Does Brave have their own extension repository yet, or are they still leaving that all up to Google? I don't see much value in Brave supporting a feature dropped from Chrome if it only has Chrome extensions and they all drop support for it anyway.
Specifically, "we have decided to implement DNR and continue maintaining support for blocking webRequest. Our initial goal for implementing DNR is to provide compatibility with Chrome so developers do not have to support multiple code bases if they do not want to. With both APIs supported in Firefox, developers can choose the approach that works best for them and their users."
https://blog.mozilla.org/addons/2021/05/27/manifest-v3-updat...