Comment 7 for bug 111078

I also have opera running on my computer, it happened several times but only when opera and firefox where open and running at the same time (opera in the background).
the plugins on firefox are: Shockwave Flash

    Bestandsnaam: libflashplayer.so
    Shockwave Flash 9.0 r31

MIME-type Beschrijving Achtervoegsels Actief
application/x-shockwave-flash Shockwave Flash swf Ja
application/futuresplash FutureSplash Player spl Ja
Java(TM) Plug-in 1.6.0-b105

    Bestandsnaam: libjavaplugin_oji.so
    Java(TM) Plug-in 1.6.0

MIME-type Beschrijving Achtervoegsels Actief
application/x-java-vm Java Ja
application/x-java-applet Java Ja
application/x-java-applet;version=1.1 Java Ja
application/x-java-applet;version=1.1.1 Java Ja
application/x-java-applet;version=1.1.2 Java Ja
application/x-java-applet;version=1.1.3 Java Ja
application/x-java-applet;version=1.2 Java Ja
application/x-java-applet;version=1.2.1 Java Ja
application/x-java-applet;version=1.2.2 Java Ja
application/x-java-applet;version=1.3 Java Ja
application/x-java-applet;version=1.3.1 Java Ja
application/x-java-applet;version=1.4 Java Ja
application/x-java-applet;version=1.4.1 Java Ja
application/x-java-applet;version=1.4.2 Java Ja
application/x-java-applet;version=1.5 Java Ja
application/x-java-applet;version=1.6 Java Ja
application/x-java-applet;jpi-version=1.6 Java Ja
application/x-java-bean Java Ja
application/x-java-bean;version=1.1 Java Ja
application/x-java-bean;version=1.1.1 Java Ja
application/x-java-bean;version=1.1.2 Java Ja
application/x-java-bean;version=1.1.3 Java Ja
application/x-java-bean;version=1.2 Java Ja
application/x-java-bean;version=1.2.1 Java Ja
application/x-java-bean;version=1.2.2 Java Ja
application/x-java-bean;version=1.3 Java Ja
application/x-java-bean;version=1.3.1 Java Ja
application/x-java-bean;version=1.4 Java Ja
application/x-java-bean;version=1.4.1 Java Ja
application/x-java-bean;version=1.4.2 Java Ja
application/x-java-bean;version=1.5 Java Ja
application/x-java-bean;version=1.6 Java Ja
application/x-java-bean;jpi-version=1.6 Java Ja
Kaffeine Starter Plugin

    Bestandsnaam: kaffeineplugin.so
    Will start external Kaffeine Media Player for embedded media streams.

MIME-type Beschrijving Achtervoegsels Actief
video/mpeg MPEG animation mpeg, mpg, mpe Ja
video/x-mpeg MPEG animation mpeg, mpg, mpe Ja
audio/mpeg2 MPEG audio mp2 Ja
audio/x-mpeg2 MPEG audio mp2 Ja
audio/mpeg3 MPEG audio mp3 Ja
audio/x-mpeg3 MPEG audio mp3 Ja
audio/mpeg MPEG audio mpa,abs,mpega Ja
audio/x-mpeg MPEG audio mpa,abs,mpega Ja
video/quicktime Quicktime animation mov,qt Ja
video/x-quicktime Quicktime animation mov,qt Ja
video/msvideo AVI animation avi Ja
video/x-msvideo AVI animation avi Ja
application/x-mplayer2 mplayer2 asf,asx,asp Ja
video/x-ms-asf-plugin mms animation asf,asx,asp Ja
audio/x-pn-realaudio-plugin Real audio rpm Ja
audio/x-ogg OGG Media ogg,ogm Ja
audio/x-scpls MPEG audio pls Ja
audio/x-ms-wma Microsoft Media Audio wma Ja
video/x-ms-wmv Microsoft Media Video wmv Ja
audio/x-mpegurl

extentions:
adblock plus 0,7,2,4
amazing media browser 0,22
noscript 1,1,4,6,070317
videodownloader 1,1,1

(the first 2 where not up to date so Iupdated them)