By Stewart MitchellPosted on 27 Oct 2010 at 10:59Mozilla has warned about a critical zero-day vulnerability affecting Firefox 3.5 and Firefox 3.6 users. “We have received reports from several security research firms that have found exploit code leveraging this vulnerability in the wild,” Mozilla said on its security blog.According to Mozilla, the problem first surfaced on the Nobel Peace Prize website. Access to that site has now been blocked, but the browser developer warned that other sites could be infected and said “users who visited an infected site could have been affected by the malware”.