After updating Brave Browser to v1.87.186, I noticed the new tabs appearances are not different. For me, the logo is outlined, making it hard to recognize from a far. I think this should either be undone or a setting that could be changed (e.g. hollow, not hollow, colours…).
Here is an example of what it looks like (you’ll notice if you make it really small, it is hard to tell what it is):
I think the dark mode favicon should be the same as the light mode favicon, just with inverted colours (in dark mode, it should be white), instead of an outline.