I at first posted this into the support section - but I don’t need support for this and as the wiki points for reports to the forum in general and I’m not sure about usual practice, I decided to repost it here, as it seems related.
The standard Thunderbird network configuration 127.0.0.1:9102 should be redirected by anon-ws-disable-stacked-tor to 10.152.152.10:9102, but it isn’t in 15.0.1.4.9.libvirt for me.
UWT_DEV_PASSTHROUGH=1 curl 127.0.0.1:9102 responds with curl: (7) Failed to connect to 127.0.0.1 port 9102: Connection refused
No file for the 9102 port in /lib/systemd/system/ gets created.
So Thunderbird doesn’t work with the pre-configured settings. Setting it to 10.152.152.10 obviously ‘fixes’ it. As the redirection got added in this thread, I thought it might be relevant.
If you deem my current other problems causing this (Flushing iptables once, else no connection), then please feel free to delete/ignore this post.