I think it would better to inform user that they need to enable WebRTC in about:config, i.e. first time installment, and add an inform when WebRTC is disabled.
Last but not least, we should also inform user that this extension should only used for censor-free internet region users. This add-on is not a proxy or VPN.

helps people circumvent censorship without even making a dent in browser performance

This is a crazy good idea as firefox is ubiquitous and always on.
I wonder if there's a snowflake service for linux though.

Während des surfens hilft man nebenbei anderen Menschen. Toll!

thanks a lot