Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

Restore previous session and Recently closed Windows are grayed out; I cannot restore


Restore previous session and Recenly closed windwos under History are grayed out. Files sessionstore.js and sessionstore.bak cannot be found when I run Search for them. The last winodw that appeared after the crash and tried to restore had this information:

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

But there was no list of tabs in this window and the button Restore was grayed out and there was not an option to start a new session only button Close. I hit Close.

Just before that crash I had two windows with multiple tabs opened. How can I restore those sessions? Wher can I find the information about them?

Post a Reply

Additional System Details

Installed Plug-ins

  • Google Update
  • Shockwave Flash 11.9 r900
  • Adobe Shockwave for Director Netscape plug-in, version
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.8
  • 5.1.20513.0
  • VLC media player Web Plugin 2.0.6
  • Next Generation Java Plug-in 10.15.2 for Mozilla browsers
  • 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.
  • Foxit Reader Plug-In For Firefox and Netscape
  • Google Talk Plugin Video Accelerator version:
  • Version
  • RealJukebox Netscape Plugin
  • RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In
  • RealPlayer(tm) HTML5VideoShim Plug-In
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • RealPlayer Download Plugin
  • Intel web components updater - Installs and updates the Intel web components
  • Intel web components for Intel® Identity Protection Technology
  • The plug-in allows you to open and edit files using Microsoft Office applications
  • Office Authorization plug-in for NPAPI browsers


  • Firefox 24.0
  • User Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Firefox/24.0
  • Support URL: https://support.mozilla.org/1/firefox/24.0/WINNT/en-US/


  • Adblock Plus 2.2.1 ({d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d})
  • DownloadHelper 4.9.12 ({b9db16a4-6edc-47ec-a1f4-b86292ed211d})
  • IE View 1.5.1 ({6e84150a-d526-41f1-a480-a67d3fed910d})
  • Session Manager ({1280606b-2510-4fe0-97ef-9b5a22eafe30})
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • Zotero 3.0.8 (zotero@chnm.gmu.edu)
  • DOM Inspector 2.0.13 (inspector@mozilla.org) (Inactive)
  • Foxit PDF Creator Toolbar (toolbar@ask.com) (Inactive)
  • Microsoft .NET Framework Assistant 1.3.1 ({20a82645-c095-46ed-80e3-08825760534b}) (Inactive)
  • RealPlayer Browser Record Plugin 15.0.4 ({97E22097-9A2F-45b1-8DAF-36AD648C7EF4}) (Inactive)
  • Symantec Intrusion Prevention - 1 ({BBDA0591-3099-440a-AA10-41764D9DB4DB}) (Inactive)
  • Web Developer 1.2.2 ({c45c406e-ab73-11d8-be73-000a95be3b12}) (Inactive)
  • Yahoo! Toolbar ({635abd67-4fe9-1b23-4f01-e679fa7484c1}) (Inactive)


  • incrementalGCEnabled: True


  • adapterDescription: Intel(R) HD Graphics 4000
  • adapterDescription2:
  • adapterDeviceID: 0x0166
  • adapterDeviceID2:
  • adapterDrivers: igdumd32 igd10umd32 igd10umd32
  • adapterDrivers2:
  • adapterRAM: Unknown
  • adapterRAM2:
  • adapterVendorID: 0x8086
  • adapterVendorID2:
  • clearTypeParameters: Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 400
  • direct2DEnabled: True
  • directWriteEnabled: True
  • directWriteVersion: 6.1.7601.17789
  • driverDate: 8-21-2012
  • driverDate2:
  • driverVersion:
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'direct2d', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'direct2d'}
  • isGPU2Active: False
  • numAcceleratedWindows: 2
  • numTotalWindows: 2
  • webglRenderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4000 Direct3D9Ex vs_3_0 ps_3_0)
  • windowLayerManagerRemote: False
  • windowLayerManagerType: Direct3D 10

Modified Preferences

  • accessibility.typeaheadfind.flashBar: 0
  • browser.cache.disk.capacity: 358400
  • browser.cache.disk.parent_directory: c:\tempfirefox
  • 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.history_expire_days.mirror: 180
  • 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.search.update: False
  • browser.sessionstore.restore_on_demand: False
  • browser.startup.homepage: http://www.wfu.edu/
  • browser.startup.homepage_override.buildID: 20130910160258
  • browser.startup.homepage_override.mstone: 24.0
  • dom.mozApps.used: True
  • dom.w3c_touch_events.expose: True
  • extensions.lastAppVersion: 24.0
  • font.size.variable.x-western: 22
  • general.useragent.extra.microsoftdotnet: ( .NET CLR 3.5.30729)
  • gfx.direct3d.last_used_feature_level_idx: 0
  • gfx.direct3d.prefer_10_1: True
  • network.cookie.prefsMigrated: True
  • places.database.lastMaintenance: 1383061015
  • places.history.expiration.transient_current_max_pages: 86686
  • places.last_vacuum: 1352622352
  • plugin.disable_full_page_plugin_for_types: application/pdf,application/vnd.fdf,application/vnd.adobe.xfdf,application/vnd.adobe.xdp+xml
  • plugin.importedState: True
  • privacy.cpd.cache: False
  • privacy.cpd.downloads: False
  • privacy.cpd.formdata: False
  • privacy.cpd.history: False
  • privacy.cpd.sessions: False
  • privacy.donottrackheader.enabled: True
  • privacy.sanitize.migrateFx3Prefs: True
  • privacy.sanitize.timeSpan: 0
  • security.warn_viewing_mixed: False
  • storage.vacuum.last.index: 1
  • storage.vacuum.last.places.sqlite: 1381291712


  • User JS: Yes
  • Accessibility: Yes
  • Top 10 Contributor
  • Moderator
10742 solutions 96657 answers

Make sure that you do not run Firefox in (permanent) Private Browsing mode (Never Remember History).

  • Tools > Options > Privacy > Firefox will: "Use custom settings for history"
  • Deselect: [ ] "Always use private browsing mode"

In case you are using "Clear history when Firefox closes":

  • do not clear the Browsing History

Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.

Was this helpful to you? 3

Question owner

Thank you but I checked it; Under Privacy I have Remember history. I checked all the recommendations from the posts you refer to and I have them set correctly in all Tabs under Options

Was this helpful to you? 2
  • Top 10 Contributor
  • Moderator
10742 solutions 96657 answers

You can check the browser.sessionstore.* prefs on the about:config page and reset user set (bold) browser.sessionstore.*prefs to the default value via the right-click context menu to make sure that Session Restore is enabled and working properly.

If you use cleanup software like CCleaner then check the settings for the Firefox application.

Was this helpful to you? 5

Question owner

Thanks but which one, please? I reset browser.sessionstore. restore_on_demand to true? It was the only one bold. But it did not help. Is this the right one? Do I need to restart Firefox now?

Was this helpful to you? 0
  • Top 10 Contributor
  • Moderator
10742 solutions 96657 answers

The browser.sessionstore.restore_on_demand pref is the setting in Options > Tabs: Don’t load tabs until selected.

You can use this button to go to the Firefox profile folder:

  • Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
Was this helpful to you? 2

Question owner

Thank you very much. I entered the Profile but am unsure what to do in there. I do not see browser.session.store. there. I will look at it again tomorrow and will let you know.

Was this helpful to you? 0
  • Top 10 Contributor
  • Moderator
10742 solutions 96657 answers

You won't find browser.session.store in the Firefox profile folder, but you can check if you have any sessionstore files.

You can try to create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

If the new profile works then you can transfer some files from an existing profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem.

Was this helpful to you? 0
IRHF 0 solutions 3 answers

Helpful Reply

I lost too many saved pages and bookmarks because the Restore Previous Sessioin option disappeared from my home page and was grayed out under history. If you're not computer savvy and the complicated suggested fixes are over your head or don't work, save all your Firefox bookmarks to Google Chrome. Delete Firefox and start using Google Chrome. I have never had this problem with Google Chrome.

Was this helpful to you? 5
rlweiner 0 solutions 3 answers

Just happened to me after a system crash. I back up systemstore.js nightly. I retrieved the latest version but it appears to have been corrupted. Fortunately, the previous version worked. Lesson: Back up systemstore.js routinely and use a backup system that keeps multiple versions. Unfortunately, this won't help you get your session back if you haven't been backing up this folder. (On my Win7 system the file is in C:\Users\[username]\AppData\Roaming\Mozilla\Firefox\Profiles\[folder])

Was this helpful to you?
  • Top 10 Contributor
  • Moderator
10742 solutions 96657 answers

If the sessionstore.js file isn't very large then you can try to validate the file online.

Was this helpful to you? 0
Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.