Two close buttons (left & right) when 1 tab only Puntuado con 4 de 5 estrellas

When there is only one tab, this tab has two close buttons (left & right)

http://h9.abload.de/img/2closetabszkxf2.jpg

Esta valoración es de una versión anterior del complemento (0.4.0.1-signed). 

report about this to our forum
http://tmp.garyr.net/forum/

post more information, about tour operation system, theme, Firefox version. test if you see the same on clean profile with only Tabmix installed