It actually was pretty easy. All I did was install Fennec and then tweak a few settings.
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I switched the browsing protection to strict
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I installed ublock origin
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I went to about:config and enabled resist fingerprinting
I ran some fingerprinting tests and my slightly modified Fennec performs about the same as Mull
Yeah that is not confidence inspiring. I don’t need it to be perfect but a web browser needs to focus on security instead of just winging it.