[Bug 1795201] [NEW] firefox wil not starting up anymore gtk-warning

[Johnsandman]

Public bug reported:

Inupdates I had a chroom problem it was solved after the updates again,
but now i cannot acces firefox  this what I get Gtk-WARNING **:
06:19:24.013: Theme parsing error: <data>:1:34: Expected ')' in color
definition

I have wiped the whole ./mozilla directory and was searching for gtk3 css which i couldn't find just the ini files. I
This problem came after some upgrades where chroom is working again good. But need firefox for some other reason.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: firefox 62.0+build2-0ubuntu0.18.04.5
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
NonfreeKernelModules: nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  gerda-johan   2078 F.... pulseaudio
 /dev/snd/controlC1:  gerda-johan   2078 F.... pulseaudio
 /dev/snd/controlC0:  gerda-johan   2078 F.... pulseaudio
BuildID: 20180913170256
Channel: Unavailable
CurrentDesktop: KDE
Date: Sun Sep 30 06:21:21 2018
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo enp2s0
 iface lo enp2s0 inet dhcp
InstallationDate: Installed on 2018-05-28 (124 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
NoProfiles: True
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/26/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3.E0
dmi.board.asset.tag: Default string
dmi.board.name: B150M PRO-VDH (MS-7982)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.E0:bd12/26/2016:svnMSI:pnMS-7982:pvr1.0:rvnMSI:rnB150MPRO-VDH(MS-7982):rvr1.0:cvnMSI:ct3:cvr1.0:
dmi.product.family: Default string
dmi.product.name: MS-7982
dmi.product.version: 1.0
dmi.sys.vendor: MSI

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


** Tags: amd64 apport-bug bionic

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Title:
  firefox wil not starting up anymore gtk-warning

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