I'm no expert but I believe you may have some kind of malware which is telling your browser to load infected websites. I doubt this is related to chess.com.
HEUR:Trojan
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This Morning I went to click on Opening experts Vs Endgame experts, as i clicked the No.-2 to look at other comments my virus scanner reported the website was trying to run 3 torjans. 13/02/2010 06:22:06 http://alarismeta.com/?q=ytsr&zc=2&qsrc=19&b=di&id=10025004&sitid=37811770&wh=72890&ar=qij15vz Firefox Detected: HEUR:Trojan.Script.Iframer
does any1 know why ?