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...@firefox.mozilla.org Russian (RU) Language Pack - langpack...@firefox.mozilla.org English (GB) Language Pack - langpack-en...@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or missing Profiles: Profile0 (Default) - LastVersion=50.1.0/20161209095719 Profile1 - LastVersion=30.0/20140608211208 (Out of date) RelatedPackageVersions: google-talkplugin 5.41.3.0-1 adobe-flashplugin 1:20170110.1-0ubuntu0.16.04.1 RunningIncompatibleAddons: True SourcePackage: firefox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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1658739 Title: Javascript "Slow script" message blocks Firefox exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1658739/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs