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/