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whenever I start Firefox I get the following message: "Well, this is embarrassing. Firefox is having trouble recovering your windows and tabs.


Whenever I start Firefox I get the following message:

"Well, this is embarrassing. Firefox is having trouble recovering your windows and tabs. This is usually caused by a recently opened web page. You can try: "Removing one or more tabs that you think may be causing the problem "Starting an entirely new browsing session"

Problem persists when relaunching FF in safe mode. Problem is temporarily solved by resetting FF, but repeats and persists after navigating to any page (such as wikipedia.org), closing all tabs, quitting FF, and relaunching FF. FF pref "When FF Starts" is set to home page by default, and FF home page is set to Mozilla FF start page by default. Changing this pref "Show Blank Page" has no effect on the behavior.

Mac OS System Pref "Close windows when quitting an app" is ticked (by default). Unticking this box does not change this FF error.

2011 13" MacBook Pro Mac OS 10.8.3 Mountain Lion Firefox 20.0

Datos adicionales del sistema

Plugins instalados

  • A plugin to detect whether the Adobe Extension Manager is installed on this machine.
  • Displays Java applet content, or a placeholder if Java is not installed.
  • Shockwave Flash 11.6 r602
  • 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 for Web Browsers, Version 11.0.02
  • Microsoft Office for Mac SharePoint Browser Plug-in


  • Firefox 20.0
  • Agente de usuario: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:20.0) Gecko/20100101 Firefox/20.0
  • URL de asistencia: http://support.mozilla.org/1/firefox/20.0/Darwin/en-US/


  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • Adobe Acrobat - Create PDF 1.2 (web2pdfextension@web2pdf.adobedotcom) (inactivo)


  • incrementalGCEnabled: True


  • adapterDescription:
  • adapterDeviceID: 0x 126
  • adapterDrivers:
  • adapterRAM:
  • adapterVendorID: 0x8086
  • driverDate:
  • driverVersion:
  • info: {u'AzureContentBackend': u'none', u'AzureCanvasBackend': u'quartz', u'AzureFallbackCanvasBackend': u'none'}
  • numAcceleratedWindows: 1
  • numTotalWindows: 1
  • webglRenderer: Intel Inc. -- Intel HD Graphics 3000 OpenGL Engine
  • windowLayerManagerType: OpenGL

Preferencias modificadas

  • 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.startup.homepage_override.buildID: 20130326150557
  • browser.startup.homepage_override.mstone: 20.0
  • dom.w3c_touch_events.expose: False
  • extensions.lastAppVersion: 20.0
  • gfx.blacklist.webgl.msaa: 4
  • network.cookie.prefsMigrated: True
  • places.history.expiration.transient_current_max_pages: 104858
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • privacy.sanitize.migrateFx3Prefs: True


  • JS del usuario: no
  • Accesibilidad: no
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  • Moderator
10783 soluciones 97065 respuestas

That warning page is meant as humor because Firefox doesn't come with a warranty to make you aware to be cautious with changing prefs. You can accept this and proceed to the actual about:config page.

Did you try to close Firefox (Firefox > Quit) with at least one window open?