I have Windows 7, Firefox 4.0, and am trying F-Secure Internet security 2011 trial. My issue is when I am browsing, quite often when I am typing in the address bar or search bar nothing happens. I cannot highlight the text or anything. I have figured I have to wait about 10 seconds for it to clear. Or I can close the browser and reopen and it works.

This is annoying. Is this a Firefox issue or a F-Secure issue? I installed both 4.0 and the F-Secure trail at the same time.