Facebook page won't load

Hello,

Last night i used facebook and it worked normally but today in the morning i logged in and i couldnt see my home page, my profile, my msg or my friends' wall. However i can see the notification and my account. i tried from my brother's laptop and it worked. i used internet explorer and it worked there too. i just can't see those from firefox. However my yahoo mail and others are working normal.
i tried to use 's' and it worked but now have to add the 's' to http to get onto any Facebook page. whenever i'm trying to go home page to profile always i have to put 's' which is really disturbing.
is there any way to solve the problem. please help me with it