To the best of my understanding, nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm is quite safe. You’re storing the keys locally in your browser extension, not on their server. While this is still not as safe as using the secure element on your phone, I don’t believe anyone I know has had any issues. nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm is also open source with lots of eyeballs on it, which is good for security. What’s more, they now offer child key permissions to restrict what can be signed I believe. Perhaps nostr:npub1xv8mzscll8vvy5rsdw7dcqtd2j268a6yupr6gzqh86f2ulhy9kkqmclk3x can share more details