/usr/share/xfce4/helpers/mozilla-mailer.desktop is in libexo-helpers 0.10.2-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | [Desktop Entry]
Version=1.0
Icon=mozilla
Type=X-XFCE-Helper
Name=Mozilla Mail
Name[gl]=Mozilla Mail
Name[hu]=Mozilla levelező
Name[pt_BR]=Cliente de e-mail Mozilla
Name[uk]=Переглядач пошти Mozilla Mail
StartupNotify=false
X-XFCE-Binaries=mozilla;mozilla-gtk2;mozilla-gtk;
X-XFCE-Category=MailReader
X-XFCE-Commands=%B -mail;
X-XFCE-CommandsWithParameter=/usr/lib/x86_64-linux-gnu/xfce4/exo-1/exo-compose-mail-1 mozilla-remote %B "mailto:%s";/usr/lib/x86_64-linux-gnu/xfce4/exo-1/exo-compose-mail-1 mozilla %B "mailto:%s";
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