I’ve actually thought about it, but it sounds like too big of a project. I don’t think I’d have the time to maintain it for free. Besides, Lemmy being open source means we should probably focus on directly improving Lemmy vs doing it via addons (I made a tiny fix a few days ago, I can see myself contributing in a more soon).
Looks like it’s not working for you. The extension is supposed to work without setting a preferred server. The instance list is supposed to be pre populated. Something must have happened that prevented it from getting the list. Also, when you click save, it’s supposed to show a popup from the browser asking for extra permissions, and then in the Lemmy Go window there’s supposed to be a text at the bottom saying “validating instance…” and then “success!”, or some error. Is the rest of the extension working for you without setting the instance? It’s weird because the instance list comes from the same place as the community list used for the suggestions, so I’m wondering why one would fail but not the other.
I’m working on an update that will show better logs for errors like these.