[Linux] Firefox HTTP/3/QUIC connections showed/reported as "Other Connections"

What happened: Since a few weeks, Portmaster intermittently shows connection prompts under Other Connections while browsing normally with Firefox.

For example if i browse YouTube, im getting promts for Other Connections to domains such as:

• *.googlevideo.com
• t1.gstatic.com
• t2.gstatic.com
• accounts.youtube.com

In the connection details, affected connections use UDP/443 and the Binary Path is empty. Firefox Secure DNS / DoH is disabled.

My Environment:

• Fedora Linux 44
• Kernel: 7.2.4-200.fc44.x86_64
• Portmaster: 2.2.3, stable channel
• Firefox: 155.0 64-bit, Fedora distribution package
• SPN: disabled
• VPN: none
• DNS: local Pi-hole

Portmaster's eBPF connection listener and bandwidth monitor appear to be running normally according to the Debug Info. (thanks ai!)

What did you expect to happen?: PortMaster should recognize Firefoxes connections.

How did you reproduce it?: My YouTube example, but its literally every webpage.

Workaround Disable Firefox HTTP/3: network.http.http3.enable = false Firefox then falls back to TCP/HTTP2 and the issue does not occur.