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This add-on omits what should be the most basic feature of an email image viewer: the ability to view, as complete pictures, the images attached to an email in a window that can be toggled between full-screen and a pop-up window, with the ability to move between pictures with the arrow keys.

Why is that so hard? There doesn't seem to be any way to make it do that.

All this program's "Full-screen" option does is make Thunderbird go full screen, not the picture, which still has to be scrolled within the small message review area.