Internet Explorer(tm) saves your location in a document when you follow a link, and when you hit the back button returns you to the same position; I'd like to see that feature in Mozilla some day as well. This seems to be the only thing from Internet Explorer(tm) that I miss. Note: this is probably a duplicate, but I couldn't seem to find an earlier request.
This feature has been in for a while. What version/Build ID of Mozilla are you using? Please make sure to include that with all bug reports. Nightly builds are available at http://www.mozilla.org
I was using an older build, I updated to 20020826 and it was present there.