This is a manifest V2 extension. Unless someone converts it to V3, it will stop working end of this year.
Eg https://github.com/brave/brave-browser/issues/20059
> Yes - manifest v2 extensions will be supported by Brave We'll be taking steps as V2 is sunset by Chromium team (https://developer.chrome.com/docs/extensions/mv3/mv2-sunset/)
>During the deprecation period, we can keep this functionality via patch (since it's there for Enterprise). After V2 is pulled from store, we'll need to stand up our own extension store for manifest v2
I'm almost to the point of trying to do it myself.