Hi DavidR,
I was not talking about holes or vulnerabilities, but further down on that page there is a number of malware mentioned, specifically aimed at the FF browser like there are for instance: JS FFSNIFF.A, Win32/Nebuler Family (Saw that just recently in the virus & worms), Win32/TibickA, Trojan.Haradong (saw that under an alias also in that forum sector) etc. etc.
Now it is important that users of these browsers (FF and Flock alike) use the in-browser protection measures like NoScript, enable/disable Flash, Distrust, TrustWatch by Geotrust or MacAfeeSiteAdvisor, DrWeb anti virus link checker, Avast Webshield inside the FF or Flock browser, Netcraft toolbar just to mention the most vital for prevention against the common infection vectors. Also in combination with the usual ad- & spyware preventing programs (Ad-Aware, Spybot S&D, SpywareBlaster) FF can be called rather secure.
polonus