Rated 2 out of 5 stars

I have to agree with other reviews.
This theme is simply the best. Actually it WOULD be the best.
The icons are right size, shape, color. Everything is functional and perfect for professional use.
I say WOULD as this theme is clearly unmaintained since 2013.
A real pity, after upgrade to 45.2 on Linux the mailbox name text in the mailbox column, when it is not active, is gray and gray, so it is unreadable.
And as others wrote, the close tab X is not displayed.
This could be fixed super easily, had the theme been maintained. I hope someone takes over, because I love this theme.

This review is for a previous version of the add-on (1.3.0).