Poor performance with flash player

[asu]

Firefox last version( firefox-54.0) have poor results ,on combination with flash-player, low frame rate,and others.
With firefox-53.0.3 works like charm.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 54.0+build3-0ubuntu0.16.04.1
Uname: Linux 4.6.2+ x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.6
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: asu 3352 F.... pulseaudio
BuildID: 20170612122310
Channel: Unavailable
CurrentDesktop: MATE
Date: Sat Jun 24 20:24:14 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 2016-04-29 (421 days ago)
InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IpRoute:
 default via 192.168.16.1 dev enp1s0 proto static metric 100
 169.254.0.0/16 dev enp1s0 scope link metric 1000
 192.168.16.0/24 dev enp1s0 proto kernel scope link src 192.168.16.10 metric 100
IwConfig:
 sit0 no wireless extensions.

 lo no wireless extensions.

 enp1s0 no wireless extensions.
Locales: extensions.sqlite corrupt or missing
Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=53.0.3/20170518070317 (Out of date)
RfKill:

RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/08/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: S0101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: To be filled by O.E.M.
dmi.board.vendor: To be filled by O.E.M.
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrS0101:bd07/08/2008:svnOlidataS.p.A.:pnALABAMA:pvrToBeFilledByO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: ALABAMA
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: Olidata S.p.A.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.