firefox error

hello,

when i try and access nopcommerce from mozilla firefox, doesn't lets me log in.

tried creating new account but on login it keeps on redirecting to the home page

regards

I am having the same error with v1.9.  Also this is happing in new IE 9.  With www.domain.com cannot log in as admin or register new customers.  Remove www and works fine in IE9.  Will not work at all in Firefox 4.0.  Really need resolution to this, very frustrating.

my website: www.uspedicurespa.com, I just upgraded my browser to firefox 4. when I select the language from English to Vietnamese on my homepage, all the pictures are jumping, where the text and pictures are moving into 2 sides. This doesn't happen on Internet Explorer, Chrome or Firefox 3. Anyone know an answer to this, please help me out here.
Thanks