Public bug reported:

Since a recent update, probably the one that added sandboxed tabs, frequently 
one or more tabs become unselectable. This can be a tab with content or an 
emtpy/new tab.
The result is that the tab cannot be selected, and cannot be closed until a 
restart.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 56.0+build6-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-92.115-generic 4.4.76
Uname: Linux 4.4.0-92-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  <user>    3038 F.... pulseaudio
BuildID: 20171003101344
Channel: Unavailable
CurrentDesktop: Unity
Date: Mon Oct 30 06:21:24 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 2016-02-19 (618 days ago)
InstallationMedia: It
IpRoute:
 default via 192.168.178.1 dev wlp3s0  proto static  metric 600
 169.254.0.0/16 dev wlp3s0  scope link  metric 1000
 192.168.178.0/24 dev wlp3s0  proto kernel  scope link  src 192.168.178.30  
metric 600
Locales: extensions.sqlite corrupt or missing
Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so 
(adobe-flashplugin)
PrefSources: prefs.js
ProcEnviron:
 LANGUAGE=de_DE
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=56.0/20171003101344 (In use)
RelatedPackageVersions: adobe-flashplugin 1:20171025.1-0ubuntu0.16.04.1
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/03/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ETA6WW (2.66 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2325TT1
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvrG2ETA6WW(2.66):bd03/03/2016:svnLENOVO:pn2325TT1:pvrThinkPadX230:rvnLENOVO:rn2325TT1:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2325TT1
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO

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


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

** Description changed:

  Since a recent update, probably the one that added sandboxed tabs, frequently 
one or more tabs become unselectable. This can be a tab with content or an 
emtpy/new tab.
  The result is that the tab cannot be selected, and cannot be closed until a 
restart.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: firefox 56.0+build6-0ubuntu0.16.04.2
  ProcVersionSignature: Ubuntu 4.4.0-92.115-generic 4.4.76
  Uname: Linux 4.4.0-92-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  florian    3038 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  <user>    3038 F.... pulseaudio
  BuildID: 20171003101344
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Mon Oct 30 06:21:24 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
+  # 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 2016-02-19 (618 days ago)
  InstallationMedia: It
  IpRoute:
-  default via 192.168.178.1 dev wlp3s0  proto static  metric 600 
-  169.254.0.0/16 dev wlp3s0  scope link  metric 1000 
-  192.168.178.0/24 dev wlp3s0  proto kernel  scope link  src 192.168.178.30  
metric 600
+  default via 192.168.178.1 dev wlp3s0  proto static  metric 600
+  169.254.0.0/16 dev wlp3s0  scope link  metric 1000
+  192.168.178.0/24 dev wlp3s0  proto kernel  scope link  src 192.168.178.30  
metric 600
  Locales: extensions.sqlite corrupt or missing
  Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so 
(adobe-flashplugin)
  PrefSources: prefs.js
  ProcEnviron:
-  LANGUAGE=de_DE
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=de_DE
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=56.0/20171003101344 (In use)
  RelatedPackageVersions: adobe-flashplugin 1:20171025.1-0ubuntu0.16.04.1
  RfKill:
-  0: phy0: Wireless LAN
-       Soft blocked: no
-       Hard blocked: no
+  0: phy0: Wireless LAN
+   Soft blocked: no
+   Hard blocked: no
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/03/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ETA6WW (2.66 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2325TT1
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG2ETA6WW(2.66):bd03/03/2016:svnLENOVO:pn2325TT1:pvrThinkPadX230:rvnLENOVO:rn2325TT1:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2325TT1
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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https://bugs.launchpad.net/bugs/1728506

Title:
  various tabs are unresponsive since 55 or so

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