Check out - Store keys safely without a browser extension! Nsec.app is a non-custodial web app that can be connected to Nostr apps and provide restricted access to your keys.
https://nostrapp.link/a/naddr1qqxnzdes8q6rzvf5xumrjwfjqgswyj5xjs7n02g6kjzad7d8cesf0sjam4n730gmwhkj223uyek0nwcrqsqqql8kwc5vaw