"Downloads Complete" dialog box in Firefox 3.0 covers the virtual desktop selector

Description: Ubuntu 8.04.1
Release: 8.04

firefox:
  Installed: 3.0+nobinonly-0ubuntu0.8.04.1
  Candidate: 3.0+nobinonly-0ubuntu0.8.04.1
  Version table:
 *** 3.0+nobinonly-0ubuntu0.8.04.1 0
        500 http://us.archive.ubuntu.com hardy-updates/main Packages
        100 /var/lib/dpkg/status
     3.0~b5+nobinonly-0ubuntu3 0
        500 http://us.archive.ubuntu.com hardy/main Packages
gnome:
  Installed: (none)
  Candidate: 1:2.20.2.2
  Version table:
     1:2.20.2.2 0
        500 http://us.archive.ubuntu.com hardy/universe Packages
xorg:
  Installed: 1:7.3+10ubuntu10
  Candidate: 1:7.3+10ubuntu10
  Version table:
 *** 1:7.3+10ubuntu10 0
        500 http://us.archive.ubuntu.com hardy/main Packages
        100 /var/lib/dpkg/status

Whenever a download completes in Mozilla Firefox 3, a notification slides up the bottom right-hand corner of the screen. This obscures the virtual desktop selector, which is more than a minor nuisance.

I am unsure of whether this should be classified as a Firefox 3.0 issue (should be more selective of where it draws the notification), a GNOME issue (should be more restrictive of where it allows things to be drawn), or an X.org issue (shouldn't allow things to 'cover' layers at the top). That's for someone a bit wiser than me to decide!

A more pleasant behavior would be for the notification to be drawn either from the top of the lower menu bar (if one exists), or to be drawn from the base of the Firefox 3.0 window.