I thought there was a way to import your existing nostr keys into the nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm extension but I don’t remember exactly how to do that. Tagged them in case they have a moment to respond.
Discussion
Sure thing, nostr:npub1z5ad2zt6ujnrg8gllkv587ke9slg26dgcslxt6qtyqw6s28jytmqymplkv, any time you connect new wallet/node to the extension, new profile is being created (in the extension) with new - random - Nostr keys.
You need to go to "wallet settings"

Then in "Key Management" -> "Nostr Keys" you can import (paste) your previous, existing nsec, so you could use your profile.
Alby Extension will to to sign the events of the wallet that is currently active there.