FYI, you can get FFUpdater in f-droid (or from it's git repo and keep it up to date using Obtainium) and it keeps a ton of privacy focused browsers available for you and keeps them up to date, including Kiwi. You could also use Obtainium to just get Kiwi from it's repo as well.

Also, nos2x (another nostr signing browser extension, works with rebelnet) works on iceraven, an FF fork also available through FFUpdater. 

 Thanks, great info!  Very helpful