On my facebook page my profile picture has disapeared along with all friends profile pictures, but only when I use firefox

If images are missing then check that you aren't blocking images from some domains. *Check the permissions for the domain in the current tab in "Tools > Page Info > Permissions" *Check that images are enabled: Tools > Options > Content: [X] Load images automatically *Check the exceptions in "Tools > Options > Content: Load Images > Exceptions" *Check the "Tools > Page Info > Media" tab for blocked images (scroll through all the images with the cursor Down key). If an image in the list is grayed and there is a check-mark in the box "<i>Block Images from...</i>" then remove that mark to unblock the images from that domain. There are also extensions (Tools > Add-ons > Extensions) and security software (firewall, anti-virus) that can block images.