Do App Tabs use a lot of memory?

I like the concept of App Tabs, but with my browsing habits I don't know how many I'll be able to use without experiencing a computer slowdown. How much memory do tabs take up? And how does Firefox handle them?

I can't imagine that states themselves take up much memory at all; they seem to be shortcuts for arrays of properties (visible, alpha, etc) for objects that would exist in some form or another anyway. Of course, if you have a 10GB component in one state, it would be the object itself that takes up the memory. Just a guess.

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