1st session is in process of loading the Suduko app on the washingtonpost.com site, http://games.washingtonpost.com/games/sudoku/ There is a 15 to 30 second window for advertisements. During this window I try to open a 2nd session by right clicking on the Firefox icon on the task bar and clicking on the Mozilla Firefox line. This starts the new session and all that comes up is a blank screen with a blue bar at the top. Nothing happens, no error message, no home page is loaded, nothing. I can exit out of the session that is all. I try again and it does it again. I can finally bring up an active 2nd session once the Washington Post ads are done and the Suduko app is up. This has been going on for several years. I always thought with the next version of Flash Player or Firefox it would be corrected but not so far.