This only happens in FF, not in Chrome or Safari. Basically when I go to certain URLs in history for my website, ie: mysite.com/page.html, the browser adds text to the URL in this pattern: www.mysitemysite.com/page.html So it doubles up on the domain name, and of course gives me an error that it cannot find that webpage. However, this only happens with certain history items. It does not happen with all pages for my domain. Further, if I specify the www part of the URL as in www.mysite.com/page.html, it resolves fine and does not add any text. This may be a bug. I'm going to try clearing my history to see if maybe the history file may have been corrupted on certain entries and we'll see if that fixes it.