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MAC address randomization?

Does randomizing MAC address further defend de-anonymizing? Suppose there’s a Firefox bug that allows JavaScript to read MAC address (and further, router MAC like in ip n), all your web browsing is then linked.
Maybe it’s not practical to do this on the hypervisor level, how about VM MAC spoofing? Is it a good idea to change Gateway and Workstation MAC address at times?

MAC address is mentioned here:

MAC randomization might make sense on the host. See:

As for MAC address inside VMs…

Using Multiple Whonix-Workstation ™ is generally recommended.

If such a bug allows to read the MAC address of the VM, what other things should be presumed readable from remote (such as Firefox when having a bug)? I am asking, because then the following would apply:

See also:

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