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what do I do when my silverlight plug quits responding


When I am on a website like facebook or netflix I get a message stating that the silverlight plug in has quit responding do I want to close it or continue. It has stopped responding when I am playing in a facebook game called farmtown and it has also quit when I am using netflix and watching videos. Is this plug in important and do I have to have it?

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.7 r700
  • Next Generation Java Plug-in 10.21.2 for Mozilla browsers
  • Adobe Shockwave for Director Netscape plug-in, version
  • Unity Player 4.1.2f1
  • npsitesafety
  • 5.1.20125.0
  • npapicomadapter
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Adobe Acrobat Plug-In Version 7.00 for Netscape


  • 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/


  • AVG Security Toolbar (avg@toolbar)
  • TelevisionFanatic (64ffxtbr@TelevisionFanatic.com)
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • Ask Toolbar 12.44988 (toolbar_FAS-V6@apn.ask.com) (Inactive)
  • Yontoo 1.20.02 (plugin@yontoo.com) (Inactive)


  • incrementalGCEnabled: True


  • adapterDescription: Mobile Intel(R) 945GM Express Chipset Family
  • adapterDescription2:
  • adapterDeviceID: 0x27a2
  • adapterDeviceID2:
  • adapterDrivers: ialmrnt5
  • adapterDrivers2:
  • adapterRAM: Unknown
  • adapterRAM2:
  • adapterVendorID: 0x8086
  • adapterVendorID2:
  • direct2DEnabled: False
  • direct2DEnabledMessage: [u'blockedDriver']
  • directWriteEnabled: False
  • directWriteVersion:
  • driverDate: 3-23-2006
  • driverDate2:
  • driverVersion:
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'cairo', u'AzureFallbackCanvasBackend': u'none', u'AzureContentBackend': u'none'}
  • isGPU2Active: False
  • numAcceleratedWindows: 0
  • numAcceleratedWindowsMessage: [u'tryNewerDriver', u'6.1400.1000.4926']
  • numTotalWindows: 1
  • webglRendererMessage: [u'tryNewerDriver', u'6.1400.1000.4926']
  • windowLayerManagerType: Basic

Modified Preferences

  • browser.cache.disk.capacity: 358400
  • browser.cache.disk.smart_size.first_run: False
  • browser.cache.disk.smart_size.use_old_max: False
  • browser.cache.disk.smart_size_cached_value: 358400
  • browser.places.smartBookmarksVersion: 4
  • browser.privatebrowsing.dont_prompt_on_enter: True
  • browser.startup.homepage: https://www.facebook.com/
  • browser.startup.homepage_override.buildID: 20130409194949
  • browser.startup.homepage_override.mstone: 20.0.1
  • dom.mozApps.used: True
  • dom.w3c_touch_events.expose: False
  • extensions.lastAppVersion: 20.0.1
  • network.cookie.prefsMigrated: True
  • places.database.lastMaintenance: 1367625787
  • places.history.expiration.transient_current_max_pages: 26581
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • privacy.cpd.offlineApps: True
  • privacy.cpd.sessions: False
  • privacy.cpd.siteSettings: True
  • privacy.sanitize.migrateFx3Prefs: True
  • privacy.sanitize.timeSpan: 0


  • User JS: Yes
  • Accessibility: No
finitarry 157 solutions 2178 answers

If you want to access Silverlight media, you need that plugin. You could check to see if you have the most recent version here:

These references might help:

Question owner

I have the most recent version of silverlight I uninstalled it and then reinstalled it to make sure. The trouble I am having still exists I am still getting the same message telling me that the silverlight plug in is either busy or not responding do I want to wait or cancel. When I click either wait or cancel mozilla freezes up and quits responding. I know I have to have the plugin but it is not doing what it is supposed to be doing.

finitarry 157 solutions 2178 answers

Another thing you might try is bypassing the plugin container. I had to do that with Real Media. Go into the about:config list and add a setting to bypass Silverlight using this format:

dom.ipc.plugins.enabled.i386.[silverlight plugin filename].dll - set to false

I am not sure what the name of the silverlight plugin is for Windows, since I use Mac OS. It might be as simple as "npsilverlight.dll".

  • Top 10 Contributor
  • Moderator
10780 solutions 97024 answers

That would be: dom.ipc.plugins.enabled.npctrl.dll

Question owner

how do I do this I use windows xp and mozilla firefox as my browser. That is where the plugin is messing up.

finitarry 157 solutions 2178 answers

Add the setting in the about:config window.