I also think that the white background is harder to distinguish from the actual page.

I vote for the background to be the same color as Chrome's default tab bar. When I add a `bacground-color: #eee;` to Sidewise's CSS, it becomes perfect.

cmd+w (in Mac OS) still closes Sidewise.

The current version fixes 50% of the problem! It's becoming great and I think that now I can switch to Chrome.

When I point the mouse to Sidewise, it gets focus and I can click the tab only once to get to it. The only problem is that when I click the tab on sidewise, Chrome gets the focus. And then if I want to select another tab, I have to click Sidewise twice: once to get the focus and twice to actually click the tab's title.

It would be great if the focus followed the mouse no matter what. The focus should only go to Chrome if I hover its window.

Keep up the good work!

I think Karl Hendrikse explained exactly what the problem is. And that is the only thing that is preventing me to switch from FF+Tree Style Tabs to Chrome+Sidewise.