Shiira is a very nice browser but with one huge flaw—the decision to put the page thumbnails at the bottom of the window instead of the side. This is wrong for a couple of reasons. It forces you to scroll more since less information is displayed. You could make your window wider and regain the total area. However, computer screens are almost universally wider than they are tall which in itself is a problem because the readability of text is improved when the columns are rather narrow as opposed to being very wide. Wide columns force more eye travel and cause you to struggle to find the next line when returning to the left side of the column. I think that Shiira is a Japanese project so maybe they use tall screens whereby putting the thumbnails at the bottom makes sense. So maybe there should be an option to place the thumbnails. Omniweb is very successful with its thumbnails on the side (in a drawer).