Since I downloaded 4.0, FF has been very slow to respond to pretty much any request. It crashes quite often, and now after uninstalling it, and reloading it, I cannot even get it to start. sure could use some good advice.

I had been using 3.something without any problems. After I downloaded 4.0 my troubles started. I would be reading the news in Yahoo and would click on the next page or news item and would get the message ' Oops, well this is embarassing'. Or when I would be looking for something, it would just lock up. When it would finally get to where I wanted to be, it was taking longer and longer to respond. Today, I can't even get it to open at all. Nothing else was altered or added or deleted that might affect FF.
Hope this helps.
My computer skill is low.

That is a problem with an AVG extension (Tools > Add-ons > Extensions)
See:
* [[Troubleshooting extensions and themes]]

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              4 GB RAM
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                        Macintosh HD (disk0s2) /: 319,21 GB (132,44 GB free)
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              Apple Inc. BRCM2046 Hub
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    Thunderbolt Information:
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              [loaded] com.adobe.fpsaud.plist
              [loaded] com.google.keystone.daemon.plist
              [loaded] com.microsoft.office.licensing.helper.plist
              [loaded] com.rim.BBDaemon.plist
              [failed] com.trusteer.rooks.rooksd.plist
              [loaded] com.zeobit.MacKeeper.AntiVirus.plist
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              [loaded] com.divx.dms.agent.plist
              [loaded] com.divx.update.agent.plist
              [loaded] com.google.keystone.agent.plist
              [loaded] com.hp.help.tocgenerator.plist
              [loaded] com.rim.BBLaunchAgent.plist
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              [failed] com.apple.CSConfigDotMacCert-[redacted]@me.com-SharedServices.Agent.plist
              [failed] com.facebook.videochat.[redacted].plist
              [loaded] com.microsoft.LaunchAgent.SyncServicesAgent.plist
              [loaded] com.zeobit.MacKeeper.Helper.plist
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              iTunesHelper
              Microsoft Database Daemon
              TomTomHOMERunner
    3rd Party Preference Panes:
              Flash Player
              Java
              MacFUSE
              Perian
    Internet Plug-ins:
              Default Browser.plugin
              DivX Web Player.plugin
              Flash Player.plugin
              FlashPlayer-10.6.plugin
              Flip4Mac WMV Plugin.plugin
              iPhotoPhotocast.plugin
              JavaAppletPlugin.plugin
              OfficeLiveBrowserPlugin.plugin
              OVSHelper.plugin
              QuickTime Plugin.plugin
              SharePointBrowserPlugin.plugin
              Silverlight.plugin
    User Internet Plug-ins:
              WebEx64.plugin
    Bad Fonts:
              None
    Time Machine:
              Skip System Files: NO
              Mobile backups: ON
              Auto backup: YES
              Volumes being backed up:
                        Macintosh HD: Disk size: 319,21 GB Disk used: 186,77 GB
              Destinations:
                        Time Machine - Backup [Local] (Last used)
                        Total size: 490,11 GB
                        Total number of backups: 9
                        Oldest backup: 2013-09-23 11:46:42 +0000
                        Last backup: 2013-11-18 11:02:42 +0000
                        Size of backup disk: Too small
                                  Backup size 490,11 GB < (Disk used 186,77 GB X 3)
              Time Machine details may not be accurate.
              All volumes being backed up may not be listed.
    Top Processes by CPU:
                   4%          WindowServer
                   2%          EtreCheck
                   2%          Mail
                   0%          sysmond
                   0%          BBLaunchAgent
                   0%          ocspd
                   0%          Dock
                   0%          fontd
                   0%          Activity Monitor
                   0%          opendirectoryd
    Top Processes by Memory:
              205 MB             AntiVirus
              160 MB             Mail
              131 MB             com.apple.IconServicesAgent
              127 MB             MacKeeper Helper
              123 MB             mds_stores
              98 MB              Finder
              98 MB              Dock
              66 MB              Google Chrome
              57 MB              WindowServer
              49 MB              com.apple.WebKit.WebContent
    Virtual Memory Statistics:
              1.04 GB            Free RAM
              1.66 GB            Active RAM
              632 MB             Inactive RAM
              448 MB             Wired RAM
              471 MB             Page-ins
              0 B                Page-outs
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    If you enabled FileVault when you upgraded, it will take a few hours for the conversion process to finish, and during that time performance will be reduced. Otherwise see below.
    Launch the Console application in any of the following ways:
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    The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
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    Some private information, such as your name, may appear in the log. Anonymize before posting.

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