ubuntu starts non-default browser

[stop]

Binary package hint: gconf

The system starts the non-default browser at times. I have firefox and chromium installed. Firefox is set as default browser. Any time the system directs to a website chromium starts up. Examples:
ubuntu-bug start up chromium
The link in the gedit about box
The help--> virtualbox website menu item in virtualbox
About GNOME in the about gnome window
etc..

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: gconf2 2.31.91-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-21.31-generic 2.6.35.4
Uname: Linux 2.6.35-21-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Wed Sep 15 03:57:43 2010
EcryptfsInUse: Yes
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: gconf