Yes, many options for Nostr signer extensions
) Amber by nostr:nprofile1qqs827g8dkd07zjvlhh60csytujgd3l9mz7x807xk3fewge7rwlukxgpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhszrnhwden5te0dehhxtnvdakz7auvdel is excellent for mobile (only available on Android as of now [iOS coming soon])
- https://github.com/greenart7c3/Amber
) Nsec.app by nostr:nprofile1qqsrx4k7vxeev3unrn5ty9qt9w4cxlsgzrqw752mh6fduqjgqs9chhgppemhxue69uhkummn9ekx7mp0qy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qg3waehxw309ahx7um5wgh8w6twv5hsxct838 is excellent, can be used on iOS via web (install on your homescreen and works great)
Desktop is easiest to use if using desktop often
You can find these in your browsers extensions store to add them. Just search your extensions store for "Nostr" and they should all pop up
- Alby
- Flamingo
- Nos2x
- Nostr Connect
Many more
Treat your nsec like you do your Bitcoin private keys
