why seamonkey uses port 445?

[lvm]

Some time ago my samba logs started filling with

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[2018/04/15 09:42:44.773530,  0] ../source3/smbd/process.c:339(read_packet_remainder)
  read_fd_with_timeout failed for client 127.0.0.1 read error = NT_STATUS_END_OF_FILE.

Turns out, it is seamonkey 2.49.2

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smbd       4261     root   35u  IPv4 2612048      0t0  TCP localhost:445->localhost:44414 (ESTABLISHED)
seamonkey 32169      lvm   80u  IPv4 2616552      0t0  TCP localhost:44414->localhost:445 (ESTABLISHED)

Why and what is going on?

[frg]

Not here under Windows. Try about:networking . Not styled so probably only works with the classic theme.

[Anonymosity]

I looked up info on port 445.
Microsoft SMB Domain Server

Microsoft SMB Protocol and CIFS Protocol Overview

The Server Message Block (SMB) Protocol is a network file sharing protocol, and as implemented in Microsoft Windows is known as Microsoft SMB Protocol. The set of message packets that defines a particular version of the protocol is called a dialect. The Common Internet File System (CIFS) Protocol is a dialect of SMB. Both SMB and CIFS are also available on VMS, several versions of Unix, and other operating systems.

[Grumpus]

With most Linux OSs there's no need to allow 445. Blocking this port stops a whole lot of DoS attempts, tracking and other access attempts.
Here's what is in your /etc/services file:
#microsoft-ds 445/tcp # Microsoft Naked CIFS
#microsoft-ds 445/udp