nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm extension is working on firefox android. If you link your nostr key with alby, you can use the extension to sign up in most nostr clients. Is that what you looking for ?

Nos2x is what i use with Kiwi browser on android

"Spring" sandbox for nostr apps