today early morning i started my laptop and opened the firefox and logined to website http://www.bazaartrend.com/nsecharts/login.php and opened java charting module in that website . suddenly laptop restarted itslef and after such restart when i open firefox it will ask if i want to restore firefox tabs but this time it did not ask and i opened the firefox again and opened the same website . this time login username and password of that website are not feeded by firefox . this website username and password were save by me previously and everytime used that website firefox will automatically fill the username password for me . this time it did not happen and i checked the saved logins in SECURITY it shows nothing stored in it . all my saved usernames and passwords are cleared in it . it shows empty . i checked history and bookmarkes and they are intact . only saved logins are empty . couldyou please check why this happened . there is no big problem for me with this . i can restore it back those saved logins my self .