why do i can't sign into twitter on firefox?

[N]

i can log in via IE, but not firefox. I had this problem a few months ago as well and I searched on google and i found a simple remedy to change something in the setting and it worked, however now i can't remember what i did, and i can't find the article which helped me either.
does anyone know what should i do?

ps in the privacy the accept third party cookies is checked, also the option above it yet it does not log into twitter.
thanks

[Jomari]

Try other browser.

[ЅƬΘΓΜUΓΓ]

Clear the Cookies from Firefox:
http://support.mozilla.com/en-US/kb/Clea...ate%20data

Or use CCleaner (slim):
http://www.piriform.com/ccleaner/download/slim

Then try logging in.