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.