You are already free to do this in Qubes today, however I suggest that
doing so probably does not provide the properties you may expect.

You can do X-forwarding over SSH to another machine with your browser,
or whatever your preferred supposedly-secure remote-desktoping
application is.

However, beware that this has little benefit. Having a browser running
remotely does not magically remove your local machine from the
effective TCB [1] of browsing. If your local machine is compromised,
an attacker can use it to access your remote browser-machine just as
you would. In addition, the remote machine could be compromised
without compromising your local machine, and this would also
compromise whatever you were doing in your remote browser.

If you are trying to protect confidentiality of your browsing in the
event your local computer is stolen or whatever, then you *still*
require actually-working disk encryption. Securely providing keys to
remote machine is much more difficult than local machines.

The way I see it, running your browser remotely and connecting to it
actually /decreases/ security.

[1]: https://en.wikipedia.org/wiki/Trusted_computing_base

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