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Task manager won't close firefox already running but not responding

Posted

Firefox just stops running at random times. I used to be able to close it thru task manager no problem. Now when I try that nothing happens. The process highlights and just stays there running no matter how many times I click it. I can close other processes just fine. Firefox hangs a lot more often lately and it's a pain to have to constantly shut down and restart to clear it. Firefox hangs while in different websites or even after I've closed it but haven't shut down since. When I try to reopen it I get the "already running not responding" message. But even when I close normally it still seems to stay on in the background. I'm not tech savvy at all so any solution would be appreciated. Thanks.

Chosen solution

You will need to get to the bottom of this problem and try to prevent it happening in the future

  1. First of all create and use a new additional Firefox profile. I am hoping that will result in at least a Firefox that you can close-down.
    Use the Profile Manager to create and remove Firefox profiles_creating-a-profile
  2. Note that normally the method of closing down Firefox is to use the Firefox menus | Firefox-button. (Using other methods may create problems, & there are some current / recent bugs Bug 845681 & 8537799 )
    • By default on XP File -> Quit , (Other systems use the Firefox button options)
  3. What you are experiencing appears to be a Firefox hang, although they may often be terminated by killing the Firefox process.
    Firefox hangs or is not responding - How to fix
  4. Sometimes after multiple problems Firefox will have multiple copies of the restore files, and although you could loose some information | tabs deleting these non functional copies may be required to resolve the matter
Read this answer in context 3

Additional System Details

Installed Plug-ins

  • VLC media player Web Plugin 2.0.6
  • Next Generation Java Plug-in 10.21.2 for Mozilla browsers
  • Shockwave Flash 11.6 r602
  • 0.3
  • Uplay PC Plugin
  • Google Update
  • iTunes Detector Plug-in
  • Adobe PDF Plug-In For Firefox and Netscape 11.0.02
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • RealPlayer Download Plugin
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • RealNetworks(tm) RealDownloader Chrome Background Extension Plug-In
  • RealNetworks(tm) RealDownloader PepperFlashVideoShim Plug-In
  • RealNetworks(tm) RealDownloader HTML5VideoShim Plug-In
  • RealDownloader Plugin
  • 5.1.10411.0
  • DivX Plus Web Player version 2.2.0.52
  • DivX VOD Helper Plug-in
  • npapicomadapter
  • Adobe Shockwave for Director Netscape plug-in, version 11.5
  • NPWLPG
  • Yahoo Application State Plugin version 1.0.0.7
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • DRM Netscape Network Object
  • Npdsplay dll
  • DRM Store Netscape Plugin
  • Office Plugin for Netscape Navigator

Application

  • Firefox 20.0.1
  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:20.0) Gecko/20100101 Firefox/20.0
  • Support URL: http://support.mozilla.org/1/firefox/20.0.1/WINNT/en-US/

Extensions

  • Adblock Plus 2.2.3 ({d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d})
  • Advanced SystemCare Surfing Protection 1.0 (ascsurfingprotection@iobit.com)
  • Firefox Sync 1.7 ({340c2bbc-ce74-4362-90b5-7c26312808ef})
  • FlashGot 1.5.5.2 ({19503e42-ca3c-4c27-b1e2-9cdb2170ee34})
  • Greasemonkey 1.8 ({e4a8a97b-f2ed-450b-b12d-ee082ba24781})
  • Java Console 6.0.33 ({CAFEEFAC-0016-0000-0033-ABCDEFFEDCBA})
  • Linkification 1.3.8 ({35106bca-6c78-48c7-ac28-56df30b51d2a})
  • RealDownloader 1.3.0 ({34712C68-7391-4c47-94F3-8F88D49AD632})
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • Xmarks 4.1.3 (foxmarks@kei.com)
  • DivX Plus Web Player HTML5 <video> 2.1.2.145 ({23fcfd51-4958-4f00-80a3-ae97e717ed8b}) (Inactive)
  • Google Toolbar for Firefox 7.1.20110512W ({3112ca9c-de6d-4884-a869-9855de68056c}) (Inactive)
  • Java Console 6.0.35 ({CAFEEFAC-0016-0000-0035-ABCDEFFEDCBA}) (Inactive)
  • Microsoft .NET Framework Assistant 1.2.1 ({20a82645-c095-46ed-80e3-08825760534b}) (Inactive)
  • Microsoft Choice Guard 2.0 (ChoiceGuard@Microsoft) (Inactive)
  • Norton Safe Web Lite Toolbar 2012.1.1.16 ({203FB6B2-2E1E-4474-863B-4C483ECCE78E}) (Inactive)
  • Skype Click to Call 6.8.0.12323 ({82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}) (Inactive)
  • Update Notifier 0.1.5.5 ({95f24680-9e31-11da-a746-0800200c9a66}) (Inactive)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription: NVIDIA GeForce 9600 GSO
  • adapterDescription2:
  • adapterDeviceID: 0x0610
  • adapterDeviceID2:
  • adapterDrivers: nv4_disp
  • adapterDrivers2:
  • adapterRAM: Unknown
  • adapterRAM2:
  • adapterVendorID: 0x10de
  • adapterVendorID2:
  • direct2DEnabled: False
  • direct2DEnabledMessage: [u'']
  • directWriteEnabled: False
  • directWriteVersion: 0.0.0.0
  • driverDate: 12-29-2012
  • driverDate2:
  • driverVersion: 6.14.13.1090
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'cairo', u'AzureFallbackCanvasBackend': u'none', u'AzureContentBackend': u'none'}
  • isGPU2Active: False
  • numAcceleratedWindows: 3
  • numTotalWindows: 3
  • webglRenderer: Google Inc. -- ANGLE (NVIDIA GeForce 9600 GSO)
  • windowLayerManagerType: Direct3D 9

Modified Preferences

  • accessibility.blockautorefresh: True
  • accessibility.typeaheadfind: True
  • browser.cache.disk.capacity: 1048576
  • browser.cache.disk.smart_size.first_run: False
  • browser.cache.disk.smart_size_cached_value: 890880
  • browser.cache.memory.capacity: 65536
  • browser.display.background_color: #C0C0C0
  • browser.display.show_image_placeholders: True
  • browser.display.use_system_colors: True
  • browser.fixup.alternate.enabled: False
  • browser.history_expire_days.mirror: 40
  • browser.places.importBookmarksHTML: False
  • browser.places.importDefaults: False
  • browser.places.leftPaneFolderId: -1
  • browser.places.migratePostDataAnnotations: False
  • browser.places.smartBookmarksVersion: 4
  • browser.places.updateRecentTagsUri: False
  • browser.startup.homepage: www.msn.com
  • browser.startup.homepage_override.buildID: 20130409194949
  • browser.startup.homepage_override.mstone: 20.0.1
  • browser.tabs.loadInBackground: False
  • browser.urlbar.autocomplete.enabled: True
  • browser.urlbar.autofill: True
  • browser.zoom.full: False
  • dom.mozApps.used: True
  • dom.w3c_touch_events.expose: False
  • extensions.lastAppVersion: 20.0.1
  • general.useragent.extra.microsoftdotnet: ( )
  • network.cookie.prefsMigrated: True
  • network.http.max-connections: 48
  • network.http.max-connections-per-server: 16
  • network.http.max-persistent-connections-per-proxy: 16
  • network.http.max-persistent-connections-per-server: 8
  • network.http.pipelining: True
  • network.http.pipelining.maxrequests: 8
  • network.http.proxy.pipelining: True
  • network.http.proxy.version: 1.0
  • network.http.request.max-start-delay: 0
  • places.database.lastMaintenance: 1366871266
  • places.history.expiration.transient_current_max_pages: 80490
  • places.history.expiration.transient_optimal_database_size: 128782662
  • places.last_vacuum: 1315909144
  • plugin.disable_full_page_plugin_for_types: video/3gpp,audio/3gpp,audio/3gpp2,video/3gpp2,video/divx,video/mpeg,video/x-mpeg,audio/mp4,video/mp4,video/quicktime,video/x-ms-wm,video/x-ms-wmv,application/x-mplayer2,audio/mpeg,audio/x-mpeg,video/x-m4v,application/pdf
  • plugin.expose_full_path: True
  • privacy.clearOnShutdown.cookies: False
  • privacy.clearOnShutdown.downloads: False
  • privacy.clearOnShutdown.formdata: False
  • privacy.clearOnShutdown.history: False
  • privacy.clearOnShutdown.sessions: False
  • privacy.cpd.cookies: False
  • privacy.cpd.downloads: False
  • privacy.cpd.formdata: False
  • privacy.cpd.history: False
  • privacy.cpd.sessions: False
  • privacy.donottrackheader.enabled: True
  • privacy.popups.showBrowserMessage: False
  • privacy.sanitize.migrateFx3Prefs: True
  • privacy.sanitize.promptOnSanitize: False
  • privacy.sanitize.sanitizeOnShutdown: True
  • privacy.sanitize.timeSpan: 0
  • security.enable_ssl2: True
  • security.enable_tls: False
  • security.warn_viewing_mixed: False

Misc

  • User JS: Yes
  • Accessibility: No
John99
  • Top 25 Contributor
  • Moderator
622 solutions 8029 answers

Chosen Solution

You will need to get to the bottom of this problem and try to prevent it happening in the future

  1. First of all create and use a new additional Firefox profile. I am hoping that will result in at least a Firefox that you can close-down.
    Use the Profile Manager to create and remove Firefox profiles_creating-a-profile
  2. Note that normally the method of closing down Firefox is to use the Firefox menus | Firefox-button. (Using other methods may create problems, & there are some current / recent bugs Bug 845681 & 8537799 )
    • By default on XP File -> Quit , (Other systems use the Firefox button options)
  3. What you are experiencing appears to be a Firefox hang, although they may often be terminated by killing the Firefox process.
    Firefox hangs or is not responding - How to fix
  4. Sometimes after multiple problems Firefox will have multiple copies of the restore files, and although you could loose some information | tabs deleting these non functional copies may be required to resolve the matter
cor-el
  • Top 10 Contributor
  • Moderator
10756 solutions 96808 answers

If there are plugin-container processes then try to close those first and see if you then can close Firefox.

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

Question owner

thank you.

John99
  • Top 25 Contributor
  • Moderator
622 solutions 8029 answers

Glad you fixed it.Thanks for posting back.