I am still learning.  What I *think* is the case:

- yes all browsers can access the DNS records with a fetch
- i am still learning about how #pubky are going to do DNS servers
- Tor gives you a .onion address which you can share
- It can be access with the tor browser or command line
- I dont know about regular browsers accessing .onion sites, it probably needs some tool like a proxy
- I dont think chrome or firefox let you use .onion natively, Brave works
- on Brave browser hit alt+shift+N for new window, and type in the onion address, it works.