Do the following in all supported browsers: Dock the navblock and settings block Open the docked settings block Verify the height of the block is not excessive Start expanding nodes until there is no more vertical room for them - then expand some more Verify that a scrollbar is present and you can scroll up and down to view the nodes Start collapsing nodes until the tree fits in the viewport again Keep collapsing and verify the size of the block shrinks Repeat for the navigation block (you can resize the browser window height for this, since by default there are not that many items in the navigation tree) Undock the blocks and play around with them. Make sure they work as before