hp device manager can't find firefox

kubuntu 14.04 x86-64 upgraded from hplip 3.14.3 to 3.15.11 as needed for m477fdn (on order.)

the tray hp device manager claims it can not find firefox. not a critical problem, but i would like to know how to fix it.

Saving output in log file: /home/ewhite/work/hp-check.log

HP Linux Imaging and Printing System (ver. 3.15.11)
Dependency/Version Check Utility ver. 15.1

Copyright (c) 2001-15 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Note: hp-check can be run in three modes:
1. Compile-time check mode (-c or --compile): Use this mode before compiling the
HPLIP supplied tarball (.tar.gz or .run) to determine if the proper dependencies are
installed to successfully compile HPLIP.
2. Run-time check mode (-r or --run): Use this mode to determine if a distro
supplied package (.deb, .rpm, etc) or an already built HPLIP supplied tarball has
the proper dependencies installed to successfully run.
3. Both compile- and run-time check mode (-b or --both) (Default): This mode will
check both of the above cases (both compile- and run-time dependencies).

Check types:
a. EXTERNALDEP - External Dependencies
b. GENERALDEP - General Dependencies (required both at compile and run time)
c. COMPILEDEP - Compile time Dependencies
d. [All are run-time checks]
PYEXT SCANCONF QUEUES PERMISSION

Status Types:
    OK
    MISSING - Missing Dependency or Permission or Plug-in
    INCOMPAT - Incompatible dependency-version or Plugin-version

---------------
| SYSTEM INFO |
---------------

 Kernel: 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 GNU/Linux
 Host: hp2530p2
 Proc: 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 GNU/Linux
 Distribution: ubuntu 14.04
 Bitness: 64 bit

-----------------------
| HPLIP CONFIGURATION |
-----------------------

HPLIP-Version: HPLIP 3.15.11
HPLIP-Home: /usr/share/hplip
HPLIP-Installation: Auto installation is supported for ubuntu distro 14.04 version

Current contents of '/etc/hp/hplip.conf' file:
# hplip.conf. Generated from hplip.conf.in by configure.

[hplip]
version=3.15.11

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/HP
ppdbase=/usr/share/ppd
doc=/usr/share/doc/hplip-3.15.11
html=/usr/share/doc/hplip-3.15.11
icon=/usr/share/applications
cupsbackend=/usr/lib/cups/backend
cupsfilter=/usr/lib/cups/filter
drv=/usr/share/cups/drv/hp
bin=/usr/bin
apparmor=/etc/apparmor.d
# Following values are determined at configure time and cannot be changed.
[configure]
network-build=yes
libusb01-build=no
pp-build=no
gui-build=yes
scanner-build=yes
fax-build=yes
dbus-build=yes
cups11-build=no
doc-build=yes
shadow-build=no
hpijs-install=no
foomatic-drv-install=no
foomatic-ppd-install=no
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.15.11
restricted-build=no
ui-toolkit=qt4
qt3=no
qt4=yes
policy-kit=no
lite-build=no
udev_sysfs_rules=no
hpcups-only-build=no
hpijs-only-build=no
apparmor_build=no

Current contents of '/var/lib/hp/hplip.state' file:
Plugins are not installed. Could not access file: No such file or directory

Current contents of '~/.hplip/hplip.conf' file:
[upgrade]
notify_upgrade = false
last_upgraded_time = 1517763824
pending_upgrade_time = 0

[settings]
systray_visible = 0
systray_messages = 0

[last_used]
device_uri = "hp:/net/HP_LaserJet_4000_Series?ip=192.168.1.104"
printer_name =
working_dir = .

[commands]
scan = "/usr/bin/xscanimage "

[refresh]
rate = 30
enable = false
type = 1

[polling]
enable = false
interval = 5
device_list =

[fax]
voice_phone =
email_address =

[installation]
date_time = 02/04/2018 12:22:50
version = 3.15.11

 <Package-name> <Package-Desc> <Required/Optional> <Min-Version> <Installed-Version> <Status> <Comment>

--------------------------
| External Dependencies |
--------------------------

 gs GhostScript - PostScript and PDF language interpreter and previewer REQUIRED 7.05 9.10 OK -
 scanimage scanimage - Shell scanning program OPTIONAL 1.0 1.0.23 OK -
 error: xsane xsane - Graphical scanner frontend for SANE OPTIONAL 0.9 - MISSING 'xsane needs to be installed'
 cups CUPS - Common Unix Printing System REQUIRED 1.1 1.7.2 OK 'CUPS Scheduler is running'
 policykit PolicyKit - Administrative policy framework OPTIONAL - 0.105 OK -
 network network -wget OPTIONAL - 1.15 OK -
 error: avahi-utils avahi-utils OPTIONAL - - MISSING 'avahi-utils needs to be installed'
 dbus DBus - Message bus system REQUIRED - 1.6.18 OK -

-------------------------
| General Dependencies |
-------------------------

 libcrypto libcrypto - OpenSSL cryptographic library REQUIRED - 1.0.1 OK -
 python-dbus Python DBus - Python bindings for DBus REQUIRED 0.80.0 1.2.0 OK -
 reportlab Reportlab - PDF library for Python OPTIONAL 2.0 3.0 OK -
 python-notify Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL - - OK -
 pyqt4 PyQt 4- Qt interface for Python (for Qt version 4.x) REQUIRED 4.0 4.10.4 OK -
 python-xml Python XML libraries REQUIRED - 2.1.0 OK -
 libusb libusb - USB library REQUIRED - 1.0 OK -
 cups-image CUPS image - CUPS image development files REQUIRED - 1.7.2 OK -
 libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED 5.0.9 5.7.2 OK -
 sane-devel SANE - Scanning library development files REQUIRED - 1.0.23 OK -
 pil PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL - 1.1.7 OK -
 python2X Python 2.2 or greater - Python programming language REQUIRED 2.2 2.7.6 OK -
 pyqt4-dbus PyQt 4 DBus - DBus Support for PyQt4 REQUIRED 4.0 4.10.4 OK -
 libjpeg libjpeg - JPEG library REQUIRED - - OK -
 libpthread libpthread - POSIX threads library REQUIRED - 2.19 OK -
 python-devel Python devel - Python development files REQUIRED 2.2 2.7.6 OK -
 cups-devel CUPS devel- Common Unix Printing System development files REQUIRED - 1.7.2 OK -
 sane SANE - Scanning library REQUIRED - 1.0.23 OK -

---------------
| COMPILEDEP |
---------------

 libtool libtool - Library building support services REQUIRED - 2.4.2 OK -
 gcc gcc - GNU Project C and C++ Compiler REQUIRED - 4.8.4 OK -
 make make - GNU make utility to maintain groups of programs REQUIRED 3.0 3.81 OK -

----------------------
| Python Extentions |
----------------------

 cupsext CUPS-Extension REQUIRED - 3.15.11 OK -
 hpmudext IO-Extension REQUIRED - 3.15.11 OK -

-----------------------
| Scan Configuration |
-----------------------

 scanext Scan-SANE-Extension REQUIRED - 3.15.11 OK -
 hpaio HPLIP-SANE-Backend REQUIRED - 3.15.11 OK 'hpaio found in /etc/sane.d/dll.conf'

-----------------------
| Other Dependencies |
-----------------------

------------------------------
| DISCOVERED SCANNER DEVICES |
------------------------------

No Scanner found.

--------------------------
| DISCOVERED USB DEVICES |
--------------------------

No devices found.

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------

HP_LaserJet_4000
----------------
Type: Printer
Device URI: hp:/net/HP_LaserJet_4000_Series?ip=192.168.1.104
PPD: /etc/cups/ppd/HP_LaserJet_4000.ppd
PPD Description: HP LaserJet 4000 Series Postscript (recommended)
Printer status: printer HP_LaserJet_4000 is idle. enabled since Sun 04 Feb 2018 11:08:03 AM CST
Communication status: Good

j6450
-----
Type: Unknown
Device URI: socket://192.168.1.103
PPD: /etc/cups/ppd/j6450.ppd
PPD Description: HP Officejet j6400 Series, hpcups 3.14.3
Printer status: printer j6450 is idle. enabled since Sat 03 Feb 2018 08:29:17 PM CST

lj4000
------
Type: Unknown
Device URI: socket://192.168.1.104
PPD: /etc/cups/ppd/lj4000.ppd
PPD Description: HP LaserJet 4000 Series pcl3, hpcups 3.14.3
Printer status: printer lj4000 is idle. enabled since Sun 04 Feb 2018 11:04:59 AM CST
 Waiting for printer to finish.

--------------
| PERMISSION |
--------------

-----------
| SUMMARY |
-----------

Missing Required Dependencies
-----------------------------
None

Missing Optional Dependencies
-----------------------------

Total Errors: 2
Total Warnings: 2

Done.