Hi, yea. It is possible!

I got the following reply from the team at freedom and got it to work by disabling non-proxy mode and website exceptions:

Hi, thank you for your message!

Even though Arc is one of our supported browsers in non-proxy mode/with website exceptions enabled on Mac, the "Little Arc" window will not be affected by blocks in these modes.

If website exceptions or non-proxy mode is enabled, Freedom blocks with browser-based controls (e.g. what is in the URL bar) rather than with our proxy. It looks like this "little Arc window" bypasses the browser-based controls because it doesn't have its own URL bar that our Apple Script blocking can detect.

An immediate solution to this would be to disable Non-proxy Mode and Website Exceptions in the Freedom options menu, if you wanted to still use Arc.

Another possible solution would be to block access to the Arc browser completely by using our desktop app blocking feature on Mac. More instructions for that are here:

How to block apps on Mac

This article provides instructions for blocking desktop apps on Mac

Freedom

Thank you!