This is so much better than the default theme.

I was looking for a nice theme that easily showed the tabs as it used to before the browser update. I think this looks really good. This theme reminded me of the original look (at least nicer to look at than where your tabs all blend together.) This will most likely be my go-to theme because it's nice on the eyes. I've also noticed some other themes make the text of your tabs and bookmarks bar a bit blurred or not as easy to read. This one is very clear.
Edit: I did notice it's hard to see the + for the tabs at the top. If you could make it a bit lighter or white, that would be perfect. Thanks!