Hi Kate
Tbh I don't use that many..I have McAfee Site Advisor,WOT,Hotmail checker,Gmail Checker,Picasa,Google dictionary and screen Capture
McAfee SA sits inside the Address bar and all the others are to the right in between the address bar and the spanner icon.Never had any problems.
Click on the spanner icon>Options>under the hood>Privacy
Have you got the 'automatically send usage to Google' box ticked by any chance