[Bug 1658739] [NEW] Javascript "Slow script" message blocks Firefox exit

[Volodya]

Public bug reported:

If the computer is running out of memory and one attempts to shut down
Firefox while there're some scripts that are running continously(*) you
get the "Do you want to stop the script?" message. And that message
actually blocks Firefox from exiting despite the fact that the exit was
initiated before the message appeared.

(*) In my case the script was the Chat-Window script on VK.com (Russian
social media site).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 50.1.0+build2-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC0D0p:   volodya    2950 F...m pulseaudio
 /dev/snd/controlC0:  volodya    2950 F.... pulseaudio
BuildID: 20161209095719
Channel: Unavailable
CurrentDesktop: XFCE
Date: Mon Jan 23 20:13:28 2017
DefaultProfileIncompatibleExtensions:
 English (South Africa) Language Pack - langpack-en-ZA at firefox.mozilla.org
 Russian (RU) Language Pack - langpack-ru at firefox.mozilla.org
 English (GB) Language Pack - langpack-en-GB at firefox.mozilla.org
 Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
DefaultProfilePlugins:
 Google Talk Plugin - /opt/google/talkplugin/libnpgoogletalk.so (google-talkplugin)
 Google Talk Plugin Video Renderer - /opt/google/talkplugin/libnpo1d.so (google-talkplugin)
 Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin)
DefaultProfilePrefSources: prefs.js
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2015-01-19 (735 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
IpRoute:
 default via 192.168.1.1 dev wlan0  proto static  metric 600 
 169.254.0.0/16 dev wlan0  scope link  metric 1000 
 192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.5  metric 600
MostRecentCrashID: bp-f36c5229-fdc5-4162-8935-6cbb22150802
Profile1Extensions: extensions.sqlite corrupt or missing
Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile1Locales: extensions.sqlite corrupt or missing
Profile1PrefSources: prefs.js
Profile1Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile0 (Default) - LastVersion=50.1.0/20161209095719
 Profile1 - LastVersion=30.0/20140608211208 (Out of date)
RelatedPackageVersions:
 google-talkplugin 5.41.3.0-1
 adobe-flashplugin 1:20170110.1-0ubuntu0.16.04.1
RunningIncompatibleAddons: True
SourcePackage: firefox
SubmittedCrashIDs: bp-f36c5229-fdc5-4162-8935-6cbb22150802
UpgradeStatus: Upgraded to xenial on 2016-07-29 (178 days ago)
dmi.bios.date: 05/24/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: N76VB.205
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: N76VB
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN76VB.205:bd05/24/2013:svnASUSTeKCOMPUTERINC.:pnN76VB:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN76VB:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: N76VB
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

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


** Tags: amd64 apport-bug xenial

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Title:
  Javascript "Slow script" message blocks Firefox exit

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