History and settings are deleted sometimes without my knowledge. For instance, IDs and passwords on Gmail and other portals, Google search settings (e.g., major language, number of search results), and many other portals that used to keep my search list of stocks on a stock investing information are gone. Every time of such a problem, I have to search all the items to make them show up on each website or reset the settings. This occurs every 4-5 day since I upgraded my FF to 4.0.