1. Firefox and thunderbird both have GIMP as the default PDF viewer,
which i can manually set to something else that's not in the drop down
list, but i'd like to know if FF/TB get the list and defaults from
Gnome, and if so, where is that configured?
2. When i use a connect a digital camera there no options in the drop
down list. I'm using digikam so i'd like to add it to the list - where
is that configured?