I have a brand new I-mac and just recently added Mozilla Firefox to my browsers. I get a notice that a security update is available. When I select update, it say "connecting to update server", but it just stays on that place and never downloads the update. I can wait 5 or 6 minutes and it keeps saying "connecting to update server" but nothing else happens. I am new to Apple after saying farewell to my 8 year old Dell P.C., so everything is new to me. Is something blocking the update? I never had this problem when I used Firefox on my P.C. and since I love it as a primary browser, I want to keep everything up to date.