I have this problem in IE9 and Firefox 4 still, I run both in Private/InPrivate Mode.
Here is a list of my Firefox 4 Add-ons:
Adblock Plus, WOT, McAfee SiteAdvisor, Add-on Collector, BetterPrivacy, DownloadHelper, Java Console, KeyScrambler, Screengrab.
Here is a list of my Firefox 4 Plug-ins:
Microsoft® Windows Media Player Firefox Plugin
File: np-mswmp.dll
Version: 1.0.0.8
np-mswmp
MIME Type Description Suffixes
application/x-ms-wmp np-mswmp *
application/asx *
video/x-ms-asf-plugin *
application/x-mplayer2 *
video/x-ms-asf asf,asx,*
video/x-ms-wm wm,*
audio/x-ms-wma wma,*
audio/x-ms-wax wax,*
video/x-ms-wmv wmv,*
video/x-ms-wvx wvx,*
Adobe Acrobat
File: nppdf32.dll
Version: 10.0.1.434
Adobe PDF Plug-In For Firefox and Netscape 10.0.1
MIME Type Description Suffixes
application/pdf Acrobat Portable Document Format pdf
application/vnd.adobe.pdfxml Adobe PDF in XML Format pdfxml
application/vnd.adobe.x-mars Adobe PDF in XML Format mars
application/vnd.fdf Acrobat Forms Data Format fdf
application/vnd.adobe.xfdf XML Version of Acrobat Forms Data Format xfdf
application/vnd.adobe.xdp+xml Acrobat XML Data Package xdp
application/vnd.adobe.xfd+xml Adobe FormFlow99 Data File xfd
Java Deployment Toolkit 6.0.240.7
File: npdeployJava1.dll
Version: 6.0.240.7
NPRuntime Script Plug-in Library for Java(TM) Deploy
MIME Type Description Suffixes
application/java-deployment-toolkit
Google Update
File: npGoogleOneClick8.dll
Version: 1.2.183.39
Google Update
MIME Type Description Suffixes
application/x-vnd.google.oneclickctrl.8
Shockwave Flash
File: NPSWF32.dll
Version: 10.2.153.1
Shockwave Flash 10.2 r153
MIME Type Description Suffixes
application/x-shockwave-flash Adobe Flash movie swf
application/futuresplash FutureSplash movie spl
Javaâ„¢ Platform SE 6 U24
File: npjp2.dll
Version: 6.0.240.7
Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
MIME Type Description Suffixes
application/x-java-applet Java Applet
application/x-java-bean JavaBeans
application/x-java-vm
application/x-java-applet;version=1.1.1
application/x-java-bean;version=1.1.1
application/x-java-applet;version=1.1
application/x-java-bean;version=1.1
application/x-java-applet;version=1.2
application/x-java-bean;version=1.2
application/x-java-applet;version=1.1.3
application/x-java-bean;version=1.1.3
application/x-java-applet;version=1.1.2
application/x-java-bean;version=1.1.2
application/x-java-applet;version=1.3
application/x-java-bean;version=1.3
application/x-java-applet;version=1.2.2
application/x-java-bean;version=1.2.2
application/x-java-applet;version=1.2.1
application/x-java-bean;version=1.2.1
application/x-java-applet;version=1.3.1
application/x-java-bean;version=1.3.1
application/x-java-applet;version=1.4
application/x-java-bean;version=1.4
application/x-java-applet;version=1.4.1
application/x-java-bean;version=1.4.1
application/x-java-applet;version=1.4.2
application/x-java-bean;version=1.4.2
application/x-java-applet;version=1.5
application/x-java-bean;version=1.5
application/x-java-applet;version=1.6
application/x-java-bean;version=1.6
application/x-java-applet;jpi-version=1.6.0_24
application/x-java-bean;jpi-version=1.6.0_24
Silverlight Plug-In
File: npctrl.dll
Version: 4.0.60129.0
4.0.60129.0
MIME Type Description Suffixes
application/x-silverlight npctrl scr
application/x-silverlight-2
Windows Live™ Photo Gallery
File: NPWLPG.dll
Version: 15.4.3508.1109
NPWLPG
MIME Type Description Suffixes
application/x-wlpg3-detect Windows Live™ Photo Gallery wlpg
application/x-wlpg-detect Windows Live™ Photo Gallery wlpg
Panda ActiveScan 2.0
File: npwrapper.dll
Version: 1.4.1.0
Panda ActiveScan 2.0 Plugin for Firefox
MIME Type Description Suffixes
application/x-pandasecurity-asinstaller;version=1.9 Panda ActiveScan 2.0 Installer *
application/x-pandasecurity-ascontrol;version=1.9 Panda ActiveScan 2.0 Control *
application/x-pandasecurity-asmain;version=1.9 Panda ActiveScan 2.0 Engine *
VLC Multimedia Plug-in
File: npvlc.dll
Version: 1.1.8.0
Version 1.1.8, copyright 1996-2011 The VideoLAN Team
http://www.videolan.org/
MIME Type Description Suffixes
audio/mpeg MPEG audio mp2,mp3,mpga,mpega
audio/x-mpeg MPEG audio mp2,mp3,mpga,mpega
video/mpeg MPEG video mpg,mpeg,mpe
video/x-mpeg MPEG video mpg,mpeg,mpe
video/mpeg-system MPEG video mpg,mpeg,vob
video/x-mpeg-system MPEG video mpg,mpeg,vob
video/mp4 MPEG-4 video mp4,mpg4
audio/mp4 MPEG-4 audio mp4,mpg4
application/mpeg4-iod MPEG-4 video mp4,mpg4
application/mpeg4-muxcodetable MPEG-4 video mp4,mpg4
video/x-msvideo AVI video avi
video/quicktime QuickTime video mov,qt
application/x-ogg Ogg stream ogg
application/ogg Ogg stream ogg
application/x-vlc-plugin VLC plug-in vlc
video/x-ms-asf-plugin Windows Media video asf,asx
video/x-ms-asf Windows Media video asf,asx
application/x-mplayer2 Windows Media plug-in
video/x-ms-wmv Windows Media video wmv
application/x-google-vlc-plugin Google VLC plug-in
audio/wav WAV audio wav
audio/x-wav WAV audio wav
audio/3gpp 3GPP audio 3gp,3gpp
video/3gpp 3GPP video 3gp,3gpp
audio/3gpp2 3GPP2 audio 3g2,3gpp2
video/3gpp2 3GPP2 video 3g2,3gpp2
video/divx DivX video divx
video/flv FLV video flv
video/x-flv FLV video flv
video/x-matroska Matroska video mkv
audio/x-matroska Matroska audio mka
application/xspf+xml Playlist xspf xspf
audio/x-m4a MPEG-4 audio m4a
audio/x-mpegurl Playlist M3U m3u
audio/x-ms-wma Windows Media Audio wma
Thank you,
-John Jr 