I know these aren't real warnings, i know my mac isn't being invaded by little green digital men wanting to destroy my HD or whatever, but i am getting warnings continually more often popping up on my screen. They are like adverts, but as you will see from the screen shots ive taken, there is not little 'X' to press to get rid of it, i have to press cancel on the window, and sometimes there isn't even the option to do that. Does anyone recognise whats going on? When these warnings come up i end up having to close firefox and quit it, and then open it from scratch again. It's really starting to annoy me!! Anyway, this is what i see at various times: This happens first ... firefox window disappears, and this message come up: Then i get transfered to this page: Then when i try to navigate away from that page to anywhere else i get this before it the loads the new page: I get these messages from normal usage of the internet, they randomly appear and they are becoming more frequent.