I find temporary keys more confusing. I think in case the extension couldn’t be found (or getPublicKey() fails), it should tell the user: “Please approve the encryption key on your bunker app: npub1…”.

Also, unrelated, it would be nice if nsec.app could temporarily pause permissions to an app without deleting it completely, and if the oauth-like popup specified in bold text: “Please enter the passphrase only if you trust this device to keep a copy of your main key!”.