The problem is that they're all either forks of the same codebases or toys, and none are built around an adversarial model of the content they're interacting with. That's not something you can tack on. Has to be built-in from day zero.
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So have I. I know how to see problems that can't be solved in existing implementations and this is the deepest one I've ever seen.
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All the existing good work has come from Tor Browser, but it's built on a foundation with no capability to cut off fingerprinting entirely. To do that you need 100% determinism.
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No, deterministic runtime behavior for code hosted by the browser (js).
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Reproducible builds are turned on by default for -RELEASE: svnweb.freebsd.org/base/releng/12
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Used to be turned on in -CURRENT when it was being tested, but it has been turned off now that there's another branch where it's used, whereas -CURRENT has more need to have the revision printed in uname (which is one of the things that make a build irreproducible).