I randomly get black boxes instead of images when loading a webpage

Question

== Issue
==
I have another kind of problem with Firefox
== Description
==
Ever since I upgraded to the newest version of Firefox, I've been getting a lot of blacked out boxes instead of the actual images. When I right click "View Image", the image does show up, but I don't want to keep right clicking boxes just to see an image. I also checked to see if I might how blocked the image on AdBlock or on "Page Info", but nothing was marked.
The blacking out of images seems to happen randomly at different times. From different tabs opened, not all images are blacked out. On the same page, some images will be blacked out while some show up. Also, I've for the same web page, one day I'll open it up and everything is fine, but the next day I open up the same URL and the images are blacked out. It just seems so random.
I was thinking my internet speed could have something to do with it. The blacking out also happens more frequently when I have multiple tabs open or if the images are larger. However, I did not have this problem until I upgraded Firefox.
== This happened
==
A few times a week
== I upgraded to the newest version of Firefox
==
== Troubleshooting information
==
Application Basics
Name Firefox
Version 3.6.6
Profile Directory
Open Containing Folder
Installed Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Adblock Plus 1.2.1 true
AVG Safe Search 9.0.0.825 true {3f963a5b-e555-4543-90e2-c3908898db71}
AVG Security Toolbar 4.002.023.004 false avg@igeared
Delicious Bookmarks 2.1.072 true {2fa4ed95-0317-4c6a-a74c-5f3e3912c1f9}
Dictionary 2.1.10 true [email protected]
FireShot 0.80 false {0b457cAA-602d-484a-8fe7-c1d894a011ba}
FlashGot 1.2.1.27 true {19503e42-ca3c-4c27-b1e2-9cdb2170ee34}
Java Console 6.0.14 true
Java Console 6.0.15 true
Java Console 6.0.17 true
Java Quick Starter 1.0 true [email protected]
Microsoft .NET Framework Assistant 1.2.1 true {20a82645-c095-46ed-80e3-08825760534b}
Read It Later 2.0.6 true [email protected]
SkipScreen 0.4.7amo true SkipScreen@SkipScreen
StumbleUpon 3.64 true
TVU Web Player 2,4,9,1 true [email protected]
FastestFox 4.1.5 true [email protected]
ColorfulTabs 4.6.1 false {0545b830-f0aa-4d7e-8820-50a4629a56fe}
Morning Coffee 1.33 true morningCoffee@shaneliesegang
Java Console 6.0.20 true
Modified Preferences
Name
Value
accessibility.typeaheadfind.flashBar 0
browser.history_expire_days.mirror 180
browser.history_expire_days_min 30
browser.places.importBookmarksHTML false
browser.places.importDefaults false
browser.places.leftPaneFolderId -1
browser.places.migratePostDataAnnotations false
browser.places.smartBookmarksVersion 2
browser.places.updateRecentTagsUri false
browser.startup.homepage www.yahoo.com
browser.startup.homepage_override.mstone rv:1.9.2.6
dom.ipc.plugins.timeoutSecs 10
extensions.lastAppVersion 3.6.6
general.useragent.extra.microsoftdotnet ( .NET CLR 3.5.30729)
javascript.options.showInConsole true
keyword.URL http://us.yhs.search.yahoo.com/avg/search?fr=yhs-avg&type=yahoo_avg_hs2-tb-web_us&p=
network.cookie.prefsMigrated true
network.http.sendRefererHeader 0
places.last_vacuum 1278934795
print.print_printer Microsoft XPS Document Writer
print.printer_Microsoft_XPS_Document_Writer.print_bgcolor false
print.printer_Microsoft_XPS_Document_Writer.print_bgimages false
print.printer_Microsoft_XPS_Document_Writer.print_command
print.printer_Microsoft_XPS_Document_Writer.print_downloadfonts false
print.printer_Microsoft_XPS_Document_Writer.print_edge_bottom 0
print.printer_Microsoft_XPS_Document_Writer.print_edge_left 0
print.printer_Microsoft_XPS_Document_Writer.print_edge_right 0
print.printer_Microsoft_XPS_Document_Writer.print_edge_top 0
print.printer_Microsoft_XPS_Document_Writer.print_evenpages true
print.printer_Microsoft_XPS_Document_Writer.print_footercenter
print.printer_Microsoft_XPS_Document_Writer.print_footerleft &PT
print.printer_Microsoft_XPS_Document_Writer.print_footerright &D
print.printer_Microsoft_XPS_Document_Writer.print_headercenter
print.printer_Microsoft_XPS_Document_Writer.print_headerleft &T
print.printer_Microsoft_XPS_Document_Writer.print_headerright &U
print.printer_Microsoft_XPS_Document_Writer.print_in_color true
print.printer_Microsoft_XPS_Document_Writer.print_margin_bottom 0.5
print.printer_Microsoft_XPS_Document_Writer.print_margin_left 0.5
print.printer_Microsoft_XPS_Document_Writer.print_margin_right 0.5
print.printer_Microsoft_XPS_Document_Writer.print_margin_top 0.5
print.printer_Microsoft_XPS_Document_Writer.print_oddpages true
print.printer_Microsoft_XPS_Document_Writer.print_orientation 0
print.printer_Microsoft_XPS_Document_Writer.print_pagedelay 500
print.printer_Microsoft_XPS_Document_Writer.print_paper_data 1
print.printer_Microsoft_XPS_Document_Writer.print_paper_height 11.00
print.printer_Microsoft_XPS_Document_Writer.print_paper_size_type 0
print.printer_Microsoft_XPS_Document_Writer.print_paper_size_unit 0
print.printer_Microsoft_XPS_Document_Writer.print_paper_width 8.50
print.printer_Microsoft_XPS_Document_Writer.print_reversed false
print.printer_Microsoft_XPS_Document_Writer.print_scaling 1.00
print.printer_Microsoft_XPS_Document_Writer.print_shrink_to_fit true
print.printer_Microsoft_XPS_Document_Writer.print_to_file false
print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_bottom 0
print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_left 0
print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_right 0
print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_top 0
privacy.clearOnShutdown.cookies false
privacy.clearOnShutdown.formdata false
privacy.clearOnShutdown.history false
privacy.cpd.formdata false
privacy.cpd.sessions false
privacy.cpd.siteSettings true
privacy.item.formdata false
privacy.item.history false
privacy.sanitize.migrateFx3Prefs true
privacy.sanitize.sanitizeOnShutdown true
privacy.sanitize.timeSpan 0
security.warn_viewing_mixed false
security.warn_viewing_mixed.show_once false
== Firefox version
==
3.6.6
== Operating system
==
Windows XP
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6 ( .NET CLR 3.5.30729)
== Plugins installed
==
*-Shockwave Flash 10.1 r53
*2,4,9,1
*6.0.12.69
*RealPlayer(tm) LiveConnect-Enabled Plug-In
*npdivxplayerplugin
*Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
*NPRuntime Script Plug-in Library for Java(TM) Deploy
*Default Plug-in
*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 Shockwave for Director Netscape plug-in, version 11.5
*4.0.50524.0
*Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
*Npdsplay dll
*DRM Store Netscape Plugin
*DRM Netscape Network Object

Answer 1

Do you have that problem when running in the Firefox SafeMode?
[http://support.mozilla.com/en-US/kb/Safe+Mode]
''Don't select anything right now, just use "Continue in SafeMode."''
If not, see this:
[http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes]