GOOGLE and many other websites 
grab your mouse pointer and screw up 
where you are typing or clicking ,,,
they call it  stealing "focus" 

I CALL THIS CRAP!

start firefox
In the address bar type ' about:config ' [filter] type ' dom.disable_window_open_feature. ' set all = true by double left click , [close]
next click [tools] [options] [content] to the right of "Enable JavaScript" click [advanced] uncheck [raise or lower windows] [ok] [ok]
firefox3 intentionaly hides this setting!. so search for prefs.js & user.js , YOUR javascript OVERRIDE files in c:\program files\mozilla\firefox\ or c:\documents and settings\your login name\ right click the files and select [open with] uncheck [allways use the selected ,,,,] ,select notepad look inside for the lines that start with user_pref at the top of that line, add the following line user_pref("capability.policy.default.HTMLInputElement.focus", "noAccess"); if you do not find user_pref then close that file and look in the next js OVERRIDE file in the search list
C:\google stole my focus>cd.._