This is not so much a problem but a fix before you have the problem!
I regularly install the Mcafee SiteAdvisor add-on to Firefox in my Ubuntu installations. I have just gone to install Siteadvisor from http://www.siteadvisor.com and it offered me the Windows add-on via an .exe file. I looked around for the Linux download with no luck. I can only assume that Mcafee has recently changed its policy on Linux add-ons as I was able to download it a week or so ago!
HOWEVER if you are in the same situation do not despair. Go to:
http://www.siteadvisor.com/download/mac.html
and accept the Mac OS X download. This is a Firefox add-on (rather than an executable) and Firefox takes care of installing it.
I hope this helps.
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