Fire Fox Keeps log me out instantly

Question

I have FireFox5 in my system. When ever I tried to open https://bancobig.cfdonlinetrader.com website, FireFox Instantly logged me out. It is happening in firefox only..For other explorers I am able to login successfully but in FireFox Whenever I tried It keeeps me logged in only for 5 second after that automatically It looged me out..Please help me ..It really important for me.

Answer 1

-> Tap '''ALT''' key or press '''F10''' to show the Menu Bar
-> go to Tools Menu -> Clear Recent History -> '''Time range to clear: select "EVERYTHING"''' -> click Details (small arrow) button -> place Checkmarks on '''Cookies, Cache, Active Logins, Site Preferences''' -> click '''Clear Now'''
-> go to Tools Menu -> Options -> Privacy -> History section -> '''Firefox will: select "Remember History"'''
-> go to Tools Menu -> Options -> Security -> place Checkmarks on:
1) Warn me when sites try to install add-ons 2) Block reported attack sites 3) Block reported web forgeries 4) Remember Passwords for sites
-> go to Tools Menu -> Options -> Advanced -> General -> Accessibility section -> Remove Checkmark from '''Warn me when websites try to redirect or reload the page'''
-> go to Tools Menu -> Options -> Advanced -> Network -> Offline Storage (Cache): click '''Clear Now''' button
-> Click OK on Options window -> Restart Firefox
Check and tell if its working.