I don't think there is a way to pass a param to the webstore that is then passed on to the extension during the first run.

One workaround I've seen other extensions do is to set a cookie, then do a request to a server from the extension. I don't think that's a good solution for this use case as it requires a webserver and hardcoded URL in the extension.

Would it be feasible to offer a NIP-07 way to add a key to extension signers? We have some similar method available to add lightning credentials: (e.g. `nostr.addSecretKey`)

https://guides.getalby.com/developer-guide/alby-browser-extension-apis/window.alby/adding-accounts