First, it's not using a lot of memory. That's the result of using the library system. You're likely using 'externals' or embedded libraries, which result in addons (from the UI's point of view) appearing to take the weight of the libraries, as far as memory goes. What does this mean? The info for several other addons are showing up under FuBar incorrectly. No biggie. Has no affect on anything.
Second, don't worry. With 1 gig of RAM you can rock out a UI that's 1/3+ the memory of the base game and you won't really see issues. You can imagine here that a couple megabytes isn't going to matter, at all. Even if you were running 512 megabytes, you wouldn't have any reason to worry.
Best bet is to turn off memory display. It doesn't matter. Stop worrying about it.