But that’s not all there is to it. According to Microsoft, leaving JIT enabled makes it impossible to implement other features that can help security. For example, Intel’s Controlflow-Enforcement Technology (CET), a hardware-based exploit mitigation, has to be disabled. With Super Duper Secure Mode in Edge, Microsoft is not only disabling the JIT compiler, but also enabling CEF for extra security. Microsoft also plans to enable Arbitrary Code Guard (ACG) in the future – another thing that wasn’t feasible with the JIT compiler enabled.
Microsoft is pretty clear that this is just a test, so don’t expect this to become a feature anytime soon. However, if you find the idea interesting, you can give it a shot. You can enable SDSM in Edge Beta, Dev, or Canary by going to edge://flags. The respective flag is simply called Super Duper Secure Mode.