Everything on firefox!!!

Hello,
I am having problems opening any email when using mozilla firefox! i am trying to access my emails in yahoo, msn, hotmail...etc. but nothing is working, it simply wont let me open the email....i can log in it just wont let me read or reply to anything...i thought it may be a script problem with the computer or maybe a link problem but not sure can you help please?
many thanks
Fizzle12