There is but not for YOUR version though I doubt there is such a thing for IE...I don't think you can tweak it like FF.
Once I did this hack at first it worked like a charm, then a little while later my CPU processes were up to 100% , yes that a lot.. a shitload.. Now its back to normal, but it took a while for it to get back... Nice little trick, but use at own risk.
It's working great for me. I havn't had any problems. I couldn't find this "browser.tabs.showSingleWindowModePrefs" either, so I just skipped that step. It still makes my pages load faster.