The bundled version of firefox and custom intalled developer edition (by ppa) results in conflict

[Kostadin Anev]

After installing the FF DE I was not able to start the bundled firefox, the icon in the luncher was replaced with the FF DE's icon. Filtering applications by "Firefox" finds only the Developer Edition. The bigger problem is that when the Dev Edition is opened it seems that the other firefox starts in background too, because if you try to close the window of the DE you will get notification "Are you sure you wish to close all tabs" (or something like that) but only one tab is actually oppened. Both editions have complete sync enabled, not sure if that is not causing the problem.
Other thing is that the checkbox for "Allow Firefox Developer Edition and Firefox to run at the same time" does not remember unchecked state. I am un-checking, closing the tab, opening preferences again and the option is active again (checked).
It should be possible to use different editions separately as on windows.
Another thing is that after closing and starting firefox some times the tabs design is now like non DE tabs (they are not rectangular) and the header background too, but the developer tools are with the dark design, so that is very strange condition. I am attaching screen shot.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 49.0~a2~hg20160701r325253-0ubuntu1~umd1 [origin: LP-PPA-ubuntu-mozilla-daily-firefox-aurora]
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: koce 2028 F.... pulseaudio
BuildID: 20160701180553
Channel: aurora
CurrentDesktop: Unity
Date: Sun Jul 3 18:56:29 2016
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePlugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
DefaultProfilePrefSources:
 /usr/lib/firefox/defaults/pref/vendor-gre.js
 /usr/lib/firefox/defaults/pref/channel-prefs.js
 prefs.js
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-07-02 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IpRoute:
 default via 192.168.2.1 dev enp7s4 proto static metric 100
 default via 192.168.2.1 dev enp6s0 proto static metric 101
 169.254.0.0/16 dev enp7s4 scope link metric 1000
 192.168.2.0/24 dev enp7s4 proto kernel scope link src 192.168.2.122 metric 100
 192.168.2.0/24 dev enp6s0 proto kernel scope link src 192.168.2.195 metric 101
IwConfig:
 lo no wireless extensions.

 enp7s4 no wireless extensions.

 enp6s0 no wireless extensions.
Profile1Extensions: extensions.sqlite corrupt or missing
Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile1Locales: extensions.sqlite corrupt or missing
Profile1Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
Profile1PrefSources:
 /usr/lib/firefox/defaults/pref/vendor-gre.js
 /usr/lib/firefox/defaults/pref/channel-prefs.js
 prefs.js
Profile1Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile0 (Default) - LastVersion=47.0/20160606113944 (Out of date)
 Profile1 - LastVersion=49.0a2/20160701180553 (In use)
RfKill:

RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/28/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A16
dmi.board.name: 0CRH6C
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA16:bd05/28/2013:svnDellInc.:pnPrecisionWorkStationT5500:pvr:rvnDellInc.:rn0CRH6C:rvrA00:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T5500
dmi.sys.vendor: Dell Inc.