Gossip does not manage a Tor connection, nor does it talk through a Tor SOCKS proxy (e.g. on port 9050 which is typical). Sorry. Partly I'm not supporting that because I think that is a dangerous way for anybody to be using Tor.  But also because I just didn't bother to code it.

The reason torbrowser exists, rather than pointing your normal browser at a Tor SOCKS proxy, is because those developers found all kinds of ways that the web stack can accidently go around Tor and leak.  Even though gossip doesn't use the web stack, I'd feel safer knowing I didn't break somebody's opsec accidently with some bug.  Gossip and all nostr software is highly buggy still as it is all still so new.

I strongly recommend that if you want privacy, you use whonix or qubes.  If you are on an operating system that uses Tor for everything such as Whonix or Qubes, then yes gossip will work with .onion addresses just like with any other DNS address. 

 I appreciate the detailed response. ill keep playing around with gossip just prolly not on this npub 🤙