You can do this browser wide in the all site settings if you prefer to not be bothered just set it to block all new requests.

Qubes and opensuse are great for any VM needs. Not sure what the issue with privacy is exactly you can pretty much reconfigure any distro to be oriented the way you want it.

Novacustom looks pretty good. Wish it had amd GPU options but other than that the prices are right for the hardware.