Ok so it finally works. You can have sites bypassing the VPN and that's a great feature. It may be the only vpn able to do so inside the same software! Be careful though, do not exclude firefox from MozVPN. It says you can disable the protection for the rest of the computer but it seems to be a little unstable if you do so, I would recommend not to

I don't get why this is limited to Windows if it runs in browser.

Awesome! Finally some control over the VPN right in Firefox, love it!

Would otherwise be 5* if not for -
1. The settings for which sites bypass VPN don't sync between devices.
2. Not being able to input sites to the bypass list via any other means than going to the site first and clicking the extension.
Either a list you could copy links into or a list generated via your cookies/browsing history would be useful.
These are mostly ease of use features however, the rest of the extension/VPN have been excellent and without issues on my end.