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When I get a message 'A plugin is needed to display this content', how do I find which plugin is needed?

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This arises, for example, on this page http://www.telegraph.co.uk/news/newstopics/howaboutthat/11204874/Quiz-Quirky-British-influences-across-the-world.html

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Installed Plug-ins

  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Google Update
  • Shockwave Flash 15.0 r0
  • McAfee MSC FF plugin DLL
  • Adobe PDF Plug-In For Firefox and Netscape 11.0.9
  • 5.1.30514.0
  • iTunes Detector Plug-in
  • Picasa plugin
  • GEPlugin
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers

Application

  • Firefox 33.0.2
  • User Agent: Mozilla/5.0 (Windows NT 6.0; rv:33.0) Gecko/20100101 Firefox/33.0
  • Support URL: https://support.mozilla.org/1/firefox/33.0.2/WINNT/en-GB/

Extensions

  • Adblock Plus 2.6.5 ({d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d})
  • FastestFox 5.2.1 (smarterwiki@wikiatic.com)
  • McAfee Security Scan Plus 1.0 ({e4f94d1e-2f53-401e-8885-681602c0ddd8})
  • McAfee SiteAdvisor 3.7.1 ({4ED1F68A-5463-4931-9384-8FFF5ED91D92})
  • Microsoft .NET Framework Assistant 0.0.0 ({20a82645-c095-46ed-80e3-08825760534b})
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • ThinkVantage Password Manager 3.0 ({FCF36B88-1BBA-487f-B64B-D2E8980A9293}) (Inactive)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription: Mobile Intel(R) 965 Express Chipset Family
  • adapterDescription2:
  • adapterDeviceID: 0x2a02
  • adapterDeviceID2:
  • adapterDrivers: igdumdx32 igd10umd32
  • adapterDrivers2:
  • adapterRAM: Unknown
  • adapterRAM2:
  • adapterVendorID: 0x8086
  • adapterVendorID2:
  • direct2DEnabled: False
  • direct2DEnabledMessage: [u'tryNewerDriver', u'7.1500.1000.1666']
  • directWriteEnabled: False
  • directWriteVersion: 7.0.6002.23200
  • driverDate: 10-7-2008
  • driverDate2:
  • driverVersion: 7.15.10.1576
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'skia', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'cairo', u'AzureSkiaAccelerated': 0}
  • isGPU2Active: False
  • numAcceleratedWindows: 0
  • numAcceleratedWindowsMessage: [u'tryNewerDriver', u'7.1500.1000.1666']
  • numTotalWindows: 2
  • webglRendererMessage: [u'tryNewerDriver', u'7.1500.1000.1666']
  • windowLayerManagerRemote: True
  • windowLayerManagerType: Basic

Modified Preferences

  • accessibility.typeaheadfind: True
  • accessibility.typeaheadfind.flashBar: 0
  • 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.cache.frecency_experiment: 2
  • browser.display.use_system_colors: True
  • browser.history_expire_days.mirror: 180
  • browser.link.open_newwindow: 2
  • browser.newtab.url: about:blank
  • browser.places.importBookmarksHTML: False
  • browser.places.smartBookmarksVersion: 7
  • browser.search.useDBForOrder: True
  • browser.sessionstore.enabled: True
  • browser.sessionstore.upgradeBackup.latestBuildID: 20141027150301
  • browser.startup.homepage_override.buildID: 20141027150301
  • browser.startup.homepage_override.mstone: 33.0.2
  • browser.tabs.warnOnClose: False
  • dom.disable_open_during_load: False
  • dom.max_chrome_script_run_time: 0
  • dom.max_script_run_time: 0
  • dom.mozApps.used: True
  • extensions.lastAppVersion: 33.0.2
  • font.internaluseonly.changed: True
  • font.size.variable.x-western: 14
  • keyword.URL: https://uk.search.yahoo.com/search?fr=mcafee&type=B111GB0D20140712&p=
  • media.gmp-gmpopenh264.enabled: True
  • media.gmp-gmpopenh264.lastUpdate: 1413568258
  • media.gmp-gmpopenh264.version: 1.1
  • media.gmp-manager.lastCheck: 1414949140
  • network.cookie.prefsMigrated: True
  • places.database.lastMaintenance: 1415020757
  • places.history.expiration.transient_current_max_pages: 80260
  • places.last_vacuum: 1309624805
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • plugin.importedState: True
  • plugin.state.java: 0
  • plugin.state.npctrl: 2
  • plugin.state.npmcsnffpl: 2
  • plugin.state.nppdf: 2
  • plugin.state.nppicasa: 2
  • plugin.state.npqtplugin: 2
  • plugin.state.npwpf: 2
  • privacy.donottrackheader.enabled: True
  • privacy.sanitize.migrateFx3Prefs: True
  • security.warn_entering_weak: False
  • security.warn_viewing_mixed: False
  • storage.vacuum.last.index: 1
  • storage.vacuum.last.places.sqlite: 1414683986

Misc

  • User JS: Yes
  • Accessibility: No
cor-el
  • Top 10 Contributor
  • Moderator
17526 solutions 158473 answers

That is an issue with an embed container that uses type="text/html" and that doesn't work with Firefox.

<embed height="200" width="460" style="overflow: hidden" type="text/html" scrollbars="no" src="http://pages.email<i></i>.telegraph<i></i>.co<i></i>.uk/page.aspx?QS=2e4c31a3756cb94055431b810b2ec2cf6bfd7f13bf80456f59d89233488b9ea1"></embed>

A possible bookmarklet to change this embed to an iframe:

javascript:(function(){var cE='iframe',eE=document.querySelectorAll('embed');for(i=0;E=eE[i];i++){N=document.createElement(cE);for(j in E.attributes){A=E.attributes[j];if((A.name!=undefined)&&(A.value!=undefined)){N.setAttribute(A.name,A.value)}}E.parentNode.replaceChild(N,E)}})()
That is an issue with an embed container that uses type="text/html" and that doesn't work with Firefox. <pre>&lt;embed height="200" width="460" style="overflow: hidden" type="text/html" scrollbars="no" src="http://pages.email&lt;i&gt;&lt;/i&gt;.telegraph&lt;i&gt;&lt;/i&gt;.co&lt;i&gt;&lt;/i&gt;.uk/page.aspx?QS=2e4c31a3756cb94055431b810b2ec2cf6bfd7f13bf80456f59d89233488b9ea1"&gt;&lt;/embed&gt;</pre> A possible bookmarklet to change this embed to an iframe: <pre><nowiki> javascript:(function(){var cE='iframe',eE=document.querySelectorAll('embed');for(i=0;E=eE[i];i++){N=document.createElement(cE);for(j in E.attributes){A=E.attributes[j];if((A.name!=undefined)&&(A.value!=undefined)){N.setAttribute(A.name,A.value)}}E.parentNode.replaceChild(N,E)}})()</nowiki></pre>