though my firefox is the latest, I am told it is too old and needs to be upgraded
Some websites tell me I need to upgrade, but my browser is 9.0.1 for mac
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Your user agent is corrupted by Fast Browser Search (FBSMTWB) and that identifies you as Firefox/3.5.5
see your user agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 FBSMTWB
reset user agent and you have no more problem
see also these pages and threads about Fast Browser Search (FBSMTWB in the user agent).
http://help.fastbrowsersearch.com/
http://www.pccybertek.com/2009/05/remove-fast-browser-search
thank you
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