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> The rendering and JavaScript engines do not impact privacy.

Actually they absolutely do. You need to do mitigations against fingerprinting in order to protect privacy.

That has to do with what gets sent over the wire, not with rendering content or running arbitrary code

This is kind of puzzling. Fingerprinting (among other things) render to a canvas, and then send the resulting pixel data over the wire. So yes, fingerprinting requires sending stuff over the wire, but it also depends on running arbitrary code and rendering behavior.

Fingerprinting with canvas depends your GPU and font installed. Don't think there are any way out without hurting the rendering performance servery..

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