I specifically emphasize on the home page of the project [1]:

"uBlock Origin (or uBlock₀) is not an ad blocker; it's a general-purpose blocker."

It will report everything to the user -- including behind-the-scene network requests [2].

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[1] https://github.com/gorhill/uBlock#philosophy

[2] https://github.com/gorhill/uBlock/wiki/Behind-the-scene-netw...