Hotmail and Firefox

[wsb1]

I started using Firefox and like it very much, however my hotmail has some problems. I get all my email it's just that the screen is missing some of the clickable arrows, to go to the next email or to delete an email. Anything that is clickable doesn't show on the screen. Is there a fix for this? They all work if I click over the area they are supposed to be in, just can't see them.