Default applications and volume icon

[Ted To]

Hi,

I installed beta 2 a few weeks ago (via dist-upgrading since grub2 
seemed to be broken) and everything looks beautiful.  One problem I'm 
having is that although chromium is the default application (both with 
xfce's settings manager and x-www-browser and gnome-www-browser) but 
whenever I click on a link in either gwibber or thunderbird, it opens 
firefox.

The other problem may be an ubuntu problem in general but the mouse 
wheel while hovering over the volume icon no longer changes the volume.

Thanks,
Ted To