTTP Switchboard. They're refactored forms of HTTP Switchboard, where each extension focuses on different forms of blocking (µBlock for pattern-based filtering, µMatrix for matrix-based filtering).
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I was under the impression µBlock was a fork of uMatrix, made simpler for users.
µBlock and µMatrix are parallel offshoots of gorhill's earlier HTTP Switchboard. They're refactored forms of HTTP Switchboard, where each extension focuses on different forms of blocking (µBlock for pattern-based filtering, µMatrix for matrix-based filtering).
See:
https://github.com/gorhill/uMatrix/wiki/Changes-from-HTTP-Sw...
https://github.com/gorhill/uMatrix/wiki/Using-%C2%B5Block-wi...