In theory, having extra windows open would not cost a lot of extra resources. See, the "entire browser interface" is just a little XUL routine inside Firefox that is running whenever a window is refreshed, as part of the repaint routine. So it doesn't cost anything extra, in theory. Only the window structure itself would take up memory space. But not a lot.
In practice, however, your experiments showed differently. I couldn't help but leave a small comment on your blog.
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