Rated 5 out of 5 stars

Awesome! (FF3.6.16) Sometimes the synchronous scrolling doesn't work and sometimes I will accidentally click on the little shortcut arrow and split the window when I didn't mean to, but all windows are very easily reset to normal with just 2 clicks of the mouse. This add on has proved very useful and is one of the many reasons I never use IE or any other browser other than FF