It depends on the game and what problem you are having, but a general fix is to clear your cache and cookies. See Fix problems with Facebook games, chat and more

Thanks! That was actually one of the first things I did. And I do that pretty regularly anyway. It didn't fix the problem. About half the games that I play won't even open. They act like they are going to then just sit there until I close the page. A few games will play though.

This seems to be the only problem I have with Firefox. So I don't think it's a big deal to open either IE or Google Chrome to play a few games with. But it is still a problem that Firefox is not working completely as it should and I'd like to find a fix for this. I'd like to say good bye to IE forever if possible.

We'll need some more info about your Firefox setup. Go to Help > Troubleshooting Information, then click Copy all to Clipboard. Open a reply to this post, and go to Edit > Paste to paste the info from your Troubleshooting Information page. [edit]

Is this what you mean?

 Application Basics

       Name
       Firefox

       Version
       3.6.3

       Profile Directory

         Open Containing Folder

       Installed Plugins

         about:plugins

       Build Configuration

         about:buildconfig

 Extensions

       Name

       Version

       Enabled

       ID

       Norton IPS
       2.0
       true
        

       Microsoft .NET Framework Assistant
       1.2.1
       true
       {20a82645-c095-46ed-80e3-08825760534b}

       BetterPrivacy
       1.47.4
       true
        

       Adblock Plus
       1.2
       true
        

       Download Statusbar
       0.9.6.8
       true
        

       Google Shortcuts
       2.0.5
       true
       {5C46D283-ABDE-4dce-B83C-08881401921C}

       FastestFox
       4.1.3
       true
       smarterwiki@wikiatic.com

       Update Notifier
       0.1.5.5
       true
       {95f24680-9e31-11da-a746-0800200c9a66}

       Boost for Facebook
       9.9.2
       true
       {47624dda-b77e-4feb-820a-e4f077d5d4ca}

       Personal Menu
       4.3.2
       true
       CompactMenuCE@Merci.chao

       QuickNote
       0.6.0.5
       true
        

       TinyUrl Creator
       1.0.5
       true
       {89736E8E-4B14-4042-8C75-AD00B6BD3900}

       JavaScript Debugger
       0.9.87.4
       true
        

       BetterSearch
       2.0
       true
       {2bfc8624-5b8a-4060-b86a-e78ccbc38509}

       Dict
       0.6.78
       true
        

       InfoLister
       0.10.3
       true
       {3f0da09b-c1ab-40c5-8d7f-53f475ac3fe8}

       Wikipedia Lookup Add-on
       0.3.8
       true
       {246B0AC1-31AB-4786-A4CC-A6AF89647D7F}

       ReminderFox
       1.9.8.1
       true
        

       Gmail Notifier
       0.6.4.1
       true
       {44d0a1b4-9c90-4f86-ac92-8680b5d6549e}

       SmoothWheel (AMO)
       0.45.6.20100202.1
       true
       {5F590AA2-1221-4113-A6F4-A4BB62414FAC}

       Yoono
       7.1.6
       true
        

       Morning Coffee
       1.33
       true
       morningCoffee@shaneliesegang

       Wordpress.com Sidebar
       1.9
       true
       {6b1aaf8e-bd72-4574-ab0a-55b4af70426f}

       Personas
       1.5.3
       true
       personas@christopher.beard

       FaceMod Dislike Button
       1.1.5
       true
       {64e8cc5b-20db-4212-8320-178fc5ae71f7}

       FEBE
       6.3.3
       true
       {4BBDD651-70CF-4821-84F8-2B918CF89CA3}

       UnPlug
       2.025
       true
       unplug@compunach

       Autofill Forms
       0.9.5.2
       true
       autofillForms@blueimp.net

       ReloadEvery
       3.6.3
       true
       {888d99e7-e8b5-46a3-851e-1ec45da1e644}

       Screengrab
       0.96.3
       true
       {02450954-cdd9-410f-b1da-db804e18c671}

       MeasureIt
       0.4
       true
       {75CEEE46-9B64-46f8-94BF-54012DE155F0}

       Web2PDF converter
       1.8
       true
        

       Google Reader Watcher
       1.1
       true
       grwatcher@ajnasz.hu

       Better GReader
       0.8.3
       true
       bettergreader@ginatrapani.org

       Firefox Throttle
       1.1.6
       true
        

       add.2.cal
       2010021708
       true
       add2cal-addon@blackdrumm.com

       WOT
       20100503
       true
        

 Modified Preferences

     Name

     Value

       browser.history_expire_days.mirror
       180

       browser.places.smartBookmarksVersion
       2

       browser.startup.homepage
       http://www.google.com/ig/dell

       browser.startup.homepage_override.mstone
       rv:1.9.2.3

       extensions.lastAppVersion
       3.6.3

       general.useragent.extra.microsoftdotnet
       ( .NET CLR 3.5.30729)

       network.cookie.prefsMigrated
       true

       network.http.proxy.version
       1.0

       places.last_vacuum
       1273703416

       privacy.clearOnShutdown.cookies
       false

       privacy.clearOnShutdown.downloads
       false

       privacy.clearOnShutdown.formdata
       false

       privacy.clearOnShutdown.history
       false

       privacy.clearOnShutdown.sessions
       false

       privacy.sanitize.migrateFx3Prefs
       true

       privacy.sanitize.sanitizeOnShutdown
       true

       security.warn_viewing_mixed
       false

You have quite a bit of add-ons, and I think that maybe one of them is getting in the way. Maybe adblock is blocking the games?

If the problem does not occur in Safe Mode, then you can disable your extensions one-by-one until you find out which one is causing the problem. See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems