Until the others days I tought that Monknown was the best one...
But I'm gad I found Tabliss, is way more elegant and usefull!!!

Очень красивые картинки

Highly recommend

A extensão é boa, personalizável, leve e estável. Além disso, sempre possui excelentes imagens para aqueles que gostam de imagens diferentes a cada dia.

This is the most stable extension in my collection. It's consistently updated with an eye to pleasing its users, easy to back up, and it is pleasant. It has also saved me a lot of time and energy when other things go wrong with unruly alternative versions of Firefox. It saved me today. Thank you devs of Tabliss. You are awesome.