That's called a Favicon - it's specified by the host website to the browser, and cached on your browser's side. You'll note that TFP's is the cascading letters. I imagine you could find it in the cache and replace it with some other image, but it seems like quite a bit of work. I don't know of any way to change it within the UI of Firefox.
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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