gm-notify does not terminate child process: xdg-open

Description: Ubuntu 12.04 LTS
Release: 12.04

gm-notify:
  Installed: 0.10.3-0ubuntu2
  Candidate: 0.10.3-0ubuntu2
  Version table:
 *** 0.10.3-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
        100 /var/lib/dpkg/status

Be gentle -- this is my first bug report! If I can give more/better information, lemme know :)

Upon notification of a new email, I click the messaging icon, followed by the the Google Mail "Inbox [#]" pull-down menu item. This causes my browser (FF 12) to open and begin navigating to "https://mail.google.com/mail/#". At the same time, a new zombie process shows up in 'top' and 'System Monitor': xdg-open

27053 james 20 0 0 0 0 Z 0.0 0.0 0:00.00 xdg-open <defunct>

This zombie process will persist until restarting or manually killing it. Meanwhile, gm-notify continues to function. I'm guessing this is a minor bug, with no apparent detriments to performance or function, but I thought I should send in a report in case it is a sign of a more serious problem.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gm-notify 0.10.3-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Thu May 24 16:08:44 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gm-notify
UpgradeStatus: No upgrade log present (probably fresh install)