Can't log on through Mozilla

I can't log on to this forum through Mozilla.  I don't have a problem with logging on through IE.  Please help! awl3|k/  
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Every time I tried through Mozilla, after entering user name/password, the webpage refreshed, but my username was not displayed at the upper left corner.  I tried to reply to post, and received the message that I was not log on.

清理cookie 和 cash，然后再进网页登陆。