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So much easier to exploit the renderer followed by the kernel than dealing with this and you get far less from this. If there was a widely used browser implementation written in a memory safe language with no JIT, I'd expect to see more interesting exploitation work targeting it.
No reason for attackers to do anything innovative when there's little progress to eliminating / mitigating what they already know how to do well.
Maybe the trend of a Chromium JIT or memory corruption bug being found exploited in the wild at least once a month will shift things.
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