File name: NPSWF32.dll
Shockwave Flash 10.0 r32

Got this plugin installed which I think is needed but can't see anything?

Just for info here's what about:plugins reports
------------------------------------------------------------------------

Installed plug-ins
Find more information about browser plug-ins at mozilla.org.
Help for installing plug-ins is available from plugindoc.mozdev.org.
RealJukebox NS Plugin

File name: nprjplug.dll
RealJukebox Netscape Plugin

MIME Type Description Suffixes Enabled
none RealJukebox NS Plugin File none Yes
RealPlayer(tm) G2 LiveConnect-Enabled Plug-In (32-bit)

File name: nppl3260.dll
RealPlayer(tm) LiveConnect-Enabled Plug-In

MIME Type Description Suffixes Enabled
audio/x-pn-realaudio-plugin RealPlayer(tm) as Plug-in rpm Yes
RealPlayer Version Plugin

File name: nprpjplug.dll
6.0.12.69

MIME Type Description Suffixes Enabled
application/vnd.rn-realplayer-javascript RealPlayer Version Plugin rpj Yes
Microsoft® Windows Media Player Firefox Plugin

File name: np-mswmp.dll
np-mswmp

MIME Type Description Suffixes Enabled
application/x-ms-wmp np-mswmp * Yes
application/asx * Yes
video/x-ms-asf-plugin * Yes
application/x-mplayer2 * Yes
video/x-ms-asf asf,asx,* Yes
video/x-ms-wm wm,* Yes
audio/x-ms-wma wma,* Yes
audio/x-ms-wax wax,* Yes
video/x-ms-wmv wmv,* Yes
video/x-ms-wvx wvx,* Yes
Mozilla Default Plug-in

File name: npnul32.dll
Default Plug-in

MIME Type Description Suffixes Enabled
* Mozilla Default Plug-in * Yes
Shockwave Flash

File name: NPSWF32.dll
Shockwave Flash 10.0 r32

MIME Type Description Suffixes Enabled
application/x-shockwave-flash Adobe Flash movie swf Yes
application/futuresplash FutureSplash movie spl Yes
Yahoo Application State Plugin

File name: npYState.dll
Yahoo Application State Plugin version 1.0.0.7

MIME Type Description Suffixes Enabled
application/x-vnd.yahoo.applicationState npYState npYState Yes
Windows Presentation Foundation

File name: NPWPF.dll
Windows Presentation Foundation (WPF) plug-in for Mozilla browsers

MIME Type Description Suffixes Enabled
application/x-ms-xbap XAML Browser Application xbap Yes
application/xaml+xml XAML Document xaml Yes
Google Updater

File name: npCIDetect13.dll
Google Updater plugin
http://pack.google.com/

MIME Type Description Suffixes Enabled
application/x-vnd.google.cominstctrl.13 rts Yes
Google Update

File name: npGoogleOneClick8.dll
Google Update

MIME Type Description Suffixes Enabled
application/x-vnd.google.oneclickctrl.8 Yes
Java(TM) Platform SE 6 U5

File name: npjava11.dll
Java Plug-in 1.6.0_05 for Netscape Navigator (DLL Helper)

MIME Type Description Suffixes Enabled
application/x-java-applet;version=1.1.1 Java Applet Yes
application/x-java-bean;version=1.1.1 JavaBeans Yes
application/x-java-applet;version=1.1 Java Applet Yes
application/x-java-bean;version=1.1 JavaBeans Yes
application/x-java-applet Java Applet Yes
application/x-java-bean JavaBeans Yes
Java(TM) Platform SE 6 U5

File name: npjava12.dll
Java Plug-in 1.6.0_05 for Netscape Navigator (DLL Helper)

MIME Type Description Suffixes Enabled
application/x-java-applet;version=1.2 Java Applet Yes
application/x-java-bean;version=1.2 JavaBeans Yes
application/x-java-applet;version=1.1.3 Java Applet Yes
application/x-java-bean;version=1.1.3 JavaBeans Yes
application/x-java-applet;version=1.1.2 Java Applet Yes
application/x-java-bean;version=1.1.2 JavaBeans Yes
Java(TM) Platform SE 6 U5

File name: npjava13.dll
Java Plug-in 1.6.0_05 for Netscape Navigator (DLL Helper)

MIME Type Description Suffixes Enabled
application/x-java-applet;version=1.3.1 Java Applet Yes
application/x-java-bean;version=1.3.1 JavaBeans Yes
application/x-java-applet;version=1.4 Java Applet Yes
application/x-java-bean;version=1.4 JavaBeans Yes
application/x-java-applet;version=1.4.1 Java Applet Yes
application/x-java-bean;version=1.4.1 JavaBeans Yes
Java(TM) Platform SE 6 U5

File name: npjava14.dll
Java Plug-in 1.6.0_05 for Netscape Navigator (DLL Helper)

MIME Type Description Suffixes Enabled
application/x-java-applet;version=1.4.2 Java Applet Yes
application/x-java-bean;version=1.4.2 JavaBeans Yes
application/x-java-applet;version=1.5 Java Applet Yes
application/x-java-bean;version=1.5 JavaBeans Yes
application/x-java-applet;version=1.6 Yes
application/x-java-bean;version=1.6 Yes
Java(TM) Platform SE 6 U5

File name: npjava32.dll
Java Plug-in 1.6.0_05 for Netscape Navigator (DLL Helper)

MIME Type Description Suffixes Enabled
application/x-java-applet;version=1.3 Java Applet Yes
application/x-java-bean;version=1.3 JavaBeans Yes
application/x-java-applet;version=1.2.2 Java Applet Yes
application/x-java-bean;version=1.2.2 JavaBeans Yes
application/x-java-applet;version=1.2.1 Java Applet Yes
application/x-java-bean;version=1.2.1 JavaBeans Yes
Java(TM) Platform SE 6 U5

File name: npoji610.dll
Java Plug-in 1.6.0_05 for Netscape Navigator (DLL Helper)

MIME Type Description Suffixes Enabled
application/x-java-vm Java Yes
Java(TM) Platform SE 6 U5

File name: npjpi160_05.dll
Java Plug-in 1.6.0_05 for Netscape Navigator (DLL Helper)

MIME Type Description Suffixes Enabled
application/x-java-applet;jpi-version=1.6.0_05 Java Applet Yes
application/x-java-bean;jpi-version=1.6.0_05 JavaBeans Yes
Adobe Acrobat

File name: nppdf32.dll
Adobe PDF Plug-In For Firefox and Netscape

MIME Type Description Suffixes Enabled
application/pdf Acrobat Portable Document Format pdf Yes
application/vnd.adobe.x-mars Acrobat Portable XML Document Format mars Yes
application/vnd.fdf Acrobat Forms Data Format fdf Yes
application/vnd.adobe.xfdf XML Version of Acrobat Forms Data Format xfdf Yes
application/vnd.adobe.xdp+xml Acrobat XML Data Package xdp Yes
application/vnd.adobe.xfd+xml Adobe FormFlow99 Data File xfd Yes

Isn't a plugin or browser problem, is a web design error, look the source code:

<frameset>
<frame src ="http://www.gadget-detective.moonfruit.com" />
</frameset>

This not work in Gecko browsers, only in IE because IE considered this like a redirection.

Load this url to access the website:
http://www.gadget-detective.moonfruit.com

K-Meleon in Spanish