Excellent Puntuado con 5 de 5 estrellas

I'm not sure why this is, but I have no issues with viewing PNG's now.
This is an excellent extension.
Thanks sincerely for developing it.

Esta valoración es de una versión anterior del complemento (0.41). 

Thumbs up Puntuado con 5 de 5 estrellas

Awesome work!

Esta valoración es de una versión anterior del complemento (0.41). 

Thank you for your comments.
I am so surprised that it does not support PNG in your firefox for I have test JPEG, PNG, GIF and BMP files in several computers and it seems to work fine here. So would you please give me more details about it? I will try to find the problem and fix it.