Doesn't work with TB60 due to something TB did yet for some reason people think that entitles them to write negative reviews. I've used this theme for so long I have no memory of when I started. I can only think it must have been around the time I upgraded to TB4 and immediately found TB completely unusable. This theme is the only thing that makes Thunderbird usable for me as the default makes it impossible to see which folders have new messages. I'll be patiently waiting for a solution or stop using ThunderBird altogether if it turns out not to be possible.