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After updating IE7, Firefox 3.6 no longer store history--back button in Firefox can't access previous pages.

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Yesterday a security update for IE7 was automatically downloaded into my computer. Now the history feature of Firefox is working poorly. Often it doesn't save previous pages for the back button to access during an online session. The few times I've been able to navigate back to a Google search page, the search terms I've used previously are absent. However most often today, the browser doesn't even acknowledge that there were previous pages and the back button remains grayed out.

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Basic troubleshooting info:

 Application Basics
        Name         Firefox
        Version         3.6.8
        Profile Directory
          Open Containing Folder
        Installed Plugins
          about:plugins
        Build Configuration
          about:buildconfig
  Extensions
        Name
        Version
        Enabled
        ID
        Advertising Cookie Opt-out         1.2         true         optout@google.com
        Microsoft .NET Framework Assistant         0.0.0         false         {20a82645-c095-46ed-80e3-08825760534b}
        Java Console         6.0.20         true          
        Java Quick Starter         1.0         true         jqs@sun.com
  Modified Preferences
      Name
      Value
        accessibility.typeaheadfind.flashBar         0
        browser.history_expire_days.mirror         180
        browser.history_expire_days_min         4
        browser.places.smartBookmarksVersion         2
        browser.startup.homepage         https://encrypted.google.com/
        browser.startup.homepage_override.mstone         rv:1.9.2.8
        browser.tabs.warnOnClose         false
        browser.zoom.full         false
        dom.max_chrome_script_run_time         0
        extensions.lastAppVersion         3.6.8
        network.cookie.prefsMigrated         true
        places.last_vacuum         1275620219
        print.print_printer         HP Deskjet D2500 series
        print.printer_HP_Deskjet_D2500_series.print_bgcolor         false
        print.printer_HP_Deskjet_D2500_series.print_bgimages         false
        print.printer_HP_Deskjet_D2500_series.print_command
        print.printer_HP_Deskjet_D2500_series.print_downloadfonts         false
        print.printer_HP_Deskjet_D2500_series.print_edge_bottom         0
        print.printer_HP_Deskjet_D2500_series.print_edge_left         0
        print.printer_HP_Deskjet_D2500_series.print_edge_right         0
        print.printer_HP_Deskjet_D2500_series.print_edge_top         0
        print.printer_HP_Deskjet_D2500_series.print_evenpages         true
        print.printer_HP_Deskjet_D2500_series.print_footercenter
        print.printer_HP_Deskjet_D2500_series.print_footerleft         &PT
        print.printer_HP_Deskjet_D2500_series.print_footerright
        print.printer_HP_Deskjet_D2500_series.print_headercenter
        print.printer_HP_Deskjet_D2500_series.print_headerleft
        print.printer_HP_Deskjet_D2500_series.print_headerright
        print.printer_HP_Deskjet_D2500_series.print_in_color         true
        print.printer_HP_Deskjet_D2500_series.print_margin_bottom         0.300000011920929
        print.printer_HP_Deskjet_D2500_series.print_margin_left         0.5
        print.printer_HP_Deskjet_D2500_series.print_margin_right         0.5
        print.printer_HP_Deskjet_D2500_series.print_margin_top         0.300000011920929
        print.printer_HP_Deskjet_D2500_series.print_oddpages         true
        print.printer_HP_Deskjet_D2500_series.print_orientation         0
        print.printer_HP_Deskjet_D2500_series.print_pagedelay         500
        print.printer_HP_Deskjet_D2500_series.print_paper_data         1
        print.printer_HP_Deskjet_D2500_series.print_paper_height         11.00
        print.printer_HP_Deskjet_D2500_series.print_paper_size_type         0
        print.printer_HP_Deskjet_D2500_series.print_paper_size_unit         0
        print.printer_HP_Deskjet_D2500_series.print_paper_width         8.50
        print.printer_HP_Deskjet_D2500_series.print_reversed         false
        print.printer_HP_Deskjet_D2500_series.print_scaling         0.70
        print.printer_HP_Deskjet_D2500_series.print_shrink_to_fit         true
        print.printer_HP_Deskjet_D2500_series.print_to_file         false
        print.printer_HP_Deskjet_D2500_series.print_unwriteable_margin_bottom         0
        print.printer_HP_Deskjet_D2500_series.print_unwriteable_margin_left         0
        print.printer_HP_Deskjet_D2500_series.print_unwriteable_margin_right         0
        print.printer_HP_Deskjet_D2500_series.print_unwriteable_margin_top         0
        privacy.clearOnShutdown.passwords         true
        privacy.clearOnShutdown.siteSettings         true
        privacy.popups.showBrowserMessage         false
        privacy.sanitize.migrateFx3Prefs         true
        privacy.sanitize.sanitizeOnShutdown         true
        privacy.sanitize.timeSpan         0
        security.warn_viewing_mixed         false
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I got an email saying that Cor-el had posted a reply to my question. I don't see it on this page. Was it deleted?