For a very long time (since Firefox 4 or so), I get notified of updates, but when I tell it to update I just get a window that says it is downloading firefox, and it's connecting to the update server and it stays there forever. I've left it open for days and it never goes away. I've always had to go download a new copy to update, but I'd really like to get the auto update working.

I've tried deleting history/cache/etc forever. I've deleted everything from AppData related to Mozilla, which I lose everything, but still the software update gets stuck. It's obviously stuck doing something other than trying to connect to the update server. Any ideas?