That sequence was merely an example of something that is monotonic and bounded, it wasn't chosen to be a model for memory usage or performance or anything like

That sequence was merely an example of something that is monotonic and bounded, it wasn't chosen to be a model for memory usage or performance or anything like that. Also, I don't see Mozilla claiming memory usage follows a curve like 1/x. In fact, I don't seem them claiming anything about long term memory usage other than "it's decreasing", which is true, and can be true without implying that the memory usage will eventually be 0. (Btw, I don't think Mozilla have ever said something as frivolous as "1/1024 faster".)