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

Disable Sitadvisor, it's useless anyway.

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/