which has the highest detection rate in this two??
mcafee siteadvisor or finjan secure browsing
I use them both. 
Hi źђєкє°¹,
I like the combination of finjan and WOT together with the DrWeb av-link checker add-on for Fx.
I left McAfee Siteadvisor after it started to launch messages (only have it in IE7). I also like to have scandoo.com installed as search engine, it sort of does the same. Then since Fx 3.0 RC2 the browser uses the Google blacklist for inbuilt security, the Yahoo bar has MacAfee security built in, so that would be overkill anyway.
As ANTI-malware in-built browser protection I additionally use NoScript the best add-on that was ever developed ever by Mr. Giorgio Maone. Then the SafeHistory and SafeCache add-ons against tracking and BetterPrivacy add-on against hidden super cookie tracking and ping tracking. Together with cleansing the cache regularly, I have taken this browser back into my own hands more or less, because the developers over recent years have been working just the other way (profiling, tracking, clickstream selling, etc. etc.) selling out to the trackers, adware sellers, and other commercial lurers. Hope this will help you, else go toi MozillaZine and look for my postings there (under another nick) in the MozillaZine webforums (luntrus),
polonus aka luntrus aka Damian