WilliamKidd, thanks for your reply. Yes, I meant the balloons. I followed the link you gave and read that it cannot be disabled, unfortunately.
My reason for wanting to disable the balloons is that I don't type blindly, and the balloons sometimes remove the focus from the edit box where I want to type. When googling, I will put the cursor in the search box, move my eyes to the keyboard and start typing. For unclear reasons a Siteadvisor balloon sometimes appears 'spontaneously' (perhaps because I move the cursor away over the green McAfee logo below the search box of the Google bar), with a small delay, removing the focus from the search box. So when ready with typing I discover that the search box is still empty. I admit it is my own clumsyness that I don't type blindly, but that's why I don't like the SiteAdvisor balloons.
And less important: in my opinion the balloons are too big, too obtrusive, too much clutter, and too self promotional. Most sites are ok; I would like Siteadvisor too be silent about them instead of those balloons.