[Bug 1719209] [NEW] firefox opens nautilus inside XCFE desktop

[Felix]

Public bug reported:

firefox opens nautilus inside XCFE desktop whereas XCFE file browser
thunar ought to be opened.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: firefox 55.0.2+build1-0ubuntu0.17.04.1
ProcVersionSignature: Ubuntu 4.10.0-35.39-generic 4.10.17
Uname: Linux 4.10.0-35-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  felix      1568 F.... pulseaudio
BuildID: 20170816204344
Channel: Unavailable
CurrentDesktop: XFCE
Date: Sun Sep 24 22:23:52 2017
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2017-06-14 (101 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
IpRoute:
 default via 192.168.1.1 dev wlp4s0 proto static metric 600 
 169.254.0.0/16 dev wlp4s0 scope link metric 1000 
 192.168.1.0/24 dev wlp4s0 proto kernel scope link src 192.168.1.2 metric 600
Locales: extensions.sqlite corrupt or missing
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=55.0.2/20170816204344 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/12/2012
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: V1.12
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Aspire V5-571G
dmi.board.vendor: Acer
dmi.board.version: V1.12
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.12
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV1.12:bd06/12/2012:svnAcer:pnAspireV5-571G:pvrV1.12:rvnAcer:rnAspireV5-571G:rvrV1.12:cvnAcer:ct9:cvrV1.12:
dmi.product.name: Aspire V5-571G
dmi.product.version: V1.12
dmi.sys.vendor: Acer

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages zesty

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Title:
  firefox opens nautilus inside XCFE desktop

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