Installed Firefox 4 on my Mac; getting error messages upon start up and when opening photos (i.e. ebay)

I updated to Firefox 4 and now continuously receive error messages. One example is when I'm in Ebay and click on a photo to enlarge I get the following error message.
(JavaScript Application)
can't create mcafee plug-in object: TypeError:
Components.classes(cid) is undefined
Another example is upon start up of Firefox I receive an error message but I can't make it out since its half hidden on my desktop but I have to click "ok" in order to open up Firefox.
I'm barely learning how to use this Mac (a task in its self), but now I have these error messages? Can I just go back to my older version of Firefox to make these error messages go away?
Thanks, JR.

Thank you very, very much. This was my very first time trying to solve a technical issue on my Mac... your advice worked great. I disabled all the add-on apps and it solved my issue. Don't know if I should have disabled all but it seemed to work... Thanks again for the advice.

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