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MCafee Site Advisor was incompatible with Firefox 5.0. I cannot enable it and would like to return to Firefox 4.1. How do i do that?

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I was advised that Firefox could not find a compatible McAfee Site Adviser Plug in that was compatible and would therefore like to revert to Firefox 4.1 as it was before I updated. Until then I will make Internet Explorer my default browser. I loved Firefox 4.1 with the site adviser and would have kept it as my default browser.

I was advised that Firefox could not find a compatible McAfee Site Adviser Plug in that was compatible and would therefore like to revert to Firefox 4.1 as it was before I updated. Until then I will make Internet Explorer my default browser. I loved Firefox 4.1 with the site adviser and would have kept it as my default browser.

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Blocked by Mozilla due to an excessive number of crashes it was causing. McAfee id re-writing that add-on to fix the problems.
https://bugzilla.mozilla.org/show_bug.cgi?id=660111