McAfee Site Advisor add on causes Firefox to operate slowly, wht can be done?

Running Win 8.1 on a new Dell.
McAfee Site advisor is enabled and causes Firefox to run slowly and in fits and starts.
When I disable Mcafee site advisor Firefox runs fine.

Hi Richard,
Unfortunately, extensions such as Site Advisor are known to slow-down Firefox. Often, poor memory utilization is the cause; this can lead to slow start-up, crashing, and general slowness loading webpages.
In my opinion, Site Advisor is completely unnecessary, as Firefox includes built-in phishing and malware protection already (see [[How does built-in Phishing and Malware Protection work?]])
In addition, some search engines such as duckduckgo.com have an option to enable Web of Trust (mywot.com) ratings alongside search results without the need for additional add-ons. In your case, I think this would be the best option for you.
See also:
* https://blog.mozilla.org/nnethercote/2012/02/17/the-mcafee-site-advisor-add-on-has-an-appalling-memory-leak/

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