I was doing homework on masteringgenetics and there was this box in the top left hand corner that said to allow java deployment toolkit because some of the content on the website needed it so I clicked "always allow". This then took me to java's website to update java and I was gullible so I did. Now there are random ads on most websites I go to and if I stay on there it takes me to some random website. I've tried disabling all plugins, uninstalling java, uninstalling then reinstalling firefox, but it still happened. It doesn't happen when I use google chrome so I think it's a firefox thing (actually now it's happening on chrome too).