Well, the link you provided led me in the right direction to solving the problem, it was down to permissions in Firefox. Thanks so much, You saved the day as far as FB is concerned. I was going to reply on the Mozilla forum post but it's archived. I'll see if there's another post perhaps and let anyone else suffering from this know the good news. It's important to make sure 'Site Preferences' is un-selected when deleting temporary internet files. Thanks again.