Rated 4 out of 5 stars

Would be nice to have rounded tabs, other than that great addon.

This review is for a previous version of the add-on (10). 

Thanks for the review.

Concerning tabs, as explained to another user, I wanted to keep my design as it was before Firefox 29. It is part of FT DeepDark identity and I did all my best to keep it as it is.
By the way, I am not fan of the new "Australis" rounded tabs, but it is not the main reason why I didn't add these curves into my design.