From what I read about Greasemonkey (from your Wikipedia link) this fits in its development paradigm. However Greasemonkey support/development appears to have been stopped. I am beginning to read about Kango a cross-browser extension framework that works with Chrome/IE/Firefox/Opera/Safari to accomplish the same thing. Since all of this is basically Javascript Document Object Model programming it might be doable with just plain Javascript but I will continue to look in my spare (??) time. Most of the time these frameworks exist just to make the scripting easier than just writing plain Javascript.
I am assuming we would be doing this so we would not have to go back to links and change them? I have no idea how the Archive software works, could the TOC be database driven? I have no frame of reference as to how difficult changing the links would be.
I will do more investigation into the Kango framework and see what it might be able to do for us.
Mike