The only thing that has been very annoying for me in FF3 is the security certificates. Nearly ever site you visit that goes to a secure SHTTP url is instantly blocked from loading by FF3 due to "security certificates don't match", or "security certificates are out of date". Other browsers like Opera just throw up a requester box when this happens and you can select to allow or deny access to the site. But not FF. Instead it just locks you out. To gain access you have to go into the browser options, and then the advanced tab, and finally select to view certificates. Then you have to add an exception to the list for the site you are trying to visit. Very annoying and very unfriendly. They need to fix this in the next release. Even FF own plugins site gets blocked by a new FF3 installation. MAD!