Rated 5 out of 5 stars
This is a fantastically useful add-on, and so well implemented too! Very handy for any situation where I want to look at two pages side-by-side (which is why I looked for this in the first place).
Just one thing it would be nice to have is a way to change the arrangement of tiles within a layout, without having to remove and re-add tabs. At least, I can't find any way to do so.