Rated 2 out of 5 stars
Basically a very good and useful idea which should be really improved though... :-(
I really tried to use it and I invested a lot of time to test and try to understand all the problems the present version (0.5.2008101801) is creating. I had to come to the conclusion that it's definitely not a mature add-on at present but it could become if the developper takes the time to continue the started work. I wish it!
2 examples of bugs: the option "show split options if the shift key is pressed is not working" since the button still always continue to shop up automatically when one edge of the content area is pointed to. If a new window is opened after having clicked on a java script based link and this new window is splitted then it becomes impossible to close the split again since the whole toolbar is missing...