[Watabou]

You can view images on iTerm 2:

https://db.tt/nO3P7yO6

And yes, iTerm2 also displays animated gifs.

[dekz]

What is displaying your "tabs" at the bottom of your terminal?

[Watabou]

Yep as steckerbrett mentioned, it's the new Dark style tabs introduced in iTerm nightlies, which you can put it in the bottom. It might be included now in the betas or the stable version, not sure.

[steckerbrett]

That's part of iTerm. In appearance, set tab style "bottom" and "dark" to emulate that screenshot.