Site adresses are "munged" to show referring page

Currently, if one follows a link from one imdb page to another, the new page's web address gets "munged" to show what page referred it (the "?ref_=img_list_media" suffix of the web address for example). What this means, though, is that if one bookmarks a page by coming at it from one page, but then comes at it from another page, you can't tell you've already visited it. As a result, I'm wasting lots of time revisiting pages I've already seen. Not sure why imdb cares that much which of its *own* pages referred one to another of their pages, but it's a pain. It'd be better if they didn't track these referring pages, so the web address was cleaner.