Coming from Personas Plus this is a terrible experience. Adding an image to the background does not show it correctly so you can't see the true end result. and the adjustment icons don't work. Should be able to drag it.

Worse, since you can't see how it really looks until you get it signed, there is no way to try it without going though the rigamaroll which is way too complicated for someone who just wants a custom theme for themselves.

This should all be done locally with the ability to do it offline, then FF Color should be able to create a usable .xpi without signing or submitting if its only for that computer's use. It should be able to be flagged for non-distribution which would prevent it from going anywhere but the computer it was created on.

In that case one could create their own themes and try them out easily and quickly, without any of this ridiculous involved signing and submitting going on! For a THEME? REALLY?

Security should not come at the cost of common sense and private freedom to customize the look of your browser. It's not a threat to change colors and add a private photo as your background image.

PLEASE make this easier for people who are NOT interested in publishing!