[Bug 1711385] [NEW] Firefox slows down accidently. Even stops for long-long seconds, responds poorly.

[Géza Molnár]

Public bug reported:

No idea what's the cause. When I close tabs the situation does not
change. Sometimes I have couple of 10s of tabs open, sometimes (right
now) only few.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: firefox 56.0~b3+build1-0ubuntu0.17.04.2 [origin: LP-PPA-mozillateam-firefox-next]
ProcVersionSignature: Ubuntu 4.10.0-33.37-generic 4.10.17
Uname: Linux 4.10.0-33-generic x86_64
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.10.0-33-generic.
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC888 Analog [ALC888 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  molnar_geza   1054 F.... pulseaudio
 /dev/snd/controlC1:  molnar_geza   1054 F.... pulseaudio
BuildID: 20170816165121
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfdef8000 irq 32'
   Mixer name	: 'Realtek ALC888'
   Components	: 'HDA:10ec0888,14622260,00100001'
   Controls      : 33
   Simple ctrls  : 15
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfebec000 irq 33'
   Mixer name	: 'ATI R6xx HDMI'
   Components	: 'HDA:1002aa01,00aa0100,00100000'
   Controls      : 7
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined
   Playback channels: Mono
   Mono: Playback [on]
Channel: beta
CurrentDesktop: LXDE
Date: Thu Aug 17 16:48:11 2017
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePlugins:
 Google Talk Plugin Video Renderer - /opt/google/talkplugin/libnpo1d.so (google-talkplugin)
 Google Talk Plugin - /opt/google/talkplugin/libnpgoogletalk.so (google-talkplugin)
 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
IpRoute:
 default via 192.168.0.1 dev wlp2s0 proto static metric 600 
 192.168.0.0/24 dev wlp2s0 proto kernel scope link src 192.168.0.19 metric 600
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=56.0/20170816165121 (In use)
 Profile1 - LastVersion=56.0/20170811072257 (Out of date)
RelatedPackageVersions: google-talkplugin 5.41.3.0-1
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to zesty on 2017-05-10 (99 days ago)
dmi.bios.date: 09/09/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: A1226IMS V1.01
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: MS-1226
dmi.board.vendor: MSI
dmi.board.version: Ver 1.000
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.:bvrA1226IMSV1.01:bd09/09/2008:svnMicro-StarInternational:pnMEGABOOKPX200:pvrVer1.000:rvnMSI:rnMS-1226:rvrVer1.000:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: MEGA BOOK PX200
dmi.product.version: Ver 1.000
dmi.sys.vendor: Micro-Star International

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


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

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Title:
  Firefox slows down accidently. Even stops for long-long seconds,
  responds poorly.

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