A few days ago I purged shutter ( and with it gnome-web-photo and xulrunner-1.9.2 ), see a former post about installing it.
That removed the ability to show thumbnails of HTML files, which was not my intention....
Xulrunner-1.9.2 is no longer to be found in experimental for my architecture ( amd64 ) so I grabbed both packages from Ubuntu Lucid.
xulrunner-1.9.2 : http://packages.ubuntu.com/lucid/amd64/xulrunner-1.9.2/download
gnome-web-photo : http://packages.ubuntu.com/lucid/gnome-web-photo
Install xulrunner-1.9.2 before installing gnome-web-photo with ( as root ) dpkg -i package
Logout and login. If it did not work start gconf-editor and check at desktop/gnome/thumbnailers/text@html if it is enabled.