why can't i log in into my inbox directly when i use firefox

hi how u doin? i hope all u are ok hi. when i use internet explorer as my default browser '''and sign in to live messenger''' i can log directly to my inbox without putting my email and password but when i use firefox and open my inbox from messenger the firefox browser takes me to homepage of hotmail.com and then i must put my email and password to log in (so how can i log to my inbox from messenger directly?)